Patent Publication Number: US-10782880-B2

Title: Apparatus and method for providing storage for providing cloud services

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of Korean Patent Application No. 10-2017-0109957, filed Aug. 30, 2017, No. 10-2017-0137712, filed Oct. 23, 2017, No. 10-2018-0054966, filed May 14, 2018, and No. 10-2018-0054951, filed May 14, 2018, which are hereby incorporated by reference in their entirety into this application. 
     BACKGROUND OF THE INVENTION 
     1. Technical Field 
     The present invention relates generally to cloud-computing technology, and more particularly to a storage integration method for combining cloud storage and non-cloud storage. 
     2. Description of the Related Art 
     These days, the development of technology for cloud computing, which enables a user to use a desired service without restrictions as to time and place, is accelerated, and market demand therefor continues to increase. Cloud computing may provide network, storage, and computing services desired by users using the Internet, without the need to provide hardware and software for each user. 
     In the case of a storage system related to a data storage service, among cloud-computing techniques, a user may request to store data using a secure and convenient service interface provided by the system. In this regard, a cloud-integrated storage system that stores data in cloud-integrated storage that appears as a single storage space even though both on-premises storage and public cloud storage are integrated therein has been developed. 
     Particularly, the cloud-integrated storage system may manage and operate on-premises public storage that appears as a single storage space while making use of the advantages both of on-premises storage possessed by companies and organizations and of public cloud storage provided by a cloud provider. 
     Using on-premises public storage appearing as a single storage space, the cloud-integrated storage system may provide a converged storage infrastructure service that secures the flexibility and cost efficiencies of a storage space and guarantees reliability and control over sensitive data. 
     Accordingly, the cloud-integrated storage system may extend the use of cloud services to various fields and use the cloud services in order to create new business models. 
     Trends of existing similar systems are as follows. 
     In order to support operations for ‘IDC&#39;s 3rd Platform’, for example, real-time analysis, IoT, AI computing, and the like, there is a strong demand to construct and adopt a hybrid cloud-computing service. 
     Also, IDC&#39;s 3rd Platform aims to support the extension of computing resources by unifying various cloud models and to improve automation and computing environment management efficiency. 
     HP provides infrastructure management functions using a RESTful API based on OpenStack and provides a Helion Eucalyptus platform, which is open-source software designed to be compatible with Amazon Web Services (AWS). 
     VMware launched vCloud Hybrid Service (vCHS), which provides virtualization of servers, storage, and networking in an integrated manner based on existing virtualization solutions and infrastructure of VMware. 
     Rackspace focuses on the extension of cloud infrastructure and integrates a cloud server with an enterprise Storage Area Network (SAN). Also, Rackspace supports data protection by deploying Cisco ASA firewalls. 
     Avere FlashCloud of Avere Systems and StorSimple of Microsoft have cloud storage gateway capabilities for storage tiering, based on which data is stored in local or cloud storage depending on the frequency of use of the data, in order to provide data backup, archiving, and applications for a tier  2  level, as well as a disaster recovery service. 
     Data replication for storing the same data in both local storage and public storage may be performed through copying in a cloud storage gateway, and a cloud storage gateway solution of CTERA Networks is a representative example thereof. The solution additionally provides file distribution, synchronization and sharing services. 
     Meanwhile, Korean Patent No. 10-1212778, titled “Cloud-computing-based smart office system and server and method for operating the same”, discloses a smart office system, including a cloud-based mobile web server and an on-premises mobile web server, and a server and method for operating the smart office system. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to improve the performance of read/write operations in integrated storage that combines cloud storage and on-premises storage. 
     Another object of the present invention is to enable cloud storage and on-premises storage included in integrated storage to provide a data storage service with the same performance. 
     A further object of the present invention is to move data of a user based on the flexibility of a storage space and cost efficiencies. 
     Yet another object of the present invention is to support various types of cloud storage services, such as Amazon S3, Microsoft Azure, and the like, thereby providing an integrated storage service that meets user requirements. 
     Still another object of the present invention is to enable data in cloud storage to be accessed at a speed close to the speed at which data in on-premises storage is accessed. 
     Still another object of the present invention is to provide a service interface through which a user may access cloud-integrated storage using various service protocols. 
     Still another object of the present invention is to provide various types of storage services, such as a storage service for storing conventional files or data blocks, a storage service for storing objects, which has recently come to be provided by cloud storage providers, and the like. 
     Still another object of the present invention is to guarantee secure data transfer between on-premises storage and cloud storage, thereby guaranteeing the confidentiality of user data. 
     Still another object of the present invention is to prevent data loss caused due to system errors. 
     Still another object of the present invention is to provide a multi-tenant function for simultaneously performing multiple cloud services. 
     In order to accomplish the above objects, an apparatus for providing storage for providing a cloud service according to an embodiment of the present invention includes a data distribution and storage unit for distributing data in order to store the data in integrated storage, including on-premises storage and cloud storage; a backend storage management unit for connecting to the integrated storage in order to store the data and providing information about storage tiering pertaining to the data; a data manipulation unit for providing the integrated storage as virtual data storage regardless of a location at which the data is actually stored; and a storage connection unit for providing a user with an interface for the virtual data storage as a single virtual storage unit. 
