Abstract:
A user interface (UI) is accessible on a display to depict and control a plurality of smart racks in a data center is disclosed. The UI includes first, second and third graphical displays. The first graphical display depicts smart racks in the data center so as to mimic a physical arrangement of the smart racks. The second graphical display depicts a plurality of blade hosts in a smart rack in the plurality of smart racks, so as to mimic a physical arrangement of the plurality of blade hosts. The first and second graphical display may include visual indicators to depict error and warning conditions. The third graphical display depicts blade information about a blade host in the plurality of blade hosts. The blade information includes system information, a list of virtual machines hosted on the blade host, and a physical location of the blade host in the data center.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a divisional of the U.S. patent application Ser. No. 12/827,977 filed on Jun. 30, 2010, entitled Data Center Inventory Management Using Smart Racks. While the priority date is not based thereon, this application is related to U.S. application Ser. No. 12/718,388, filed on Mar. 5, 2010, entitled “Managing a Datacenter Using Mobile Devices”, which is being incorporated herein by reference. 
     
    
     BACKGROUND 
     Data Centers 
       [0002]    With the explosive growth in the use of computers to host business applications, Internet Websites, etc., a need to build bigger data centers to house computers and related hardware has also grown exponentially. Many data centers (also known as “server farms”) these days typically house thousands of computers and related equipments such as networking gears, etc. 
         [0003]    A data center or a server farm is a facility to house a number of computer systems and related equipment. For example, a business organization may house all or some of their computer servers (i.e., hosts) at one physical location in order to manage these computer servers efficiently. The computer servers in a data center are typically connected to users of the computer servers via the Internet or Wide Area Network (WAN) or Local Area Network (LAN) or any other similar type of medium. These computer servers are typically used to host critical business applications. Since the business operations of these business organizations critically depend on the continuous availability of the computer servers, special attention is paid to manage data centers to prevent or minimize server down times. Inventory management of the computing resources in a data center plays a critical role in ensuring high availability of computing resources. Unfortunately, at present, data center inventory is maintained manually, typically using spreadsheets or similar manual methods. This method of tracking inventory of computing resources is highly inefficient, especially for large size data centers. 
       Data Center Racks 
       [0004]    Computer systems and other related components (e.g., network switches, routers, etc.) in a data center are housed in metallic cages, typically called racks. Racks are typically designed to maximize physical space utilization in a data center room. A rack may include a number of chassis. Chassis are used to house computer systems. In some cases, a rack may house non-blade computer system directly without a use of a chassis. Chassis are typically designed to maximize physical space utilization in a rack. Computer systems and other components are typically mechanically designed to maximize space utilization in a chassis. One of these mechanical designs of computer systems is referred to as a blade. A rack typically has wire harnesses for network (and power) cables that connect each blade to the computer network. Blades are typically designed to easily slide into chassis slots. Once a blade is physically put in place in a chassis, typically, the blade automatically connects to the network and power adapters in the rack. 
       Radio Frequency Identification (RFID) 
       [0005]    One of the applications of RFID technology is to track moveable objects. A typical RFID system includes a RFID tag and a RFID reader. A RFID tag is typically very small and can be produced in sizes and shapes to be easily adoptable to the objects to be tracked. A RFID tag typically includes a miniature electronic circuit and a miniature antenna. The electronic circuit generates radio frequency waves that are transmitted by the antenna. The range of such transmission is typically configurable and may vary from a few centimeters to several meters. The transmission range is configured to a particular range to fit to a particular type of object tracking application. A RFID reader is configured to receive the signals transmitted by RFID tags. One or more RFID readers are typically connected to a computer system, which is configured to read and decipher the signals transmitted by RFID tags. The signals may include some configurable information about the object to which a RFID tag is attached. The information transmitted by a RFID tag generally includes unique identification information about the RFID tag or the object being tracked. 
         [0006]    RFID tags are typically of two types, active tags and passive tags. An active tag generally includes a built-in source of power and this type of tag may transmit signals to relatively greater distances. A passive tag, on the other hand, does not include its own built-in source of power and hence requires an external source to activate a signal transmission. Typically, a RFID reader sends signals to a passive RFID tag to activate the RFID tag. 
