Abstract:
A system and method for managing the temperature of a data center is disclosed in which a target computer system is identified. The target computer system is the system that requires access or service. The operation of the computer systems in the vicinity of the target computer system is modified to reduce the temperature in the vicinity of the target computer system or along the pathway between the entrance to the data center and the target computer system. After the target computer system is accessed or serviced, the computer systems in the vicinity of the target computer system or along the pathway between the entrance to the data center and the target computer system can be returned to their original state.

Description:
TECHNICAL FIELD 
     The present disclosure relates generally to computer systems and information handling systems, and, more particularly, to a system and method for the temperature management of a data center. 
     BACKGROUND 
     As the value and use of information continues to increase, individuals and businesses seek additional ways to process and store information. One option available to these users is an information handling system. An information handling system generally processes, compiles, stores, and/or communicates information or data for business, personal, or other purposes thereby allowing users to take advantage of the value of the information. Because technology and information handling needs and requirements vary between different users or applications, information handling systems may vary with respect to the type of information handled; the methods for handling the information; the methods for processing, storing or communicating the information; the amount of information processed, stored, or communicated; and the speed and efficiency with which the information is processed, stored, or communicated. The variations in information handling systems allow for information handling systems to be general or configured for a specific user or specific use such as financial transaction processing, airline reservations, enterprise data storage, or global communications. In addition, information handling systems may include or comprise a variety of hardware and software components that may be configured to process, store, and communicate information and may include one or more computer systems, data storage systems, and networking systems. 
     A group of information handling systems may be included within a data center. A data center will typically include multiple computers systems, which may be arranged in racks. The racks are typically arranged in rows. The power consumed by each computer system is a significant factor in the total amount of power consumed by the data center as a whole. As computer systems have become more powerful, the computer systems have tended to generate more heat, thereby requiring larger fans for generating airflow within the interior of the computer systems for the purpose of cooling the computer systems. Minimizing power consumption requires operating the fans of the computer systems at the lowest speed that nevertheless results in the computer systems operating within their thermal limits. Running a large group of computer systems at the outer range of their thermal limits generates an excessive amount of heat in the interior of the data center, making it difficult for operators or maintenance centers works to work comfortably in the data center. 
     SUMMARY 
     In accordance with the present disclosure, a system and method for managing the temperature of a data center is disclosed in which a target computer system is identified. The target computer system is the system that requires access or service. The operation of the computer systems in the vicinity of the target computer system is modified to reduce the temperature in the vicinity of the target computer system or along the pathway between the entrance to the data center and the target computer system. After the target computer system is accessed or serviced, the computer systems in the vicinity of the target computer system or along the pathway between the entrance to the data center and the target computer system can be returned to their original state. 
     The system and method disclosed herein is technically advantageous because the system and method allows the servers of the data center to be operated in a mode that involves a moderate level of heat output, while reducing the energy costs of the data center. When a server in the data center needs to be serviced, the fan speed of the servers in a maintenance path is increased, thereby temporarily decreasing the temperature in the maintenance path so that the affected server can be serviced by a technician. The system and method thereby achieves a dynamic balance between controlling energy consumption and creating an temporary and acceptable work environment. Other technical advantages will be apparent to those of ordinary skill in the art in view of the following specification, claims, and drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A more complete understanding of the present embodiments and advantages thereof may be acquired by referring to the following description taken in conjunction with the accompanying drawings, in which like reference numbers indicate like features, and wherein: 
         FIG. 1  is a side view of the racks of a data center; 
         FIG. 2  is top view of the racks of a data center; 
         FIG. 3  is a block diagram of the data architecture of a temperature management system; 
         FIG. 4  is a flow diagram of a series of method steps for identifying and placing a set of servers in reduced temperature mode to facilitate the servicing of one or more servers in a data center; and 
         FIG. 5  is a flow diagram of a series of method steps for managing the transition of virtual machines in a data center to manage the temperature of a data center and control access to the data center. 
     
    
    