     Here, the data distribution and storage unit may minimize time taken to write and access data by optimizing the data to be written to the integrated storage, and may perform compression or encryption of the data. 
     Here, the data manipulation unit may provide a write buffer function or a read cache function for the data and decrease a response time of a write operation or a read operation for the data using high-speed storage. 
     Here, the apparatus may further include a provisioning and policy management unit for providing metadata for storing and distributing the data, and the metadata may include first metadata for data operations and second metadata for storage operations. 
     Also, in order to accomplish the above objects, a method for providing storage for providing a cloud service, performed by an apparatus for providing storage for providing a cloud service, according to an embodiment of the present invention includes distributing data in order to store the data in integrated storage, including on-premises storage and cloud storage; and managing the data by providing the integrated storage as virtual data storage regardless of a location at which the data is actually stored and by providing a user with an interface for the virtual data storage as a single virtual storage unit. 
     Here, managing the data may include connecting to the integrated storage in order to store the data, and providing information about storage tiering pertaining to the data. 
     Here, distributing the data may be configured to minimize time taken to write and access data by optimizing the data to be written to the integrated storage; and to perform compression or encryption of the data. 
     Here, managing the data may be configured to provide a write buffer function or a read cache function for the data and to decrease a response time of a write operation or a read operation for the data using high-speed storage. 
     Here, the method may further include performing provisioning by providing metadata for storing and distributing the data, and the metadata may include first metadata for data operations and second metadata for storage operations. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a block diagram that shows an integrated storage system according to an embodiment of the present invention; 
         FIG. 2  is a block diagram that shows an apparatus for providing storage for providing a cloud service according to an embodiment of the present invention; 
         FIG. 3  is a block diagram that specifically shows an example of the storage connection unit illustrated in  FIG. 2 ; 
         FIG. 4  is a block diagram that specifically shows an example of the data manipulation unit illustrated in  FIG. 2 ; 
         FIG. 5  is a view that shows an example of a RAM disk according to an embodiment of the present invention; 
         FIG. 6  is a view that specifically shows the operations of a data distribution and storage unit and a backend storage management unit according to an embodiment of the present invention; 
         FIG. 7  is a flowchart that shows a method for providing storage for providing a cloud service according to an embodiment of the present invention; 
         FIG. 8  is a view that shows the relationship between a service provider and an apparatus for providing storage for providing a cloud service according to an embodiment of the present invention; 
         FIG. 9  is a flowchart that shows a storage provision method for registering a storage service according to an embodiment of the present invention; 
         FIG. 10  is a block diagram that shows an apparatus for providing storage for providing a cloud service according to an embodiment of the present invention; 
         FIG. 11  is a block diagram that shows an apparatus for providing storage for providing a cloud service using a backend connection daemon according to an embodiment of the present invention; 
         FIG. 12  is a flowchart that shows a method for providing storage according to an embodiment of the present invention; and 
         FIG. 13  is a block diagram that shows a computer system according to an embodiment of the present invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention will be described in detail below with reference to the accompanying drawings. Repeated descriptions and descriptions of known functions and configurations which have been deemed to unnecessarily obscure the gist of the present invention will be omitted below. The embodiments of the present invention are intended to fully describe the present invention to a person having ordinary knowledge in the art to which the present invention pertains. Accordingly, the shapes, sizes, etc. of components in the drawings may be exaggerated in order to make the description clearer. 
     Throughout this specification, the terms “comprises” and/or “comprising” and “includes” and/or “including” specify the presence of stated elements but do not preclude the presence or addition of one or more other elements unless otherwise specified. 
     Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. 
       FIG. 1  is a block diagram that shows an integrated storage system according to an embodiment of the present invention. 
     Referring to  FIG. 1 , an integrated storage system according to an embodiment of the present invention may include a user client device  10 , a storage provision apparatus  100  for providing a cloud service, and integrated storage  20 . 
     The user client device  10  enables a user to request and receive the service of the integrated storage  20  using the storage provision apparatus  100 . 
     The integrated storage may include cloud storage  21  and non-cloud storage  22 . 
     The cloud storage  21  may be public cloud storage provided by a cloud provider. 
     The non-cloud storage  22  may be on-premises storage possessed by companies and organizations. 
     The storage provision apparatus  100  may manage and operate the cloud storage  21  and the non-cloud storage  22  included in the integrated storage  20  as unified storage. 
     Here, the storage provision apparatus  100  may provide a cloud service with consistent performance so that a user may not be able to distinguish access to the cloud storage  21  from access to the non-cloud storage  22 . 
       FIG. 2  is a block diagram that shows an apparatus for providing storage for providing a cloud service according to an embodiment of the present invention.  FIG. 3  is a block diagram that specifically shows an example of the storage connection unit illustrated in  FIG. 2 .  FIG. 4  is a block diagram that specifically shows an example of the data manipulation unit illustrated in  FIG. 2 . 
