KR101959407B1 - Apparatus and method for power management of multi-server system, and recording medium thereof - Google Patents

Abstract

A power management apparatus, a power management method, and a recording medium of a multi-server system capable of drastically reducing energy consumption of a multi-server system while maintaining service quality are provided. The power management method of a multi-server system according to an exemplary embodiment of the present invention includes storing data files in server groups such that the number of server groups in which data files are stored differs according to the popularity level of the data files; And adjusting the number of server groups powered by the load level of the server groups due to the request for the data files.

Description

TECHNICAL FIELD [0001] The present invention relates to a power management apparatus, a power management method, and a recording medium for a multi-server system,

The present invention relates to a power management device, a power management method, and a recording medium of a multi-server system capable of drastically reducing energy consumption of a multi-server system while maintaining service quality.

Recently, demand for Internet-based large-capacity data services such as Internet protocol television (IPTV) and user created contents (UCC) is increasing rapidly. The need for large-scale data centers is growing in order to accommodate the service demands of such Internet-based large-volume data. These large data centers consume enormous amounts of energy to run numerous servers and equipment. Current data center power consumption for multimedia services accounts for about 3% of global power generation. It is also estimated that power consumption in the data center will double every five years, consuming around 8% of the world's electricity production by 2020. Reducing energy consumption in the data center is an important issue, but simply reducing service capacity to conserve energy can lead to degradation of service quality.

Because video is the largest data type, it is typically the highest data type supported by the data center. For these video services, several methods have been proposed to reduce energy consumption while minimizing degradation in playback quality. For example, a method for supporting load balancing between storage devices has been proposed to improve the system performance of a multimedia server. This is to increase the overall system performance by maximizing the utilization of the entire disk by evenly distributing the load across all disks. For example, each video file is divided into small blocks and distributed across all or multiple disks. When there is a video playback request, all the disks are accessed simultaneously to access each video, and load balancing is provided between the disks by preventing the load from concentrating on a specific disk. However, the conventional method does not efficiently manage the power of a plurality of servers according to load conditions of the servers.

It is an object of the present invention to provide a power management apparatus, a power management method, and a recording medium of a new multi-server system capable of drastically reducing energy consumption of a multi-server system while maintaining service quality.

The problems to be solved by the present invention are not limited to the above-mentioned problems. Other technical subjects not mentioned will be apparent to those skilled in the art from the description below.

According to an aspect of the present invention, there is provided a power management method for a multi-server system, the method comprising: storing the data files in server groups such that the number of server groups in which the data files are stored differs according to a popularity level of the data files; And adjusting the number of server groups to which power is supplied according to a load level of the server groups due to a request for the data files.

Wherein the storing the data files in the server groups comprises: determining the number of server groups based on a maximum load and a minimum load of the multi-server system; Classifying the data files into data groups corresponding to the number of server groups according to a popularity level of the data files; And storing the data files in the server groups in units of the data groups.

Wherein the number of server groups in which the data file is stored decreases as the popularity level of the data group to which the data file belongs is smaller and the number of the data groups stored in the server groups May be different for each of the server groups.

The power management method of a multi-server system according to claim 1, wherein when a first data file of the data files is requested, the power management method of the multi- And allocating a request for the first data file to the server group storing the least data.

Wherein the step of adjusting the number of server groups to which power is supplied comprises the steps of: determining a load of a first server group storing the smallest number of data groups among server groups to which power is supplied, Comparing the sum of available service capacities of the second server group; Distributing one or more data groups stored in the first server group to the second server group when the sum of the available service capacities is larger than the load of the first server group; And terminating the power supply to the first server group after the at least one data group is distributed to the second server group.

The step of adjusting the number of server groups to which the power is supplied may include comparing the total sum of the available service capacities of the third server groups to which power is supplied among the server groups to a predetermined threshold value; Supplying power to a fourth server group storing the largest number of data groups among the server groups to which power is not supplied when the sum of the available service capacities of the third server groups is smaller than the threshold value; And allocating a request for a data file corresponding to a data group stored in the fourth server group among requests in service in the third server groups to the fourth server group.

According to another aspect of the present invention, there is provided a computer-readable recording medium on which a program for executing a power management method of the multi-server system is recorded.

According to another aspect of the present invention, there is provided a data distribution system including: a data arrangement unit for storing the data files in server groups so that the number of server groups in which the data files are stored differs according to a popularity level of the data files; And a power management unit for adjusting the number of server groups to which power is supplied according to a load level of the server groups due to a request for the data files.

