JP2009258922A - Multi-point computer management system and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce network traffic between a base point where an operation manager is arranged and a base point where a system is introduced in a system for managing the security measures or use application of a PC in a batch by a thin client. <P>SOLUTION: An OS image management device extracts, when the change of an OS is instructed from a PC for OS maintenance (S1), a difference between an old generation and an instructed new image file (S2), and instructs the duplication of a region to the network storage of a base point system(S3), and transfers the extracted difference to the network storage (S5), and the network storage writes the difference obtained from the OS image management device in the duplicated old generation region (S4), and the OS image management device instructs the management server to change the information of the region on the network storage to be assigned to the diskless PS of the base system to the information of the new generation (S7). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a multi-point computer management system and method, and in particular, OS maintenance technology for a system using a network storage and a thin client terminal in order to facilitate security measures for personal computers (PCs) and application management. The present invention relates to a multipoint computer management system and method.

  FIG. 11 shows a configuration of a conventional iSCSI boot type thin client system.

The iSCSI boot type thin client system shown in the figure is connected to an OS maintenance PC 2 in an area of the iSCSI storage 1 in which an OS such as Windows is stored, and then booted and applied with a security patch. The OS data is updated, and the end user always maintains maintenance such as security patches by starting up the PC by using the updated area (or copying to the updated area) by the diskless PC 3 for the end user. There is a technique in which a PC can be used in a state (see, for example, Patent Documents 1 and 2).
JP 2005-326915 A JP 2006-53732 A

  However, in the conventional iSCSI boot type thin client system, a large amount of network traffic is generated when the OS is managed by the maintenance PC, and it is necessary to arrange an operation manager for each installation site. Between the iSCSI storage and the OS maintenance PC, or between the iSCSI storage and the diskless PC for the end user, the same amount of data access as a storage interface for a PC such as a general SCSI or IDE occurs. When viewed as iSCSI network traffic, a single diskless PC required a bandwidth of several tens of Mbps at the peak. Therefore, conventionally, an iSCSI storage, an OS maintenance PC, and a diskless PC for end users have been installed at the same site. Since the OS maintenance PC needs to be used every day by the operation manager, when the OS maintenance PC is installed at a plurality of sites, the operation manager is arranged at each site.

  The present invention has been made in view of the above points, and provides a multipoint computer management system and method capable of reducing network traffic between a base where an operation manager is placed and a base where the system is introduced. For the purpose.

  FIG. 1 is a principle configuration diagram of the present invention.

The present invention (Claim 1) is a multipoint computer management system that collectively manages security measures and applications used by personal computers (PCs) at multipoint sites.
The operation management center 100 and each base system provided at multiple points are connected by WAN,
The base system 200
A network storage 220 having a generation-specific individual area and replicating the area according to an instruction from the operation management center;
A diskless PC 210 that starts the OS from an individual area allocated by accessing the network storage 220 without using the internal hard disk;
Have
The operation management center 100
An OS maintenance PC 110 that converts the contents of the hard disk into an OS image file in a format that can be booted by a diskless PC, and transfers the OS image file;
A management server 130 that allocates an individual area on the network storage 220 to each diskless PC 210;
When the network storage 220 is instructed to copy the area, and the OS maintenance PC 110 is instructed to change the OS, the difference between the new image file instructed to be the old generation is extracted and stored in the copied area of the network storage. And an OS image management device 120 for writing.

Further, the present invention (Claim 2) is provided in the OS image management apparatus 120.
Area replication instruction means for instructing the network storage 220 to replicate the old generation area;
Image file storage means for holding a plurality of generations of OS image files transferred from the OS maintenance PC 110;
The difference between the new OS image file transferred from the OS maintenance PC and the OS image file of the previous generation stored in the image file storage means is extracted, and the difference is copied to the old generation copied from the network storage 220. Update means for writing to the area,
New generation area update instruction means for instructing the management server 130 to change the allocation to the diskless PC registered in the management server to a new generation area.

The present invention (Claim 3) is a multipoint computer management system that collectively manages security measures and applications used by personal computers (PCs) at multipoint sites.
The operation management center and each base system installed at multiple points are connected by WAN,
The base system is
A first WAN acceleration device for compressing and communicating communication information with the operation management center;
Each generation has a separate area, and the area is replicated according to an instruction from the operation management center, and the maintained new generation OS acquired through the first WAN optimizer is reflected in the replicated area. Network storage,
A diskless PC that boots the OS from a separate area allocated by accessing the network storage without using the internal hard disk;
Have
The operations management center
A second WAN acceleration device that compresses and communicates communication information with the base system;
A management server that allocates a separate area on the network storage to each diskless PC;
Means for directly accessing the network storage without using the built-in hard disk and instructing the replication of the old generation area of the network storage; and means for transferring the maintained new generation OS to the second WAN acceleration device And an OS maintenance PC that instructs the management server to change the allocation to the diskless PC to a new generation area.