     Referring to  FIG. 2 , the apparatus  100  for providing storage for providing a cloud service according to an embodiment of the present invention includes a storage connection unit  110 , a data manipulation unit  120 , a data distribution and storage unit  130 , a backend storage management unit  140 , and a provisioning and policy management unit  150 . 
     The storage connection unit  110  may provide the service of the integrated storage  20  to a user by operating in conjunction with the integrated storage  20 . 
     Referring to  FIG. 3 , the storage connection unit  110  may include a virtual block device service engine  111 , a file-system service engine  112 , and an object storage service engine  113 . 
     Here, the storage connection unit  110  may process the protocols of block storage, file storage, and object storage and may provide an I/O interface and an acceleration function for improving processing of the protocols. 
     Here, the storage connection unit  110  may basically provide a user with block device and file system services, which are conventional storage service interfaces, and may also provide an object storage interface that has recently emerged. 
     The data manipulation unit  120  may provide a single storage view of the entire storage system by providing a virtual disk pool to a user. 
     That is, the data manipulation unit  120  may form a virtual disk pool using a fast storage resource, and may provide a user with storage devices as a virtual disk. 
     Here, the data manipulation unit  120  may provide the integrated storage  20  as virtual data storage regardless of the location at which data is actually stored. 
     Here, the storage connection unit  110  may provide a user with an interface for the virtual data storage as a single virtual storage unit. 
     Therefore, even though data is physically distributed across various types of storage, a user may be provided with a single storage configuration regardless of the location at which the data is actually stored. 
     The data manipulation unit  120  may provide at least one of a write buffer function and a read cache function for data and may improve the response time of read and write operations for the data using high-speed storage. 
     Here, the data manipulation unit  120  may provide data management functions, such as snapshots, fast replication, a distributed transaction log, and the like. 
     Here, the data manipulation unit  120  may provide a write buffer function or a read cache function to a user when a data write operation or a data read operation is performed. 
     Here, the data manipulation unit  120  may use memory, a Solid-State Drive (SSD), and a PCIe flash card to guarantee a fast response time to a user. 
     Here, the data manipulation unit  120  may provide a read/write cache for data using a RAM disk in order to provide the service of the integrated storage. 
     The data manipulation unit  120  may provide the function of caching the data stored in public cloud storage, which is the cloud storage  21 . Because data stored in the public cloud storage is transferred using an Internet network, the data access speed is slower than that of on-premises storage, which is the non-cloud storage  22 . 
     Also, because data is automatically distributed across public cloud storage in the state in which a user cannot recognize the distribution of the data, a function for quickly accessing data stored in the public cloud storage is required. 
     The data manipulation unit  120  caches data stored in the public cloud storage to a storage device within the cloud-integrated storage operating platform, whereby the data in the public cloud storage may be accessed at a speed close to the speed at which data in the on-premises storage is accessed. 
     Referring to  FIG. 4 , the data manipulation unit  120  may include an in-memory namespace block  121 , a read cache unit  122 , a write cache unit  123 , an in-memory deduplication engine  124 , and an in-memory data compression engine  125 . 
     The in-memory namespace block  121  may store information that is periodically and repeatedly read and written in order to access actual data, and may guarantee high access speed. 
     Here, the in-memory namespace block  121  stores information that is necessary for access to data in high-speed main memory, thereby providing the function of storing and managing the data. 
     Here, the in-memory namespace block  121  is a volatile storage medium and has a limited capacity. Therefore, the namespace block is backed up in real time, and the namespace block that is backed up may provide high availability through clustering of multiple nodes (virtual machines or physical servers). 
     Here, in order to provide fast performance of the integrated storage, the data manipulation unit  120  may use the in-memory namespace block  121  and run both the in-memory deduplication engine  124  and the in-memory data compression engine  125 , which reduce the amount of data, in the in-memory block. 
     Here, the data manipulation unit  120  is required to guarantee a high speed when a global namespace for accessing actual data is accessed, and may provide a high-speed processing method in order to quickly write and read data. 
     Each of the read cache unit  122  and the write cache unit  123  is in the form of a RAM disk, and may be configured as a single disk, which includes RAM, corresponding to main memory, and a Solid-State Drive (SSD). 
     The read cache unit  122  and the write cache unit  123  may back up data in real time in the SSD because the RAM is volatile. 
     Here, when the RAM-based cache area is exhausted, the read cache unit  122  and the write cache unit  123  may automatically make the SSD-based cache area replace the RAM-based cache area. 
     Here, when a user writes data, the read cache unit  122  and the write cache unit  123  may return a result immediately after writing the data in a memory area for a fast response thereto. 
     The in-memory deduplication engine  124  and the in-memory data compression engine  125  may correspond to the data distribution and storage unit  130 , which will be described later. 
     That is, the data distribution and storage unit  130  may be included in the data manipulation unit  120 . 
     The in-memory deduplication engine  124  may provide the function of storing data in multiple physical devices in a distributed manner in order to prevent data loss. 