       Virtualization 
       [0007]    The computing industry has seen many advances in recent years, and such advances have produced a multitude of products and services. Computing systems have also seen many changes, including their virtualization. Virtualization of computer resources generally connotes the abstraction of computer hardware, which essentially separates operating systems and applications from direct correlation to specific hardware. Hardware is therefore abstracted to enable multiple operating systems and applications to access parts of the hardware, defining a seamless virtual machine. The result of virtualization is that hardware is more efficiently utilized and leveraged. 
         [0008]    The advent of virtualization has sparked a number of technologies, which allow companies to optimize the utilization of their systems. As a company&#39;s enterprise systems are usually installed at various geographic locations in different data centers, networking protocols are used to interconnect the various systems, which can then be virtualized into one or more virtual servers. 
         [0009]    With the recent proliferation of virtual systems and servers, proper deployment and inventory management practices have become increasingly important. Even though virtual machines can be tracked using presently available tools and systems, there are no automated solutions available to track the physical locations of the physical hosts that host a particular virtual machine. Having such tracking information is important to quickly locate a malfunctioning physical server which is hosting a critical virtual machine. Manual methods of inventory control would fail to track such a physical server because virtual machines are moveable from one physical server to another and may move from one physical server to another at any time based on occurrence of some events. Some of these details are beyond the subject matter of the present disclosure, hence being omitted. 
       SUMMARY 
       [0010]    In one embodiment, a user interface (UI) to depict and control a plurality of smart racks in a data center is disclosed. The depiction is at a display, such as a computer monitor. The UI includes a first graphical display to depict the plurality of smart racks in the data center. The depiction in the first graphical display mimics a physical arrangement of the plurality of smart racks in the data center. The first graphical display may include visual indicators to depict error and warning conditions in the plurality of smart racks. 
         [0011]    The UI further includes a second graphical display to depict a plurality of blade hosts in a smart rack in the plurality of smart racks. The depiction in the second graphical display mimics a physical arrangement of the plurality of blade hosts. The second graphical display may include visual indicators to depict error and warning conditions in the plurality of blade hosts. 
         [0012]    The UI also includes a third graphical display to display blade information about a blade host in the plurality of blade hosts. The blade information may include at least one of system information, a list of virtual machines hosted on the blade host, and physical location of the blade host in the data center. The physical location may include smart rack identification, chassis identification, and slot identification in which the blade host resides. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments. The present invention is illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar elements and in which: 
           [0014]      FIG. 1  illustrates a logical diagram of a data center management system in accordance with one or more embodiments of the present invention. 
           [0015]      FIG. 2  illustrates a schematic diagram of a data center rack in accordance with one or more embodiments of the present invention. 
           [0016]      FIG. 3  illustrates a schematic diagram of a data center rack chassis in accordance with one or more embodiments of the present invention. 
           [0017]      FIG. 4  illustrates a logical diagram of a rack controller in accordance with one or more embodiments of the present invention. 
           [0018]      FIG. 5  illustrates a logical diagram of sensors and readers interconnections with a rack controller in accordance with one or more embodiments the present invention. 
           [0019]      FIG. 6  illustrates an exemplary graphical user interface showing racks in a data center in accordance with one or more embodiments of the present invention. 
           [0020]      FIG. 7  illustrates a flow diagram for preparing a rack for maintenance or power shutdown in accordance with one or more embodiments of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0021]      FIG. 1  illustrates a logical diagram of a data center management system  100 . Various parts of Data Center Management System  100  may be interconnected through a Local Area Network (LAN) or a Wide Area Network (WAN) or the Internet. Hence, Network  120  may be a LAN, a WAN or the Internet. The underlying connection may be either wired or wireless (e.g., WiFi or such). It should be noted that even though some of the parts of Data Center Management System  100  are shown as a box, these parts may themselves be spread across several physical or virtual systems and may include associated parts (e.g., databases, network switches, etc.). These parts are not being shown and described to avoid obscuring the present disclosure. 