The power management apparatus of the multi-server system includes: a server group determination unit for determining the number of server groups based on a maximum load and a minimum load of the multi-server system; And a data group determination unit for classifying the data files into data groups corresponding to the number of the server groups according to the popularity level of the data files.

The data arrangement unit may store the data files in the server groups on a data group basis.

As the popularity level of the data group to which the data file belongs is lower, the power management apparatus of the multi-server system decreases the number of server groups in which the data file is stored among the server groups and is stored in the server groups The number of data groups may be different for each of the server groups.

When a first data file of the data files is requested, the server group storing the data group of the lowest popularity level lower than the first data file among the server groups storing the first data file, A request for one data file may be assigned.

Wherein the power management unit includes a load of a first server group storing a smallest number of data groups among server groups to which power is supplied and a load of an available service capacity of one or more second server groups excluding the first server group A first judgment unit for comparing the total sum; A data distribution unit for distributing one or more data groups stored in the first server group to the second server group when the sum of the available service capacities is larger than the load of the first server group; And terminating power supply to the first server group when the one or more data groups stored in the first server group are allocated to the second server group.

The power management unit may further include a second determination unit that compares a sum of available service capacities of server groups to which power is supplied, with a predetermined threshold value.

The server group power control unit stores the largest number of data groups among the server groups to which power is not supplied when the sum of the available service capacities of the third server groups to which power is supplied is smaller than the threshold value Lt; RTI ID = 0.0 > 4 < / RTI >

The power management unit may further include a data allocator for allocating a request corresponding to a data group stored in the fourth server group among requests in service in the third server groups to the fourth server group have.

According to the embodiments of the present invention, a power management apparatus, a power management method, and a recording medium of a multi-server system capable of drastically reducing energy consumption of a multi-server system while maintaining service quality are provided.

The effects of the present invention are not limited to the effects described above. Unless stated, the effects will be apparent to those skilled in the art from the description and the accompanying drawings.

1 is a configuration diagram of a power management apparatus of a multi-server system according to an embodiment of the present invention.
2 is a conceptual diagram showing data groups stored in server groups according to an embodiment of the present invention.
3 is a configuration diagram of a power management unit constituting a power management apparatus of a multi-server system according to an embodiment of the present invention.
FIG. 4 is a flow chart illustrating controlling power of server groups according to an embodiment of the present invention.
5 is an exemplary diagram illustrating an operation for shutting down power of a server group according to an embodiment of the present invention.
6 is an exemplary diagram illustrating an operation of turning on a server group according to an embodiment of the present invention.

Other advantages and features of the present invention and methods of achieving them will be apparent by referring to the embodiments described hereinafter in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and the present invention is only defined by the scope of the claims. Although not defined, all terms (including technical or scientific terms) used herein have the same meaning as commonly accepted by the generic art in the prior art to which this invention belongs. A general description of known configurations may be omitted so as not to obscure the gist of the present invention. In the drawings of the present invention, the same reference numerals are used as many as possible for the same or corresponding configurations. To facilitate understanding of the present invention, some configurations in the figures may be shown somewhat exaggerated or reduced.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises", "having", or "having" are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, parts, or combinations thereof, whether or not explicitly described or implied by the accompanying claims.

Used throughout this specification may refer to a hardware component such as, for example, software, FPGA or ASIC, as a unit for processing at least one function or operation. However, "to" is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors.

As an example, the term '~' includes components such as software components, object-oriented software components, class components and task components, and processes, functions, attributes, procedures, Routines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided by the components and components may be performed separately by a plurality of components and components, or may be integrated with other additional components.

In the present invention, in providing a service such as multimedia (e.g., video) by a multi-server system including a plurality of servers, it is possible to remarkably reduce the total energy consumption of the multi- The present invention relates to a power management apparatus, a power management method, and a recording medium.

A method for managing a power of a multi-server system according to an embodiment of the present invention includes the steps of: (a) storing data files in server groups such that the number of server groups storing data files is different according to the popularity level of the data files; and b) adjusting the number of server groups powered by the load level of the server groups due to the request for the data files.

In one embodiment of the present invention, when the sum of the available service capacities of the server groups different from the load of the specific server group among the server groups is large, the load of the specific server group is concentrated in the other server groups, Energy savings can be dramatically saved by shutting down server groups immediately.