The present invention (Claim 4) is a multipoint computer management system that collectively manages security measures and applications used by personal computers (PCs) at multipoint sites.
The operation management center and each base system installed at multiple points are connected to the WAN,
The operations management center
A management server that allocates a separate area on the network storage to each diskless PC;
A general-purpose PC having screen transfer software for communicating only operation signals including keyboard and mouse operations and screen display signals, and means for instructing the management server to rewrite area information of the base system to new generation information; ,
Have
The base system is
Network storage that has individual areas for each generation and replicates the areas according to instructions from the operation management center;
A diskless PC that accesses the network storage notified from the management server without using the internal hard disk, and starts the OS from the allocated individual area;
And a keyboard OS maintenance PC that updates the copied old generation area based on the operation signal and the screen display signal received from the general-purpose PC.

  FIG. 2 is a diagram for explaining the principle of the present invention.

The present invention (Claim 5) is a multipoint computer management method for collectively managing security measures and applications used in personal computers (PCs) at multipoint sites.
In a system in which an operation management center having an OS maintenance PC, an OS image management apparatus and a management server, a diskless PC and a network storage, and each base system provided at multiple points are connected by a WAN,
In the OS maintenance PC of the operation center, the contents of the hard disk are converted into an OS image file in a format that can be booted by the diskless PC, and transferred to the OS image management apparatus (step 1).
In the OS image management apparatus, when an OS change is instructed from the OS maintenance PC, the difference between the old generation and the new image file instructed is extracted (step 2).
Instruct the network storage of the base system to copy the area (Step 3)
The network storage of the base system duplicates the area of the previous generation (Step 4)
The OS image management apparatus writes the extracted difference into the copied old generation area (steps 5 and 6).
The OS image management apparatus instructs the management server to change the information of the area on the network storage to be allocated to the diskless PC of the base system to the new generation information (Step 7).

The present invention (Claim 6) is a multipoint computer management method for collectively managing security measures and applications used in personal computers (PCs) at multipoint sites.
An operation management center having an OS maintenance PC, a first WAN acceleration device and a management server, and a second WAN acceleration device, a network storage and a diskless PC, and each base system provided at multiple points. In a system connected by WAN,
In the OS maintenance PC of the operation management center, directly access the network storage of the base system without using the internal hard disk, and instruct the replication of the previous generation area of the network storage,
Network storage replicates the previous generation area,
In the OS maintenance PC, the new generation OS is transferred to the first WAN acceleration device, and the first WAN acceleration device compresses the new generation OS to increase the second WAN acceleration of the base system. To the device,
The network storage writes the new generation OS acquired via the second WAN acceleration device to the copied old generation area,
In the OS maintenance PC, the management server is instructed to change the information of the area on the network storage to be allocated to the diskless PC of the base system to the new generation information.

The present invention (Claim 7) is a multipoint computer management system that collectively manages security measures and applications used by personal computers (PCs) at multipoint sites.
In a system in which an operation management center having a general-purpose PC and a management server, an OS maintenance PC, a network storage and a diskless PC, and each base system provided at multiple points is connected to the WAN,
In the general-purpose PC of the operation management center, instruct the network storage of the base system to replicate the old generation area,
In network storage, copy the old generation area,
In a general-purpose PC, the built-in screen transfer software sends operation signals including keyboard and mouse operations and screen display signals to the OS maintenance PC of the base system.
The OS maintenance PC transfers operation signals and screen display signals to the network storage,
In network storage, update the old generation area copied based on the operation signal and screen display signal to the new generation area,
The general-purpose PC instructs the management server to change the area information on the network storage to be allocated to the diskless PC of the base system to the new generation information.

  As described above, according to the present invention, it is possible to reduce the cost of the network line by reducing the network traffic between the site where the operation manager is arranged and the site where the system is introduced.

  In addition, even if it has been closed and installed at the same site due to network traffic restrictions so far, it is possible to separate the site where the operation manager is allocated, so when installing the system at multiple sites As a result, it is possible to reduce the cost of system operation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the following embodiment, in an iSCSI boot type thin client system, an example for reducing the network traffic when updating the data of the iSCSI storage by the OS maintenance PC and enabling operation management at another site is described. explain.