         [0022]    Data Center Management System  100  includes a Resource Management System  102 . Resource Management System  102  manages computing resources of a data center. In one example, Resource Management System  102  (e.g., VMware vSphere®) enables configuration and management of the computing infrastructure of a data center. In one or more embodiments, Resource Management System  102  may include a user interface to allow easy navigation for computing resources in a data center. Resource Management System  102  may also provide search functionality to perform lookups for virtual machines, hosts, datastores, and networks in a data center. Resource Management System  102  may also include alarms to indicate hardware failures of key components such as fans, system board and power supply. Resource Management System  102  may also provide management of data storages, including reporting storage usage, connectivity and configuration. Resource Management System  102  may also include monitoring virtual machines, resource pools and server utilization and availability. 
         [0023]    In one or more embodiments, Resource Management System  102  may also include support for profile based configuration and management of virtualization system configurations and management. Resource Management System  102  may also be configured to provide power management functionality across the data center computer resources. Through the power management functionality, Resource Management System  102  may reduce power consumption by putting hosts in standby mode when the demand for the computing resources is lower than available online computing resources. Resource Management System  102  may also provide functionality for automatically updating or patching software on data center hosts and virtual machines. 
         [0024]    In one or more embodiments, Resource Management System  102  may also be configured to provide physical to virtual (P2V) machine conversion functionality. For example, if a host is added to the data center that is being managed by Resource Management System  102 , the host may be automatically virtualized through automatic installation of virtualization software on the host. In one or more embodiments, Resource Management System  102  maintains preconfigured virtualization software images for different types of host hardware configurations and for different types of usages. For example, one image may include a preconfigured email server, another image may include a preconfigured Web server, etc. The pre-configurations are done to adapt to the properties of the data center and the business organization that would ultimately use the newly virtualized host. For example, the pre-configured properties may include specific server names and resource addresses. 
         [0025]    In one or more embodiments, Resource Management System  102  may provide automatic discovery of hosts such that when a host is added to the data center, the newly added host is automatically added to the list of resources being managed by Resource Management System  102 . A data center may have one or more instances of Resource Management System  102 , all working cooperatively to provide a highly scalable system that may be capable of managing thousands of hosts and tens of thousands of virtual machines in a data center. 
         [0026]    Resource Management System  102 , in one or more embodiments, may also provide resource management for virtual machines to allocate processor and memory resources to virtual machines running on the same physical servers and to establish minimum, maximum, and proportional resource shares for CPU, memory, disk and network bandwidth. Resource Management System  102  may also modify these allocations while virtual machines are running and may enable applications to dynamically acquire more resources to accommodate peak performance. Resource Management System  102  is also capable of effectuating moving of virtual machines from one host to another when needs arise (such as failovers, power management, etc.) or on occurrences of some pre-selected events in the data center. 
         [0027]    Resource Management System  102 , in one or more embodiments, exposes programming and communication interfaces to enable exchange of data to and from other parts of Data Center Management System  100  (e.g., Inventory Management System  110 ). 
         [0028]    Data Center Management System  100  includes an inventory management system  110 . Inventory Management System  100  is coupled to a data store  112  to store inventory data, including physical locations of various computing resources in a data center. Data Center Management System  100  further includes one or more smart racks  150  that are in communication with Resource Management System  102  and Inventory Management System  110  through Network  120 . Inventory Management System  110  is configured to store physical locations of Racks  150  in a data center. The physical locations of Racks  150  may be stored by isle and sequence numbers or by any other addressing mode that is capable of providing identifiable physical locations of racks in a data center. For example, reference coordinates with respect to one corner of a data center room may be used for location identification of a particular rack. In another example, a matrix addressing (row x, column y) may also be used if Racks  150  are placed in a substantial rectangular arrangement in a data center room. As it is explained later in this document, a rack is mechanically configured to receive a plurality of chassis and each chassis may have provisions to provide storage for a plurality of blades. Inventory Management System  110  also stores physical locations of each chassis and each blade slot. Hence, a particular blade slot may be addressed by the combination of a rack location identifier, a chassis number and a blade space number. 