In one embodiment of the present invention, the number of server groups can be determined based on the maximum load and the minimum load of the multi-server system in order to prevent deterioration of the service quality due to termination of operation of the server group. In addition, the number of server groups that actually store data files among the server groups can be determined for each data file based on the popularity level of the data files so that the data requests can be evenly distributed to the entire system.

According to the embodiment of the present invention, since the number of server groups in which data files are stored is adjusted according to the popularity of data files and the power is turned off or turned on for each server group according to a load condition of the current multi-server system, Without sacrificing service quality, the energy consumption of a muller server system can be significantly reduced.

1 is a configuration diagram of a power management apparatus of a multi-server system according to an embodiment of the present invention. 1, the power management apparatus 100 of the multi-server system includes a server group determination unit 120, a data group determination unit 140, a data arrangement unit 160, a power management unit 180, As shown in FIG.

The server group determination unit 120 can determine the number of server groups based on the maximum load and the minimum load of the multi-server system. For example, the maximum load of the multi-server system may be the sum of the loads allocated to the servers of the multi-server system at the time when the number of data requests has increased to the maximum. In addition, the minimum load of the multi-server system may be the sum of the loads allocated to the servers at the time when the number of data requests is minimum. The load of the multi-server system can be calculated based on, for example, the number of video playback requests, the total file size of the videos requested to be played back, and the like.

In one embodiment, the server group determination unit 120 may determine the total number of server groups based on the difference between the maximum load and the minimum load of the multi-server system or the ratio of the maximum load to the minimum load. After the servers are grouped, the server group determining unit 120 determines that the load of the multi-server system is the maximum at the time when the load of the multi-server system is the maximum And the ratio of the minimum time point can be used to determine the number of server groups.

That is, only one server group storing all the video files is turned on at the time when the total load of the multi-server system is minimum, and at this time, . Also, at the time when the total load of the multi-server system is the maximum, all the server groups can be powered on. In one embodiment, the server group determination unit 120 may calculate the number of server groups according to Equation (1) below.

[Formula 1]

In Equation 1, g is the number of server groups, and L _max and L _min are the maximum load and minimum load of the multi-server system, respectively. In order to maximize the energy saving effect, the server group determination unit 120 may periodically check the total number of video playback requests and change the number of server groups.

The data group determination unit 140 may classify the data files into data groups as many as the number of server groups according to the popularity level of the data files. The data file may be provided, for example, as a multimedia file such as a video file, but is not limited thereto. In one embodiment, the popularity level may be computed based on the playback request frequency for the data file.

The data arrangement unit 160 may store the data files in the server groups so that the number of server groups in which the data files are stored differs according to the popularity level of the data files. In one embodiment, depending on the popularity level, each data file can be determined to be stored in several server groups. Data files with high popularity are stored in a relatively large number of server groups because of high number of requests, while low-popularity data files are stored in a relatively small number of server groups.

Accordingly, the lower the popularity level of the data group to which the data file belongs, the smaller the number of server groups in which the data file is stored, and conversely, the number of server groups in which the data file having the highest popularity level is stored. The number of data groups stored in each of the server groups may be determined differently for each server group so that the energy saving effect of the multi-server system is enhanced.

More specifically, in order to determine a data file to be stored in each server group, the number of data files of the data group can be obtained first. When the total number of data files is V and the number of server groups is determined as g, the number of data files V _g of one data group can be calculated according to the following equation 2, for example.

[Formula 2]

All the data files are sorted according to the popularity level, and then assigned to each data group of V _g , and classified into data groups of the number of server groups (g). Then, the number of server groups in which each data file is stored is determined according to the popularity so that the reproduction requests can be evenly distributed to the entire system.

FIG. 2 is a diagram illustrating data groups stored in server groups according to an embodiment of the present invention. FIG. 2 is a diagram illustrating which data groups are arranged in each server group. 1 and 2, the data arrangement unit 160 arranges the data files in the server groups Gs ₁ , Gs ₂ , ..., Gs in units of data groups Gv ₁ , Gv ₂ , ..., Gv _g . ., Gs _g ). The data group Gv ₁ may be a data group having the highest level of popularity (for example, the reproduction request frequency), and Gv _g may be the data group having the lowest level of popularity.

if the i-th data group is Gv _i (i = 1, 2, 3, ..., g) and the j-th server group is Gs _j (i = th data group may be stored in (g-i + 1) server groups Gs ₁ , Gs ₂ , Gs ₃ , ..., Gs _{g-i + 1} , respectively. For example, while the most popular are respectively stored in the higher data group for Gv ₁ g of all server groups ₍₁ Gs, Gs _2, ..., Gs _g), if one of most popular low data group Gv _g Is stored only in the server group Gs ₁ of the server group Gs ₁ . The remaining data files also determine the server group to be stored according to their popularity.