     Here, the in-memory deduplication engine  124  applies error detection and recovery code for detecting the occurrence of errors in data and correcting the errors, thereby responding to data and system errors. 
     The in-memory data compression engine  125  compresses actual data to be stored in the backend storage, thereby reducing the size of the data. Particularly, the in-memory data compression engine  125  reduces the size of the data to be stored in the public cloud storage through compression, thereby reducing the size of the data to be transferred over a network. 
     The data distribution and storage unit  130  may distribute data in order to store the data in the integrated storage  20 , which includes the on-premises storage and the cloud storage. 
     Here, the data distribution and storage unit  130  may provide an optimization function for the received data to be written such that the data may always be accessed with the minimum overhead. 
     Here, the data distribution and storage unit  130  optimizes the data to be written in the integrated storage  20  in order to minimize the time taken to write and access the data, and may perform at least one of compression and encryption of the data. 
     Here, the data distribution and storage unit  130  partitions each object into multiple segments in order to efficiently manage data, and may store the partitioned segments in another node or a data center in a distributed manner in order to improve reliability. 
     Here, the data distribution and storage unit  130  may optionally encrypt or compress the partitioned segments and enact a policy decision therefor. 
     Here, the data distribution and storage unit  130  applies error detection and recovery code for detecting the occurrence of errors in data and correcting the errors, thereby responding to data and system errors. 
     The backend storage management unit  140  may provide a storage interface of the cloud storage  21  and the non-cloud storage  22  in order to store data created in the data distribution and storage unit  130  in the final resource. 
     Here, the backend storage management unit  140  may be connected with the integrated storage in order to store data and provide information about storage tiering pertaining to the data to be stored. 
     Here, the backend storage management unit  140  may provide the function of automatically or manually storing data using storage tiering based on performance, time, and the frequency of use according to the policy of a distributed storage hierarchy. 
     Here, the backend storage management unit  140  may provide the function of automatically distributing and storing data in various storage tiers. 
     Here, the backend storage management unit  140  may tier various types of storage based on the characteristics of the provided storage. 
     Here, the backend storage management unit  140  may initially store created data in high-speed storage, move the data to a lower tier of storage when the data is less frequently accessed, and finally store the data in the public cloud storage. 
     Here, the backend storage management unit  140  may automatically move data between various tiers of storage depending on the characteristics of the data. 
     The provisioning and policy management unit  150  may manage the respective tiers and a user-based policy. Here, the provisioning and policy management unit  150  may provide a hierarchical interface for disk provisioning requested by a user. 
     Here, the provisioning and policy management unit  150  may provide metadata for storing and distributing data. 
     Here, the metadata may include first metadata for data operations and second metadata for storage operations. 
     Here, the metadata is necessary in order to manage and access the data stored in the backend storage. The metadata of the present invention may be created when a user uses the client device  10 , or client metadata for an interface between the user client device  10  and the integrated-cloud management device, data management metadata that is necessary for data manipulation, and storage management metadata for backend storage may be used. 
       FIG. 5  is a view that shows an example of a RAM disk according to an embodiment of the present invention. 
     Referring to  FIG. 5 , the read cache unit  122  and the write cache unit  123 , which are the RAM disk of the data manipulation unit  120 , are specifically illustrated. 
     The read cache unit  122  distributes data as multiple pieces of block data depending on hashes using a data deduplication engine  122   a.    
     The write cache unit  123  manages a log for data recovery in the same node or another node connected therewith over a network using a data transaction log unit  123   a  in preparation for the case in which data stored in a write cache is lost due to system errors. 
     A log may save the location of data in a certain block and the hash value thereof, and may be maintained until the data is stored in backend storage. 
     The write cache may be synchronized with the transaction log node when a log queue reaches a certain size or a certain time is exceeded, or whenever data is generated in response to a request to write the data. The block located in the write cache may be replicated to the transaction log node under a certain condition. When data in the corresponding block is stored in the backend storage, the block in the write cache and the block in the transaction log node may be deleted therefrom because the data is removed from data to be managed. 
       FIG. 6  is a view that specifically shows the operations of a data distribution and storage unit and a backend storage management unit according to an embodiment of the present invention. 
     Referring to  FIG. 6 , the data compression block  131  of the data distribution and storage unit  130  compresses the actual data to be stored in the backend storage, thereby reducing the size of the data. Particularly, the data compression block  131  reduces the size of the data to be stored in the public cloud storage through compression, thereby reducing the size of the data to be transferred over a network. 
     The data distribution block  132  may provide the function of storing data in multiple physical devices in a distributed manner in order to prevent data loss. 
     Here, the data distribution block  132  applies error detection and recovery code for detecting the occurrence of errors in data and correcting the errors, thereby responding to data and system errors. 
     The backend storage management unit  140  may include a Hard Disk Drive (HDD), Serial Attached SCSI (SAS) storage, iSCSI storage, public cloud storage, and the like, and may provide an interface for finally storing data in the backend storage. 
     Here, the backend storage management unit  140  uses various types of storage, ranging from memory storage for guaranteeing fast response time to cloud storage for managing a large volume of data, through a data distribution strategy, a parallel I/O engine, and a multi-path I/O engine, thereby providing a high-availability service related to the connected storage and data management. 