         [0029]      FIG. 2  illustrates a rack  150  in one embodiment. Rack  150  can be substantially rectangular in shape. However, a person skilled in the art would appreciate that other mechanical shapes are within the scope of this disclosure. Rack  150  may be made of a sturdy material, such as metal, wood, alloy or polymer plastics (or any other man made materials) so long as the material is capable of providing a sturdy cage to hold heavy payload. The dimensions of Rack  150  may depend upon the configuration of the space within a data center room in which Rack  150  would be housed. The outer physical shape of a rack typically allows stacking up a plurality of racks side by side. The space inside Rack  150 , in one embodiment, is designed to maximize natural air flow cooling. However, Rack  150  may also be configured with one or more fans to route heat out of Rack  150  effectively. Rack  150  may also include temperature, humidity and/or other types of sensors. These sensors may be configured to be in communication with Rack Controller  170  (to be described later) and data collected through one or more of these sensors may be stored in Inventory Management System  110  along with other data related to a particular rack. In another embodiment, this data may also be stored locally in Rack Controller  170 . 
         [0030]    Rack  150  includes a plurality of RFID adapters  160  to receive sensor hubs of chassis (shown in  FIG. 3 ). Each RFID adapter  160  includes a mechanical socket to easily receive a counterpart socket that is attached to a sensor hub in a chassis. Rack  150  may have guide rails to enable chassis to slide easily into a chassis slot. Guide rails, RFID adapter sockets and sensor hub sockets are so aligned that when a chassis slides in a chassis slot, the sensor hub of the chassis comes in mechanical and electrical contact with the corresponding RFID adapter in the rack. 
         [0031]    In one embodiment, Rack  150  further includes a rack controller  170 . Wire harnesses that connect various sensors, sensor hubs and RFID adapters terminate in Rack Controller  170 . Rack Controller  170  is coupled to Inventory Management System  110  through Network Interface  180 , which is an interface to couple Rack Controller with Network  120 . Rack Controller  170 , in one embodiment, includes a programming logic to read and collect data from various sensors and store the data, at least temporarily, prior to transmitting the collected data to Inventory Management System  110 . In other embodiments, Inventory Management System  110  triggers the process of data collection. That is, at least a part of the programming logic to read and collect data from sensors resides in Inventory Management System  110 . Rack Controller  170  further includes a power interface  190  to provide power to Rack Controller  170  and various adapters and sensors in Rack  150 . In one embodiment, Power Interface  190  is also configured to provide electrical power to hosts in Rack  150  through a power wire harness. In another embodiment, a separate power harness is provided to power hosts and other computing resources in Rack  150 . In such embodiment, Rack Controller  170  may monitor the status of the power supply for reporting purposes. 
         [0032]    In one embodiment, Rack  150  includes a Display Unit  172  to display messages from Inventory Management System  110  and/or Resource Management System  102 . Display Unit  172  may also be configured to provide a user interface to Rack Controller  170 , hence enabling a designated user (i.e., a user who is authorized to manage a data center) to interact with Rack Controller  172  for the purposes of configuring, programming, testing, or debugging Rack Controller  170  and sensors. Display Unit  172  may be a liquid crystal display (LCD) or any similar type of display that is capable of displaying textual and/or graphical data and to receive inputs from a designated user. In another embodiment, Display Unit  172  may include one or more lighting devices to provide visual messages using predefined patterns or color coding for communicating predefined sets of messages. For example, a red light signal may indicate an error condition somewhere in Rack  150 . A yellow light may indicate a warning, etc. In one example, these lights may be appropriately placed on the racks in a data center room so that when the designated user walks into the data center room, he/she may readily spot racks with error conditions. The designated user may use an admin console of Inventory Management System  110  to get more information about the error condition. Moreover, Display Unit  172  may also be used to get details of an error or warning conditions. Inventory Management System may be configured to send notifications via email, text messaging, etc. to a pre-configured group of people when error conditions arise in a rack. In another embodiment, a similar display unit may be provided at each chassis. 