According to the present embodiment, different numbers of data groups are stored for each server group. In one embodiment, a server group having a high number stores only data groups having relatively high popularity, while storing data groups having low popularity as the server group number is lowered.

For example, the first server group Gs ₁ stores all of the g data groups Gv ₁ , Gv ₂ , ..., Gv _g , and the last server group Gs _g stores the highest one and storing only the data group (Gv _1), i the second group of servers (Gs _i) has a high level of popularity with the order of (g-i + 1) number of data groups _{(Gv 1, Gv 2, ...} , Gv g - _{i + 1} ). Thus, a group of servers with a higher sequence number can only be assigned a high-data request, while a group with a lower sequence number can process a less popular data request.

In one embodiment, when a request for a first data file out of the data files arrives to ensure quality of service for data of low popularity, the highest order among the server groups in which the first data file is stored It is possible to distribute the load of the entire system by allocating a reproduction request for the first data file in a round-robin manner from a server group in which the data group of the popularity level lower than that of the first data file is stored the least.

In other words, when playback is requested for a video belonging to the data group Gv _i having the popularity level _i , the server groups (Gs ₁ , Gs ₂ , ..., Gs _{g -i + 1} ) The playback request is assigned to the server group Gs _{g -i + 1} having the highest order. If the power of the server group is terminated, the playback request may be assigned to the server group having the highest number among the remaining server groups to which power is supplied. Therefore, it is possible to allocate a replay request for another data file having a lower popularity level to the remaining server groups (Gs ₁ , Gs ₂ , ..., Gs _{g -i} ).

The system can periodically check the load of the entire video request to dynamically determine the number of server groups and update the information of the server group in which each video will be stored according to the popularity of the videos. In addition, each server group can be copied from another server group if the assigned video is not in its own server group, and deleted if the previously stored video is no longer needed.

The power management unit 180 may adjust the number of server groups to which power is supplied according to the load level of the server groups due to the request for the data files. That is, the power management unit 180 may terminate the power supply to the specific server group or start the power supply to the server group according to the load state of the server groups.

3 is a configuration diagram of a power management unit constituting a power management apparatus of a multi-server system according to an embodiment of the present invention. 3, the power management unit 180 includes a first determination unit 181, a second determination unit 182, a data distribution unit 183, a server group power control unit 184, and a data allocation unit 185 And the like.

The first determination unit 181 determines whether or not the load of the first server group storing the smallest number of data groups among the server groups to which power is supplied and the load of one or more second server groups other than the first server group Compare the sum of capacities.

The data distribution unit 183 may distribute one or more data groups stored in the first server group to the one or more second server groups if the sum of the available service capacities of the one or more second server groups is larger than the load of the first server group, Groups.

The server group power control unit 184 can immediately terminate the power supply to the first server group after one or more data groups stored in the first server group are distributed to the one or more second server groups.

The second determination unit 182 may compare the total sum of the available service capacities of the third server groups to which power is currently supplied to a predetermined threshold value.

The server group power control unit 184 controls power supply to the fourth server group storing a smaller number of data groups than the third server groups when the sum of the available service capacities of the third server groups is smaller than the threshold value . ≪ / RTI >

The data allocation unit 185 may allocate a request corresponding to the data group stored in the fourth server group among the requests in service in the third server groups to the fourth server group.

FIG. 4 is a flow chart illustrating controlling power of server groups according to an embodiment of the present invention. Referring to FIG. 4, in order to control the power of the server group, available capacity of each server group and load of a specific server group are calculated (S10).

Let us denote the available service capacity of the server group and the current load as Ug _i and Lg _i , respectively, and let the current sequential server group among currently powered on server groups be 'cur' the condition for turning off the power of _cur is expressed by Equation 3 below.

[Formula 3]

That is, the load (Lg _cur ) of the first server group (Gs _cur ) storing the smallest number of data groups among the server groups to which power is supplied and the load (Ug ₁ + Ug ₂ + ... + Ug _{cur -1} ) of the available service capacities of the remaining second server groups (Gs ₁ , Gs ₂ , ..., Gs _{cur -1} ) S20). If the sum of the available service capacities of the second server groups is larger than the load of the first server group, one or more data groups stored in the first server group are allocated to the second server group (S30) The power supply to the first server group Gs _cur is immediately terminated (S40).