     Here, the backend storage management unit  140  may store data in storage in the same node or storage in multiple nodes configured as a cluster such that the data is distributed, and may adjust the data size and the number of nodes across which the data is distributed, whereby data loss caused by system errors may be prevented. 
     The backend storage management unit  140  provides the function of automatically distributing and storing data in various tiers of storage. Here, based on the characteristics of the provided storage, various types of storage may be tiered. Initially, created data is stored in high-speed storage, data is moved to a lower tier of storage when the data is less frequently accessed, and the data is finally stored in the public cloud storage. The backend storage management unit  140  may automatically move data between various tiers of storage depending on the characteristics of the data. 
       FIG. 7  is a flowchart that shows a method for providing storage for providing a cloud service according to an embodiment of the present invention. 
     Referring to  FIG. 7 , in the method for providing storage for providing a cloud service according to an embodiment of the present invention, first, data may be accessed at step S 210 . 
     That is, data may be accessed at step S 210  in order to provide the service of integrated storage  20 . 
     Here, at step S 210 , a virtual disk pool is provided to a user, whereby a single storage view of the entire storage system may be provided. 
     Here, at step S 210 , the integrated storage  20  is provided as virtual data storage regardless of the location at which data is actually stored, and an interface for the virtual data storage as a single virtual storage unit may be provided to a user. 
     In the method for providing storage for providing a cloud service according to an embodiment of the present invention, data may be read or written at step S 220 . 
     That is, at step S 220 , a read/write cache for data may be provided using a RAM disk in order to provide the service of the integrated storage. 
     Here, at step S 220 , at least one of a write buffer function and a read cache function for data is provided, and the response time of write and read operations for the data may be improved using high-speed storage. 
     Here, at step S 220 , data stored in the public cloud storage is cached to a storage device within the cloud-integrated storage operating platform, whereby the data in the public cloud storage may be accessed at a speed close to the speed at which data in on-premises storage is accessed. 
     Here, at step S 220 , data read and write operations are performed using a RAM disk configured as a single disk, which includes RAM, corresponding to main memory, and an SSD. Here, when the RAM-based cache area is exhausted, the SSD-based cache area may automatically replace the RAM-based cache area. 
     In the method for providing storage according to an embodiment of the present invention, data may be distributed and stored at step S 230 . 
     That is, at step S 230 , the object of the data may be distributed and stored, and the distributed object may be encrypted and compressed. 
     Here, at step S 230 , error detection and recovery code for detecting the occurrence of errors in data and correcting the errors is applied, whereby it is possible to respond to data and system errors. 
     Here, at step S 230 , data may be distributed in order to store the data in the integrated storage  20 , including the on-premises storage and the cloud storage. 
     Here, at step S 230 , the received data to be written may be optimized such that the data may always be accessed with the minimum overhead. 
     Here, at step S 230 , the data to be written to the integrated storage  20  is optimized in order to minimize the time taken to write and access the data. To this end, at least one of compression and encryption of the data may be performed. 
     Here, at step S 230 , each object is partitioned into multiple segments in order to efficiently manage data, and the partitioned segments may be stored in another node or a data center in a distributed manner in order to improve reliability. 
     Here, at step S 230 , the partitioned segments may be optionally encrypted or compressed, and a policy decision therefor may be reflected. 
     In the method for providing storage according to an embodiment of the present invention, data may be stored in the final resource at step S 240 . 
     That is, at step S 240 , the final data created at step S 230  may be stored in the final resource. 
     Here, at step S 240 , the integrated storage is connected in order to store the data, and information about storage tiering pertaining to the data to be stored may be provided. 
     Here, at step S 240 , the function of automatically or manually storing data may be provided using storage tiering based on performance, time, and the frequency of use according to the policy of a distributed storage hierarchy. 
     Here, at step S 240 , the function of automatically distributing and storing data in various tiers of storage may be provided. 
     Here, at step S 240 , various types of storage may be tiered based on the characteristics of the provided storage. 
     Here, at step S 240 , created data is initially stored in high-speed storage, the data is moved to a lower tier of storage when the data is less frequently accessed, and the data may be finally stored in the public cloud storage. 
     Here, at step S 240 , data may be automatically moved between various tiers of storage depending on the characteristics of the data. 
       FIG. 8  is a view that shows the relationship between a service provider and an apparatus for providing storage according to an embodiment of the present invention. 
     Referring to  FIG. 8 , the storage provision apparatus  100  according to an embodiment of the present invention may enable multiple Distributed File System (DFS) service providers to register their data storage services A to N in the storage provision apparatus  100 . 
     Here, a DFS service administrator may provide the registered multiple storage services to users through the storage provision apparatus  100 . 
     Here, DFS service customers, that is, clients or users, may be provided with the multiple storage services using the storage provision apparatus  100 . 
     Here, the storage provision apparatus  100  may manage integrated storage  20  based on multi-tenant architecture in order to provide multiple storage services. 