         [0033]    Referring now to  FIG. 3 , which illustrates an exemplary schematic diagram of a chassis  200 . As mentioned earlier, Chassis  200  provides housing for one or more blades. As explained briefly earlier, a blade is a common term used for a special mechanical design for a computer system or any other electronic component such as a network switch. The blade design is suitable for quickly inserting or removing computing resources to or from a network and to provide optimal space utilization in a rack. The term “blade server” is well known in the art, hence a detailed description is being omitted to avoid obscuring the present disclosure. Chassis  200  includes one or more slots for sliding blades into Chassis  200 . Each slot has electro-mechanical connectors to electrically and mechanically couple an inserted blade with Network  120  and the power supply. Storage Area Storage (SAN) interfaces may also be provided in each slot on Chassis. Each slot may be provided with a RFID sensor (i.e., a RFID reader)  220 , which is capable of reading a RFID tag. Each inserted blade, if the inserted blade needs to be monitored by Rack Controller  170 , is provided with a RFID tag. Chassis  200  also includes a sensor hub  210  to aggregate input wiring from RFID Sensors  220 . Sensor Hub  210  may be a USB hub, in one embodiment. In other embodiments, Sensor Hub can be any multi conductor polarized connector. Sensor Hub  210  is configured to electrically and mechanically couple RFID sensors with the corresponding RFID Adapter  160  in Rack  150  when Chassis  200  is incorporated in Rack  150 . In one embodiment, a computing resource (e.g., a computer system) may be directly incorporated in Rack  150  without Chassis  200 . In such embodiment, the mechanical shape of the computing resource is similar to Chassis  200 . Chassis  200  may also include temperature, humidity and/or other types of sensors. These sensors may be configured to be in communication with Rack Controller  170  and data collected through one or more of these sensors may be stored in Inventory Management System  110 . 
         [0034]    It should be noted that existing conventional racks may be retrofitted with above mentioned electro-mechanical hardware (e.g., various sensors, hubs, adapters, rack controller, etc.) to convert existing conventional racks into Rack  150 . 
         [0035]    In one embodiment, security features may also be incorporated in Rack  150  and/or Chassis  200 . For example, a security pad may be installed on each Rack  150 . The security pad may be coupled to an electronic security system and may be used to identify and authenticate a person, who attempts to remove Chassis  200  or a blade from Chassis  200 . The security pad may have a number pad, a fingerprint scanner or a security card scanner. Mechanical locks may be provided on removable parts of Rack  150  or Chassis  200 . These mechanical locks may be released only if a person attempting to remove or insert a component properly authenticate himself/herself. In one embodiment, Display Unit  172  may also be used as a security pad for entering authentication information. 
         [0036]    It should be noted that the mechanical placement of various sensors, hubs, adapters, rack controller, etc. may change depending upon design considerations. As such, these components may be placed at any suitable locations in Rack  150  so long as the functionality remains within the scope of the present disclosure. 
         [0037]    It should also be noted that in some embodiments, other technologies (e.g., Bluetooth, Bar codes, Open Computer Vision, Pattern Recognition, etc.) may also be used instead of RFID by using different types of sensors and devices that are suitable for a particular type of technology. For example, if the bar code technology is used, a blade will be affixed with a unique bar code while RFID sensors are replaced by bar code readers. In one embodiment, MAC addresses of computing resources may also be used instead of RFID. In such embodiment, a MAC address to Physical location mapping may be stored in Inventory Management System  110 . 