5 is an exemplary diagram illustrating an operation for shutting down power of a server group according to an embodiment of the present invention. It is assumed that power is supplied to the server groups (Gs ₁ , Gs ₂ , ..., Gs _cur ) of cur curs (cur is an integer of 1 or more). Referring to Figures 4 and 5, cur-th server group requests reproduction of the entire data file that is requested to Gs _cur more server groups the other server groups, except for Gs _cur, that is, from Gs ₁ Gs _{cur -} available from ₁ service capacity _{Ug i (i = 1,2, ...} , cur-1) remaining (cur-1) to the load (Lg _cur) of the face (S20), cur second server group (Gs _cur) the sum of the larger of Since it is possible to serve in the server groups, the power of the cur th server group (Gs _cur ) is terminated in order to save energy (S40). The data requests in service in the server group Gs _cur to be powered off can be distributed equally to the remaining server groups Gs ₁ , Gs ₂ , ..., Gs _cur-1 to continue to provide services (S 30, S 40 ).

If the amount of the available service of the third server groups, which are currently powered on, increases due to an increase in data requests, the power of the fourth server group, which is not supplied with power, is further turned on. Assuming that a threshold for turning on the power of the server group is U _th , the condition for power addition of the fourth server group (G s _{cur + 1} ) is expressed by Equation (4) below.

[Formula 4]

6 is an exemplary diagram illustrating an operation of turning on a server group according to an embodiment of the present invention. Referring to FIGS. 4 and 6, the power management unit compares the sum of available service capacities of the third server groups Gs ₁ , Gs ₂ ,..., Gs _cur currently powered on with a predetermined threshold value (S50). When the total sum of the available service capacities of the third server groups to which power is supplied is smaller than the threshold value, a smaller number of data groups than the third server groups are stored, and power is not supplied Power is supplied to the fourth server group (the server group storing the data group having the lowest popularity level among the server groups to which no power is supplied) storing the largest data group among the server groups (S60) A request for a data file corresponding to a data group stored in the fourth server group among the requests in service in the third server groups is allocated to the fourth server group (S70) .

In other words, when the sum of the available service capacities of all the third server groups (Gs ₁ , Gs ₂ , ..., Gs _cur ) on which the power is currently turned on is smaller than the threshold value (U _th ) The power of the fourth server group (Gs _{cur + 1} ) of the order is turned on. the fourth server group of the (cur + 1) -th order corresponds to the data file stored in the fourth server group among the service requests in the third server groups of the existing curs, ₁ , Gs ₂ , ..., Gs _cur ) to continue to provide services.

According to the present embodiment, since the server group in which the data file is stored is adjusted according to the load of the current system and the popularity of the data files and the power of the specific server group is shut down or turned on for each server group, While maintaining a constant level of service quality for a multi-server system.

The method according to an embodiment of the present invention can be realized in a general-purpose digital computer that can be created as a program that can be executed by a computer and operates the program using a computer-readable recording medium. The computer readable recording medium may be a volatile memory such as SRAM (Static RAM), DRAM (Dynamic RAM), SDRAM (Synchronous DRAM), ROM (Read Only Memory), PROM (Programmable ROM), EPROM (Electrically Programmable ROM) Non-volatile memory such as EEPROM (Electrically Erasable and Programmable ROM), flash memory device, Phase-change RAM (PRAM), Magnetic RAM (MRAM), Resistive RAM (RRAM), Ferroelectric RAM But are not limited to, optical storage media such as CD ROMs, DVDs, and the like.

It is to be understood that the above-described embodiments are provided to facilitate understanding of the present invention, and do not limit the scope of the present invention, and it is to be understood that various modified embodiments are also within the scope of the present invention. It is to be understood that the technical scope of the present invention should be determined by the technical idea of the claims and the technical scope of protection of the present invention is not limited to the literary description of the claims, To the invention of the invention.