       FIG. 9  is a flowchart that shows a storage provision method for registration of a storage service according to an embodiment of the present invention. 
     Referring to  FIG. 9 , in the storage provision method for registration of a storage service according to an embodiment of the present invention, first, the storage provision apparatus  100  may process the login of a provider at step S 310 . 
     Here, at step S 310 , in order to register a storage service, the provider may log on to the storage provision apparatus  100  using his or her ID and password, which have been registered in advance. 
     Here, at step S 310 , if the ID and password of the provider are not registered, a new ID and password may be created. 
     Also, in the storage provision method for registration of a storage service according to an embodiment of the present invention, a storage service may be registered in the storage at step S 320 . 
     That is, at step S 320 , cloud storage  21  and non-cloud storage  22  are checked in order to register a storage service, and the storage service may be registered. 
     Here, at step S 320 , a registration method may be provided to the provider using a GUI so that the provider may easily register a storage service. 
     Here, at step S 320 , a storage service name, the specifications of storage (the size, whether caching is supported, the number of tiers, whether encryption is supported, whether on-premises storage is supported, and the like), a data storage service protocol, the name and type of cloud storage, and the like are input by the provider via the GUI, and the service may be registered in the storage corresponding to the input information. 
     Here, the information input via the GUI may be registered in advance when a new provider registers his or her ID and password. 
     Also, in the storage provision method for registration of a storage service according to an embodiment of the present invention, storage may be configured at step S 330 . 
     That is, at step S 330 , virtual storage corresponding to the storage in which the storage service is registered may be created. 
     Here, at step S 330 , the virtual storage may be registered in a virtual disk pool. Using the virtual disk pool, a single storage view for providing a storage service may be provided to users. 
       FIG. 10  is a block diagram that shows an apparatus for providing storage according to an embodiment of the present invention. 
     Referring to  FIG. 10 , the apparatus for providing storage according to an embodiment of the present invention is configured as multi-tenant storage by including as many storage connection units  110 , as many data manipulations units  120 , as many data distribution and storage units  130 , and as many backend storage management units  140  as the number of storage services registered by DFS service providers A to C. Here, the respective units become the components of each layer or main components of the storage provision apparatus  100 . 
     That is, the storage provision apparatus  100  may support a multi-tenant function for simultaneously performing multiple services. 
     Here, a provisioning and policy management unit  150  may provide an administration GUI to an administrator, and may provide and manage a multi-tenant storage service. 
       FIG. 11  is a block diagram that shows a storage provision apparatus using a backend connection daemon according to an embodiment of the present invention. 
     Referring to  FIG. 11 , the storage provision apparatus using a backend connection daemon according to an embodiment of the present invention includes a single provisioning and policy management unit  150 , multiple storage connection units  110 , multiple data manipulation units  120 , multiple data distribution and storage units  130 , and multiple backend storage units  140 . Here, the multiple storage connection units  110 , the multiple data manipulation units  120 , the multiple data distribution and storage units  130 , and the multiple backend storage units  140  are provided for respective storage services provided by service providers  31 ,  32  and  33 . 
     The storage connection unit  110  may provide the storage service of integrated storage  20  by operating in connection with the integrated storage  20 . 
     Here, the integrated storage  20  may include non-cloud storage  22  and at least one cloud storage unit  21 . 
     The data manipulation unit  120  may create a virtual disk pool of the integrated storage  20 , thereby providing a single storage view using at least one virtual disk. 
     Here, the data manipulation unit  120  may provide the integrated storage  20  as virtual data storage regardless of the location at which data is actually stored. 
     Here, the storage connection unit  110  may provide a user with an interface for using the virtual data storage as a single virtual storage unit. 
     Here, the storage connection unit  110  may provide information about the configuration of the single virtual storage unit and interface management information to a user in response to a request from the user. 
     Here, the storage connection unit  110  may provide an access mechanism through which a user may use the single virtual storage unit. 
     Here, the storage connection unit  110  provides registered information that matches user requirements, and the user requirements may include at least one of the capacity of storage, an access mechanism, and the storage type of the single virtual storage unit. 
     The data distribution and storage unit  130  may provide a data distribution and encryption function such that the received data to be written may always be accessed with the minimum overhead. 
     Here, the data distribution and storage unit  130  may distribute the data in order to store the data in the integrated storage  20 , including on-premises storage and cloud storage. 
     The backend storage management unit  140  may interface with the integrated storage  20  using a connection daemon in the form of software. 
     Here, the backend storage management unit  140  may include an interface for storage (an object storage interface or a block storage interface) and a backend connection daemon configured to interface with various types of storage, and may provide a proxy interface for easy registration of multiple storage devices. 
     Here, the proxy interface of the backend storage management unit  140  may register a cloud service by detecting the storage area interface of the first daemon, which is connected to the cloud storage  21 , or of the second daemon, which is connected to the non-cloud storage  22 . 
     The backend storage proxy may register a service in such a way that the backend connection daemon, which stores an object storage interface daemon or a block storage interface driver therein, automatically detects the storage area interface. 