         [0038]      FIG. 4  illustrates a logical block diagram of Rack Controller  170 . In one embodiment, Rack Controller  170  includes a microcontroller  197  to execute programming instructions for controlling Rack  150  sensors, for collecting data from sensors, and for storing the collected data in a local database  194 . Microcontroller  197  may also be used for enabling communication between components of Rack  150  with Inventory Management System  110  and for providing display logic for Display Unit  172 . Rack Controller  170  further includes a communication port  192  to enable communication between the sensors of Rack  150  and programming modules such as Polling Module  196  and Data Collector  198 . Microcontroller  197  may also be coupled to Network Interface  180  and Power Interface  190 . Microcontroller  197  may also provide an interface to configure Rack Controller  170  through additional programming instructions. Database  194  may be a solid state memory device or it can also be a magnetic disk memory. Database  194  may also be used for storing programming instructions to or from various modules of Rack Controller  170 . Display Unit  172  may be used for adding new programming instructions or configurations to Rack Controller  170 . Alternatively, new programming instructions and/or configurations may be pushed to Rack Controller  170  from or through Inventory Management System  110 . 
         [0039]      FIG. 5  illustrates a schematic diagram of exemplary interconnections of RFID Sensors  220 , Sensor Hubs  210 , RFID Adapters  160  and Rack Controller  170 . In one embodiment, the interconnections are through a wire harness. In other embodiments, the interconnections may be implemented through wireless communication technologies such as Bluetooth or WiFi. In another embodiment, the interconnections may be provided through the LAN wiring that can couple RFID Sensors  220 , Sensor Hubs  210  and RFID Adapters  160  to Network  120 . In one embodiment, network communication to and from computing resources in Rack  150  continues to work unaffected when one or more RFID Sensors  220 , Sensor Hubs  210 , RFID Adapters  160 , or Rack Controller  170  malfunction. To avoid introducing an extra point of failure, the system and process of collecting and managing inventory data work separate from normal computing operations of computing resources in Rack  150 . Moreover, Rack Controller  170  may be equipped with programming logic to perform routine testing of RFID Sensors  220 , Sensor Hubs  210  and RFID Adapters  160 . The programming logic in Rack Controller  170  is also configured to collect inventory data and store at least a part of collected data locally for a period of time before the collected data is transmitted to Inventory Management System  110 . The locally stored data may be transmitted to Inventory Management System  110  at pre-configured regular intervals. Alternatively, the locally stored data may be pushed to Inventory Management System  110  when Inventory Management System  110  requests such information. In another embodiment, Inventory Management System  110  may retrieve the locally stored data directly from Rack Controller  170  database. Some information, for example when a blade is removed, may be transmitted to Inventory Management System  110  immediately or as early as possible. In one or more embodiments, Polling Module  196  performs polling of sensors in Rack  150  at regular intervals. In another embodiment, any other technique for reading RFID tags may be used so long as the technique is capable of detecting events such as removal of blades, insertion of blades, etc. 
         [0040]    Referring back to Inventory Management System  110  of  FIG. 1 . In one embodiment, a user interface may be provided to enable initial data entry with respect to unique identifications (IDs) of smart racks, chassis and sensors along with physical locations of these components in a data center. When a blade with an RFID tag is inserted in any slot in any smart rack, RFID sensor of that slot sends a signal to Rack Controller  170  (or in another embodiment, Rack Controller  170  may receive this information through the polling process). The inventory data in Inventory Management System  110  is automatically updated to reflect the addition of this new blade including a host name and a unique ID number. Resource Management System  102  is also automatically updated when a new blade is detected in a smart rack. In one embodiment, Resource Management System  102  may automatically install virtualization software on the newly added host and may also perform further configurations such as setting up one or more virtual machines on the newly added host and adding these virtual machines in a particular cluster or some other type of logical group of virtual machines. 
         [0041]      FIG. 6  illustrates an exemplary graphical user interface (GUI)  250  for viewing data center racks on a display. In one embodiment, GUI  250  shows a graphical view of a data center room in which a plurality of racks are housed. GUI  250  substantially mimics the physical arrangement of the racks in a data center room. In one embodiment, GUI  250  display may be re-arranged to match the actual arrangement of racks in a data center room. The rearrangement may be accomplished by moving displayed graphical objects on the display in a desired arrangement and saving the new arrangement. In one exemplary embodiment, Inventory Management System  110  can be configured to retrieve locations of the plurality of racks in the data center room through rack location sensors in a data center room and may automatically generate a graphical depiction of racks. In one example, the WiFi triangulation method may also be used to determine locations of racks in a data center room. 