     DETAILED DESCRIPTION 
     For purposes of this disclosure, an information handling system may include any instrumentality or aggregate of instrumentalities operable to compute, classify, process, transmit, receive, retrieve, originate, switch, store, display, manifest, detect, record, reproduce, handle, or utilize any form of information, intelligence, or data for business, scientific, control, or other purposes. For example, an information handling system may be a personal computer, a network storage device, or any other suitable device and may vary in size, shape, performance, functionality, and price. The information handling system may include random access memory (RAM), one or more processing resources such as a central processing unit (CPU) or hardware or software control logic, ROM, and/or other types of nonvolatile memory. Additional components of the information handling system may include one or more disk drives, one or more network ports for communication with external devices as well as various input and output (I/O) devices, such as a keyboard, a mouse, and a video display. The information handling system may also include one or more buses operable to transmit communications between the various hardware components. 
     A plurality of information handling systems may be housed in a data center. Shown in  FIG. 1  is a side view of the racks  10  of a data center. Each rack typically includes several computer systems or servers. The computer systems or servers may comprise communications servers, such as web servers. The computer systems may also include storage servers, which provide an interface between a client and storage. The computer systems may also comprise computational units, which provide a computational power that may be distributed across several computer systems. As indicated in  FIG. 1 , the racks  10  may be arranged so that racks are placed in a back-to-back configuration to promote the use of cool aisles  12  and hot aisles  14 . In the example of  FIG. 1 , cooled air is distributed to the racks through an air inlet  11 . The cooler air in air inlet is passed into a cool aisle  12 . From the cool aisle  12 , the air enters the racks  10  and exits racks  10  into a hot aisle  14 . Air passes through hot aisle  14  in an upward direction and away from racks  10 . In the example of  FIG. 1 , the aisle between racks  10   a  and  10   b  is a hot aisle, and the aisle between racks  10   c  and  10   d  is a hot aisle. The aisle between racks  10   b  and  10   c  is a cool aisle. In operation, if it is determined that a computer system of rack  10   c  need servicing, the fans of the computer systems of rack  10   c  would be increased in speed, thereby reducing the temperature in the vicinity of rack  10   c , including the temperature in the hot aisle  14  between rack  10   c  and rack  10   d.    
     Shown in  FIG. 2  is a top view of the data center of  FIG. 1 , including racks  10 . A hot aisle  14  is formed between racks  10   a  and  10   b , and a second hot aisle  14  is formed between racks  10   c  and  10   d . A cool aisle is formed between racks  10   b  and  10   c . In the data center, the computer system that needs to be serviced is identified at  13 . Before a human operator enters the data center to service computer system  13 , the fans of the computer systems the vicinity of computer system  13  are increased in speed, causing the temperature in the area in the vicinity of computer system to decrease. Shown in  FIG. 2  is a bubble of cooler air  15  in the hot aisle between rack  10   c  and  10   d . This bubble of cooler air is formed by increasing the speed of the fans in racks  10   c  and  10   d  nearest computer system  13 . Because of the existence of the bubble of cooler air, a human operator can work in the vicinity of computer system  13 . When the work of the human operator on computer system  10  is complete, the speed of the fans in the vicinity of computer system  10  can be decreased. 
     Shown in  FIG. 3  is a block diagram of the data architecture of the temperature management system described herein. The architecture of the system includes a ventilation management application  16 , which receives data from a facility model  17  and a database  18  of server locations. Ventilation management application  16  communicates with data center  19 . When data center  19  identifies that a server in the data center needs to be serviced, the ventilation management application identifies the location of the server through server location database  18 . The server location database identifies the unique location of the server. The location of the server may be uniquely identified through a set of GPS coordinates or by identifying the location of the server within a particular data center. Once the location of the server has been identified, the validation management application reads the facility model  17  to identify the servers whose fan speeds should be increased to accommodate a human operator in the vicinity of the server that must serviced. The identification of servers whose fan speeds must be increased includes not only the servers in the vicinity of the affected server, but also those servers that lie in the walkway between the door of the data center and the affected server. Thus, to accommodate a human operator in the data center, it may be necessary to reduce the temperature in the vicinity of the affected server as well as the temperature of the path that the human operator must take to reach the affected server. With respect to the path of the human operator through the data center, it is anticipated that the validation management application can also trigger lights or other indicators that would signal to the human operator the best and coolest path to take to reach the affected server. 
       FIG. 4  is a flow diagram of a series of method steps for identifying and placing a set of servers in reduced temperature mode to facilitate the servicing of one or more servers in a data center. At step  20 , ventilation management application  16  receives a notification that a server or servers in the data centers require access. The servers requiring access are referred to as target servers The notification to the ventilation management application may be automatically generated by the target servers and transmitted to the ventilation management application. The notice will identify the target server or servers and the fault that occurred in the servers. Alternatively, an operator may manually notify the ventilation management application of the identity of the target servers. At step  22 , the ventilation management application identifies a path through the data center to reach the target servers. As described with reference to  FIG. 3 , the ventilation management application determines the maintenance path by accessing the server location database  18  and the data center facility model  17 . At step  24 , the ventilation management application accesses the server location database and the data center facility model to identify the servers adjacent to and along the maintenance path. The target servers and the servers adjacent to and along the maintenance path are referenced to herein as the identified servers. The identified servers are placed in a reduced temperature mode at step  26 . The identified servers are placed in a reduced temperature mode by increasing the fan speed of the fans in the identified servers. The fan speed may be increased through an integrated data center management application that is able to access and manage the fan speed of servers of the data center. At step  28  of  FIG. 4 , the operator accesses the data center by traversing the maintenance path. When the operator reaches the target server or target servers, the operator makes the necessary repairs to the target server. When the data center access is complete at step  30 , the speed of the fans of the identified servers are returned to normal operation at step  32  by reducing the speed of the fans. 
     Shown in  FIG. 5  is a flow diagram that concerns the management of virtualization machine in a data center to manage the temperature of a data center and control access to the data center. At step  24 , the servers in the maintenance path are identified. The step of identifying the servers in the maintenance path is performed according to the steps outlined in steps  20 ,  22 , and  24  of  FIG. 4 . Each server may include multiple virtual machines. A virtual machine is a software construct that simulates an instance of an operating system and associated firmware. Once the identified servers in the maintenance path are identified, the virtual machines on the identified servers are transitioned away from the identified servers so that the virtual machines execute on servers that are not in the maintenance path of the target server or servers. The transition of the virtual machines away from the identified servers, reduces the computational load of the identified servers. Because the computational load on these servers is reduced, the heat generated by the servers is likewise reduced. At step  28 , an operator access the target servers data center by traversing the maintenance path. Following the completion of the data center access at step  30 , the virtual machines are returned to the identified servers at step  48 . After the virtual machines are returned to their identified servers, the identified servers are returned to their normal operation and heat generation. 
     The system and method described herein is advantageous in that it allows the servers of the data center to be operated in a mode that involves a moderate level of heat output, while reducing the energy costs of the data center. When a server in the data center needs to be serviced, the fan speed of the servers in a maintenance path is increased, thereby temporarily decreasing the temperature in the maintenance path so that the affected server can be serviced. Although the system and method has been described herein with reference to servers, it should be understood that the system and method described herein can be employed with regard to any computing system. Although the present disclosure has been described in detail, it should be understood that various changes, substitutions, and alterations can be made hereto without departing from the spirit and the scope of the invention as defined by the appended claims.