     For connection with the integrated storage  20 , the backend connection daemon may be run through a virtual machine or a container, excluding a block device, whereby the connection with object storage may be made. 
     Here, the backend storage management unit  140  may output information about the connected storage as storage in which a storage service may be registered. 
     Here, the backend storage management unit  140  may manage information for access by a user to a system and provide a secure path for access for registration of a storage service. 
     Here, the backend storage management unit  140  may create a backend connection daemon whenever a single storage device is connected therewith, and may connect the backend connection daemon with a proxy server. The proxy server (not illustrated) may store and manage data of a user using a driver interface that is connected with a virtual disk pool (vPool) through the data manipulation unit  120 . 
     Here, the backend storage management unit  140  is connected with the integrated storage  20  in order to store data therein, and may provide information about storage tiering pertaining to the data. 
     Accordingly, the storage provision apparatus  100  may create a single virtual disk (Vdisk) when a registered service provider connects to the storage provision apparatus  100 , and the created virtual disk may be managed in the virtual disk pool. Here, using the individual virtual disk pool, a user may be provided with multiple storage services from the storage in which the storage services are registered. 
     The provisioning and policy management unit  150  may manage provision of storage services based on multi-tenant architecture by receiving registration of the storage services from multiple service providers. 
     Here, the provisioning and policy management unit  150  enables an administrator to register cloud storage  21  and non-cloud storage  22  for providing a storage service and to configure a new service in the storage provision apparatus  100  using an administration GUI. 
     Here, when a service provider signs up for the service and uploads and creates a file, the provisioning and policy management unit  150  may create a cloud account, and the uploaded file may be stored in the cloud storage  21  or non-cloud storage  22  at the discretion of the administrator. 
     Here, the provisioning and policy management unit  150  may also provide the function of displaying, writing, modifying and deleting the content of a cloud service registered in the cloud storage  21  and the non-cloud storage  22 , which are integrated into the integrated storage  20 , using the administration GUI. 
     Separately from the non-cloud storage  22 , the service of the cloud storage  21  may be provided along with the basic configuration thereof. 
     Here, the provisioning and policy management unit  150  may configure the functions of logical components as individual servers, virtual systems, or containers having a connection network by taking the form of a module or function having each of the logical component functions. 
     Here, the provisioning and policy management unit  150  may register the storage service in a storage device that matches service registration information input by a service provider, among the storage devices included in the integrated storage  20 . 
     Here, the provisioning and policy management unit  150  may provide the storage service by configuring virtual storage in the storage in which the storage service is registered. 
     Here, the provisioning and policy management unit  150  may manage the storage service using a first path, which is a data path along which data is moved, and a second path, which is a control path for controlling data, in order to prevent the I/O performance of the storage service from being degraded. 
       FIG. 12  is a flowchart that shows a method for providing storage according to an embodiment of the present invention. 
     Referring to  FIG. 12 , in the method for providing storage according to an embodiment of the present invention, first, data may be accessed at step S 410 . 
     That is, in order to provide a user with the storage service of integrated storage  20 , data may be accessed at step S 410 . 
     Here, the integrated storage  20  may include non-cloud storage  22  and at least one cloud storage unit  21 . 
     The non-cloud storage  22  may be on-premises storage. 
     In the method for providing storage according to an embodiment of the present invention, a single storage view may be provided at step S 420 . 
     That is, at step S 420 , a virtual disk pool of the integrated storage  20  is created, whereby a single storage view may be provided using at least one virtual disk. 
     Here, at step S 420 , the integrated storage  20  may be provided as virtual data storage regardless of where data is actually stored. 
     Here, at step S 420 , an interface for using the virtual data storage as a single virtual storage unit may be provided to the user. 
     Here, at step S 420 , information about the configuration of the single virtual storage unit and interface management information may be provided to a user in response to a request from the user. 
     Here, at step S 420 , an access mechanism through which a user may use the single virtual storage unit may be provided. 
     Here, at step S 420 , registered information matching user requirements is provided, and the user requirements may include at least one of the capacity of storage, an access mechanism, and the storage type of the single virtual storage unit. 
     Here, at step S 420 , a data distribution and encryption function may be provided such that the received data to be written is accessed always with the minimum overhead. 
     Here, at step S 420 , the data may be distributed so as to be stored in the integrated storage  20 , including the on-premises storage and the cloud storage. 
     Also, in the method for providing storage according to an embodiment of the present invention, interfacing is performed at step S 430 . 
     That is, at step S 430 , interfacing with the integrated storage  20  may be performed using a connection daemon in the form of software. 
     Here, at step S 430 , an interface for storage (an object storage interface or a block storage interface), a backend connection daemon configured to interface with various types of storage, and a proxy interface for easy registration of multiple storage devices may be provided. 
     Here, at step S 430 , a proxy interface may register a cloud service by detecting the storage area interface of the first daemon, which is connected with the cloud storage  21 , and of the second daemon, which is connected with the non-cloud storage  22 . 
     The backend storage proxy may register a service in such a way that the backend connection daemon, which stores an object storage interface daemon or a block storage interface driver therein, automatically detects the storage area interface. 