         [0042]    The displayed object on GUI  250  may also be configured to display error conditions. In one exemplary embodiment, a color coding method may be used to visually display various operational and/or environmental conditions for each rack. In one exemplary embodiment, when a mouse pointer is brought over (or clicked, double clicked, etc.) a particular rack object in GUI  250 , GUI  250  displays a graphical view of the internal details of the rack (as shown as “Rack View” in  FIG. 6 ). The graphical objects in Rack View depict a plurality of Chassis and a plurality of blades. A color coded status may also be incorporated in each of the displayed objects to indicate operational conditions. In one exemplary embodiment, when a graphical depiction of a chassis or a blade is selected, more information about the depicted object is displayed (e.g., Blade Information  260 ). In one embodiment, Blade Information  260  may include system information, hosted virtual machines, physical location, temperature, humidity, etc. Some of the information, for example hosted virtual machines, system information, etc. is retrieved from Resource Management System  102 . Other information may be retrieved either from the corresponding Rack Controller  150  or from Inventory Management System  110  depending upon a particular configuration. 
         [0043]    GUI  250  may also be used to configure sending out notifications to a preconfigured group of entities. For example, the system may be configured to send emails, text messages, voice calls/voice mails, etc. to a preconfigured group of people in the event of the occurrence of one or more types of error conditions. 
         [0044]    Still further, in one exemplary embodiment, Resource Management System  102  may retrieve blade location information from Inventory Management System  110  and use the retrieved information to move critical virtual machines to relatively safe locations in the data center. For example, if flood conditions are detected, some or all virtual machines on hosts that reside in the lower parts of racks may be moved to the upper parts of racks. Furthermore, since top parts of racks would generally be hotter than the lower parts, some critical virtual machines may be moved to relatively lower parts of racks. It may be noted that Resource Management System  102  is capable of moving virtual machines from one host to another using the live migration technology (e.g., VMware VMotion™). 
         [0045]    In one exemplary embodiment, GUI  250  may be configured to divide racks in a data center in different sections. For example, a particular section of racks may be reserved for hosting computing resources of a particular organization (in the scenarios where the same data center is being used for hosting computing resources of different business organizations). In one embodiment, if the rack reservation is based on business organization, a network fencing scheme may be adopted to provide network isolation among computing resources of distinct business organizations. In another embodiment, the partition may be done based on types of computing resources. For example, a particular rack may be reserved to host Web servers and another rack may be marked to host email servers. In one exemplary embodiment, when a new blade is inserted into the rack which is reserved for Web servers, Resource Management System  102  automatically provisions the newly added blade to be used as a Web server. In one embodiment, when a new blade is added, Resource Management System  102  queries Inventory Management System  110  for location information as well as any particular type of rack reservation. In one embodiment, rack reservation may be put in place on a live data center. In this embodiment, Inventory Management System  110  will notify Resource Management System  102  about changes in rack reservation and Resource Management System  102  will live-migrate virtual machines according to the rack reservation scheme. 
         [0046]    In one example, Resource Management System  102  may provide automatic power saving features by consolidating virtual machines on fewer hosts when computing demand is low and then shutting down the remaining hosts. In one embodiment, Data Center Management System  100  further enhances the power save feature by consolidating virtual machines on fewer smart racks when the computing demand is low and then shutting down the remaining smart racks. Further, from time to time, smart racks may be put out of use for maintenance purposes. However, in order to do so, the hosts need be shutdown, hence causing interruptions in computing resources availability. Data Center Management System  100 , in one embodiment, is configured to automatically live migrate computing resources from a particularly identified smart rack. Further, Data Center Management System  100  may also be configured to monitor computer resource utilization for computing resources on each smart rack and if it is determined that a particular smart rack is only being used to run a number of virtual machines and if the number is below a set threshold, Data Center Management System  100  may start a process of live migrating the virtual machine from the particular smart rack to other racks. Once the virtual machines are live migrated, the particular smart rack may be put in a standby mode to save power. 