[First Embodiment]
FIG. 3 is a configuration diagram of the computer management system when the OS image management apparatus according to the first embodiment of the present invention is installed.

  The system shown in FIG. 1 includes an operation management center 100 and a plurality of bases A, B, and C.

  The operation management center 100 includes an OS maintenance PC 110, an OS image management apparatus 120, and a management server 130.

  Each base system includes a diskless PC 210 and a network storage 220.

  The network storage 220 at the site A has generation individual storage areas 221 and 222 for each generation, and replicates individual generation areas in accordance with instructions from the operation management center. For example, the area 221 of the current generation (N-1) is set as the area 222 of the next generation (N), and the area 222 is updated with the difference information.

  The diskless PC 210 at the site A directly accesses the network storage 220 without using the built-in hard disk and starts up the OS from an individual area allocated from the management server 120 of the operation management center 100.

  The OS maintenance PC 110 of the operation management center 100 converts the contents of the hard disk into an OS image file in a format bootable by the diskless PC 210 and transfers the OS image file to the OS image management apparatus 120.

  The management server 130 of the operation management center 100 allocates an individual area on the network storage 220 to the diskless PC 210 at each site.

  The OS image management apparatus 120 of the operation management center 100 has the configuration shown in FIG.

  The OS image management apparatus 120 includes an image file storage unit 121, an image file reception unit 122, an area duplication instruction unit 123, a block level read / write (R / W) unit 124, a difference extraction unit 125, and an area change instruction unit 127. .

  The image file receiving unit 122 holds a plurality of generations of OS image files transferred from the OS maintenance PC 110 in the image file storage unit 121.

  The image file storage unit 121 stores an image file for each generation.

  The area duplication instruction unit 123 instructs the network storage 220 to duplicate the area.

  The difference extraction unit 125 extracts differences between generations of OS image files in the image file storage unit 121 at a block level.

  The block level R / W unit 124 writes the difference between the generations of the OS image file extracted by the difference extraction unit 125 to the old generation area on the network storage 220 or a copy thereof at the block level and performs a new process. Update to the generation area. In the present embodiment, it is assumed that the difference is written into the copied area.

  When the update process to the new generation is completed, the area change instruction unit 127 changes the allocation to the corresponding diskless PC registered on the management server 130 to the new generation area.

  Processing when changing the OS in the above configuration will be described.

  FIG. 4 is a flowchart of the system operation in the first embodiment of the present invention, and FIG. 5 shows a processing sequence of the method for installing the OS image management apparatus in the first embodiment of the present invention. Each step number in FIGS. 4 and 5 corresponds.

  Step 101) In the operation management center 100, the OS maintenance PC 110 is activated by the operator.

  Step 102) The OS maintenance PC 110 performs OS maintenance (such as security patch application) based on the operation of the operator.

  Step 103) The function of converting the contents of the hard disk into an OS image file in a format that can be started by the diskless PC 210 is executed in the OS maintenance PC 110 by the operation of the operator.

  Step 104) The OS image file is transferred to the OS image management apparatus 120 in the OS maintenance PC 110 by the operation of the operator.

  Step 105) In response to an operation by the operator, the OS image management apparatus 120 starts a process of updating the old generation area on the network storage 220 to the new generation area.

  Step 106) The image file receiving unit 122 of the OS image management device 120 receives the new generation OS image file from the PC 110 that gets OS maintenance, and stores the new generation OS image file in the image file storage unit 121 on the device 120. To do. The difference extraction unit 125 extracts the difference between the old generation held in the image file storage unit 121 and the new generation OS image file stored by transfer.

  Step 107) The area duplication instruction unit 123 of the OS image management apparatus 120 instructs the network storage 220 to duplicate the area of the old generation storage area 221.

  Step 108) The network storage 220 copies the old generation storage area 221.

  Step 109) The block level R / W unit 124 of the OS image management apparatus 120 writes the extraction result (difference) of Step 106 in units of blocks to the copied old generation area on the network storage 220.

  Step 110) The area change instruction unit 127 of the OS image management apparatus 120 instructs the management server 130 to change the area information (area address, etc.) on the network storage 220 to be allocated to the diskless PC 210 to the new generation information. Do.

  Step 111) The area information on the network storage 220 is requested to the management server 130 by the operation of the end user at the base A (base B, base C), and when the new generation area information is acquired, the diskless PC 210 is activated (diskless PC 210). Boots with a new generation OS image with OS maintenance).

  By constructing the system described above, the network traffic between the network storage 220 and the OS maintenance PC 110 is only the difference information between generations extracted by the OS image management apparatus 120, and thus is reduced as compared with the prior art.