     For connection with the integrated storage  20 , the backend connection daemon may be run through a virtual machine or a container, excluding a block device, whereby the connection with object storage may be made. 
     Here, at step S 430 , information about the connected storage may be output as storage in which a storage service may be registered. 
     Here, at step S 430 , information for access by a user to a system may be managed, and a secure path for access for registration of a storage service may be provided. 
     Here, at step S 430 , a single backend connection daemon may be created whenever a single storage device is connected, and the backend connection daemon may be connected with a proxy server. The proxy server may store and manage data of a user using a driver interface connected with a virtual disk pool through the data manipulation unit  120 . 
     Here, at step S 430 , the integrated storage  20  is connected in order to store data therein, and the storage tiering information pertaining to the data may be provided. 
     Accordingly, the storage provision apparatus  100  may create a single virtual disk in response to access by a registered service provider thereto, and the created virtual disk may be managed in the virtual disk pool. Here, using the individual virtual disk pool, a user may be provided with multiple storage services from the storage in which the storage services are registered. 
     Also, in the method for providing storage according to an embodiment of the present invention, a storage service may be provided at step S 440 . 
     That is, at step S 440 , the provision of a storage service may be managed based on multi-tenant architecture by receiving registration of storage services from multiple service providers. 
     Here, at step S 440 , an administrator may register cloud storage  21  and non-cloud storage  22  for providing a storage service in the storage provision apparatus  100  and configure a new service using an administration GUI. 
     Here, at step S 440 , when a service provider signs up for the service and uploads and creates a file, a cloud account may be created, and the uploaded file may be stored in the cloud storage  21  or the non-cloud storage  22  at the discretion of the administrator. 
     Here, at step S 440 , the function of displaying, writing, modifying and deleting content of a cloud service registered in the cloud storage  21  and the non-cloud storage  22 , which are integrated into the integrated storage  20 , may be provided using the administration GUI. 
     In the configuration of storage, the service of the cloud storage  21  may be provided along with the basic configuration thereof, separately from the non-cloud storage  22 . 
     Here, at step S 440 , the individual functions of logical components may be configured as servers, virtual systems, or containers having a connection network by implementing modules or functions having the respective logical component functions. 
     Here, at step S 440 , the storage service may be registered in a storage device that matches service registration information input by the service provider, among the storage devices included in the integrated storage  20 . 
     Here, at step S 440 , the storage service may be provided by configuring virtual storage in the storage in which the storage service is registered. 
     Here, the storage service may be managed using a first path, which is a data path along which data is moved, and a second path, which is a control path for controlling data, in order to prevent I/O performance of the storage service from being degraded. 
       FIG. 13  is a block diagram that shows a computer system according to an embodiment of the present invention. 
     Referring to  FIG. 13 , the user client device  10  and the storage provision apparatus  100  according to an embodiment of the present invention may be implemented in a computer system  1100  including a computer-readable recording medium. As shown in  FIG. 13 , the computer system  1100  may include at least one processor  1110 , memory  1130 , a user interface input device  1140 , a user interface output device  1150 , and storage  1160 , which communicate with each other via a bus  1120 . Also, the computer system  1100  may further include a network interface  1170  connected with a network  1180 . The processor  1110  may be a central processing unit or a semiconductor device for executing processing instructions stored in the memory  1130  or the storage  1160 . The memory  1130  and the storage  1160  may be various types of volatile or nonvolatile storage media. For example, the memory may include ROM  1131  or RAM  1132 . 
     The present invention may improve the performance of read and write operations in integrated storage that combines cloud storage and on-premises storage. 
     Also, the present invention may enable cloud storage and on-premises storage included in integrated storage to provide a data storage service with the same performance. 
     Also, the present invention may enable data of a user to be moved based on the flexibility of a storage space and cost efficiencies. 
     Also, the present invention may support various types of cloud storage services, such as Amazon S3, Microsoft Azure, and the like, thereby providing an integrated storage service that meets user requirements. 
     Also, the present invention may enable data in cloud storage to be accessed at a speed close to the speed at which data in on-premises storage is accessed. 
     Also, the present invention may provide a service interface through which a user may access cloud-integrated storage using various service protocols. 
     Also, the present invention may provide various types of storage services, such as a storage service for storing conventional files or data blocks, a storage service for storing objects, which has recently come to be provided by cloud storage providers, and the like. 
     Also, the present invention may guarantee secure data transfer between on-premises storage and cloud storage, thereby guaranteeing the confidentiality of user data. 
     Also, the present invention may prevent data loss caused due to system errors. 
     Also, the present invention may make it easy to construct a system by providing cloud-integrated storage in the form of an appliance in which storage hardware and software are integrated for user convenience. 
     Also, the present invention may provide a multitenant function for simultaneously performing multiple cloud services. 
     As described above, the apparatus and method for providing storage for providing a cloud service according to the present invention are not limitedly applied to the configurations and operations of the above-described embodiments, but all or some of the embodiments may be selectively combined and configured, so that the embodiments may be modified in various ways.