         [0047]    Accordingly,  FIG. 7  illustrates a process  300  of implementing live migration of virtual machines from a source smart rack to one or more destination smart racks. At step  302 , a list of physical hosts and a list of virtual machines running each of the physical hosts are received from Resource Management System  102 . At step  304 , Inventory Management System  102  provides the physical locations (i.e., smart racks for each of the physical hosts). At step  306 , the list of physical hosts is arranged by smart rack IDs to make a list of physical hosts on each of the smart racks in a data center. Since a list of virtual machine for each of the physical hosts is available, a list of virtual machines on each of the smart racks is created. At step  308 , virtual machines that can be live migrated are identified. In one example, if a smart rack needs to be shutdown, all virtual machines from this smart rack need to be live migrated. At step  310 , one or more destination smart racks are identified for receiving the identified virtual machines that are to be moved. At step  312 , such determination may be made based on spare computing power on one or more destination racks. For example, if a particular destination rack has hosts with a total computing capacity to run  100  virtual machines of a certain type and at present there are only  20  active virtual machines, then this destination smart rack could be candidate for receiving more virtual machines from the source smart rack. In one embodiment, a max capacity utilization factor of a destination physical host is also considered. In another embodiment, a prior capacity reservation factor of the destination physical host is taken into the consideration. At step  314 , live migration of all virtual machines from a source smart rack is commenced. 
         [0048]    With the above embodiments in mind, it should be understood that the invention can employ various computer-implemented operations involving data stored in computer systems. These operations are those requiring physical manipulation of physical quantities. Any of the operations described herein that form part of the invention are useful machine operations. The invention also relates to a device or an apparatus for performing these operations. In one embodiment, the apparatus can be specially constructed for the required purpose (e.g. a special purpose machine), or the apparatus can be a general-purpose computer selectively activated or configured by a computer program stored in the computer. In particular, various general-purpose machines can be used with computer programs written in accordance with the teachings herein, or it may be more convenient to construct a more specialized apparatus to perform the required operations. 
         [0049]    The embodiments of the present invention can also be defined as a machine that transforms data from one state to another state. The transformed data can be saved to storage and then manipulated by a processor. The processor thus transforms the data from one thing to another. Still further, the methods can be processed by one or more machines or processors that can be connected over a network. The machines can also be virtualized to provide physical access to storage and processing power to one or more users, servers, or clients. Thus, the virtualized system should be considered a machine that can operate as one or more general purpose machines or be configured as a special purpose machine. Each machine, or virtual representation of a machine, can transform data from one state or thing to another, and can also process data, save data to storage, display the result, or communicate the result to another machine. 
         [0050]    The programming instructions and modules can also be embodied as computer readable code on a computer readable medium. The computer readable medium is any data storage device that can store data, which can be thereafter be read by a computer system. Examples of the computer readable medium include hard drives, network attached storage (NAS), read-only memory, random-access memory, CD-ROMs, CD-Rs, CD-RWs, magnetic tapes and other optical and non-optical data storage devices. The computer readable medium can include computer readable tangible/non-transitory medium distributed over a network-coupled computer system so that the computer readable code is stored and executed in a distributed fashion. 
         [0051]    Although the method operations were described in a specific order, it should be understood that other housekeeping operations may be performed in between operations, or operations may be adjusted so that they occur at slightly different times, or may be distributed in a system which allows the occurrence of the processing operations at various intervals associated with the processing, as long as the processing of the overlay operations are performed in the desired way. 
         [0052]    Although the foregoing invention has been described in some detail for purposes of clarity of understanding, it will be apparent that certain changes and modifications can be practiced within the scope of the appended claims. Accordingly, the present embodiments are to be considered as illustrative and not restrictive, and the invention is not to be limited to the details given herein, but may be modified within the scope and equivalents of the appended claims.