100: Power management device
120: Server group determination unit
140: Data group determination unit
160: Data arrangement unit
180: Power management unit
181:
182:
183: Data distribution unit
184: Server group power control unit
185: Data allocation unit

Claims (14)

Storing the data files in server groups such that the number of server groups in which the data files are stored differs according to the popularity level of the data files;
Adjusting the number of server groups to which power is supplied according to a load level of the server groups due to a request for the data files; And
When a first data file of the data files is requested, the server group storing the data group of the lowest popularity level lower than the first data file among the server groups storing the first data file, 1 < / RTI > data file is allocated. Storing the data files in server groups such that the number of server groups in which the data files are stored differs according to the popularity level of the data files; And
Adjusting the number of server groups to which power is supplied according to a load level of the server groups due to a request for the data files,
Wherein storing the data files in server groups comprises:
Determining a number of the server groups based on a maximum load and a minimum load of the multi-server system;
Classifying the data files into data groups corresponding to the number of server groups according to a popularity level of the data files; And
And storing the data files in the server groups in units of the data groups. 3. The method of claim 2,
The lower the popularity level of the data group to which the data file belongs, the smaller the number of server groups in which the data file is stored,
Wherein the number of the data groups stored in each of the server groups is different for each of the server groups. The method of claim 3,
When a first data file of the data files is requested, the server group storing the data group of the lowest popularity level lower than the first data file among the server groups storing the first data file, 1 < / RTI > data file in accordance with one embodiment of the present invention. Storing the data files in server groups such that the number of server groups in which the data files are stored differs according to the popularity level of the data files; And
Adjusting the number of server groups to which power is supplied according to a load level of the server groups due to a request for the data files,
Wherein the step of adjusting the number of server groups to which the power is supplied comprises:
Comparing the sum of the load of the first server group storing the smallest number of data groups among the server groups supplied with power and the available service capacity of one or more second server groups excluding the first server group ;
Distributing one or more data groups stored in the first server group to the second server group when the sum of the available service capacities is larger than the load of the first server group; And
And terminating powering the first server group after the at least one data group is allocated to the second server group. 6. The method of claim 5,
Wherein the step of adjusting the number of server groups to which the power is supplied comprises:
Comparing the sum of the available service capacities of the third server groups powered on among the server groups with a preset threshold value;
Supplying power to a fourth server group storing the largest number of data groups among the server groups to which power is not supplied when the sum of the available service capacities of the third server groups is smaller than the threshold value; And
And allocating a request for a data file corresponding to a data group stored in the fourth server group among requests in service in the third server groups to the fourth server group Power management methods. A computer-readable recording medium having recorded thereon a program for executing a power management method of a multi-server system according to any one of claims 1 to 6. A data arrangement unit for storing the data files in server groups so that the number of server groups in which the data files are stored differs according to the popularity level of the data files; And
And a power management unit for adjusting the number of server groups to which power is supplied according to a load level of the server groups due to a request for the data files,
When a first data file of the data files is requested, the server group storing the data group of the lowest popularity level lower than the first data file among the server groups storing the first data file, 1 Power management device in a multi-server system that is assigned a request for a data file. A data arrangement unit for storing the data files in server groups so that the number of server groups in which the data files are stored differs according to the popularity level of the data files;
A power management unit for adjusting the number of server groups to which power is supplied according to a load level of the server groups due to a request for the data files;
A server group determination unit for determining the number of server groups based on a maximum load and a minimum load of the multi-server system; And
And a data group determination unit for classifying the data files into data groups corresponding to the number of the server groups according to the popularity level of the data files,
Wherein the data arrangement unit comprises:
And stores the data files in the server groups in units of the data groups. 10. The method of claim 9,
The lower the popularity level of the data group to which the data file belongs, the smaller the number of server groups in which the data file is stored among the server groups,
Wherein the number of the data groups stored in each of the server groups is different for each of the server groups. 11. The method of claim 10,
When a first data file of the data files is requested, the server group storing the data group of the lowest popularity level lower than the first data file among the server groups storing the first data file, 1 Power management device in a multi-server system that is assigned a request for a data file. 12. The method of claim 11,
The power management unit,
A comparison unit for comparing the sum of the load of the first server group storing the smallest number of data groups among the server groups supplied with power and the available service capacity of one or more second server groups excluding the first server group, 1 judgment unit;
A data distribution unit for distributing one or more data groups stored in the first server group to the second server group when the sum of the available service capacities is larger than the load of the first server group; And
And terminating power supply to the first server group when the one or more data groups stored in the first server group are allocated to the second server group. 13. The method of claim 12,
The power management unit,
And a second determination unit for comparing the sum of the available service capacities of the server groups to which power is supplied with a preset threshold value,
Wherein the server group power control unit comprises:
When the sum of the available service capacities of the third server groups to which the power is supplied is less than the threshold value, the fourth server group storing the largest number of data groups among the server groups to which power is not supplied, Power management apparatus of a multi-server system. 14. The method of claim 13,
The power management unit,
And a data allocation unit for allocating a request corresponding to a data group stored in the fourth server group among the requests in service in the third server groups to the fourth server group, Device.

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