[Second Embodiment]
In the present embodiment, an example in which a WAN acceleration device is used instead of the OS image management device in the first embodiment will be described.

  FIG. 7 is a configuration diagram of a computer management system in which the WAN acceleration device according to the second embodiment of the present invention is installed. In addition, the same code | symbol is attached | subjected to the same component as FIG. 3, and the description is abbreviate | omitted.

  The operation management center 300 shown in FIG. 7 includes an OS maintenance PC 310, a WAN acceleration device 320, and a management server 330 of an iSCSI boot type thin client system. Each base A, B, C has a WAN acceleration device 230 in addition to the configuration of FIG.

  Like the diskless PC 210, the OS maintenance PC 310 directly accesses the network storage 220 without using an internal hard disk and starts up the OS from an individual area allocated from the management server 330.

  The WAN acceleration devices 320 and 230 compress and transmit communication information between the OS maintenance PC 310 and the network storage 220.

  FIG. 8 shows a processing sequence of a method of installing the “WAN acceleration device” in the second exemplary embodiment of the present invention.

  Step 201) When the operator of the operation management center 300 is instructed to copy the old generation area, the OS maintenance PC 310 instructs the network storage 220 to copy the area of the old generation storage area 221.

  Step 202) The network storage 220 duplicates the area of the storage area 221 of the previous generation.

  Step 203) When the OS maintenance PC 310 is turned on by the operator, the OS is started from a copy of the old generation area.

  Step 204) When the OS maintenance PC 310 is instructed by the operator to apply security patches, the OS maintenance PC 310 performs block access to the network storage 220.

  Step 205) Upon obtaining the communication information to be transmitted to the network storage 220, the WAN acceleration device 320 compresses the communication information and transmits it to the network storage 220. As a result, the network storage 220 is subjected to OS maintenance based on the information received by the copy of the old generation area, and becomes a new generation area.

  Step 206) When the operator instructs the area information on the network storage allocated to the diskless PC 210 to be changed to the new generation information, the OS maintenance PC 310 changes the allocation of the area to be activated to the management server 130. .

  Step 207) Request the area information on the network storage 220 from the diskless PC 210 to the management server 330.

  Step 208) The management server 330 allocates an area to be activated to the diskless PC 210.

  Step 209) The diskless PC 210 activates the OS based on the area to be activated.

  By using the WAN acceleration devices 320 and 230 as described above, network traffic is reduced.

[Third Embodiment]
In this embodiment, a case where a general-purpose PC is used in the operation management center is shown. In this embodiment, since a general-purpose PC is used, network traffic is reduced by using screen transfer software instead of using the OS image management apparatus of the first embodiment.

  FIG. 9 shows a system configuration when screen transfer software is used in a general-purpose PC according to the third embodiment of the present invention. In the figure, the same components as those in FIG.

  The operation management center 400 includes a general-purpose PC 410 with a built-in screen software 401 and a management server 430.

  Each base A, B, and C has an OS maintenance PC 240 having the same configuration as that of the second embodiment, in addition to the diskless PC 210 and the network storage 220.

  The screen transfer software 401 built in the general-purpose PC 410 has a function of communicating only the keyboard / mouse operation signal and the screen display signal of the OS maintenance PC 240 of the iSCSI boot thin client system.

  FIG. 10 shows a processing sequence of a method using “screen transfer software” in the third embodiment of the present invention.

  Step 301) The operator of the operation management center 400 instructs the network storage 220 to copy the old generation area via the OS maintenance PC 240.

  Step 302) The network storage 220 copies the old generation area of the generation individual storage area 221.

  Step 303) Upon receiving a power-on instruction from the operator, the OS maintenance PC 240 turns on the power and activates the OS of the copied old generation area.

  Step 304) When the general-purpose PC 410 is instructed by the operator to perform OS maintenance such as security patch application, the built-in screen transfer software 401 uses only the keyboard / mouse operation signal and the screen display signal for OS maintenance. Send to PC 240.

Step 305) The OS maintenance PC 240 receives the signal transmitted from the general-purpose PC 410 and performs block access with the network storage 220.

  Step 306) Thus, the generation individual storage area 221 of the network storage 220 becomes a new generation area by performing OS maintenance on the copy of the old generation area.

  Step 307) The operation administrator instructs the management server 430 to change the information of the area on the network storage 220 allocated to the diskless PC 210 to the new generation information. Thereby, the management server 430 changes the area information.

  Step 308) Request the area information on the network storage 220 from the diskless PC 210 to the management server 430.

  Step 309) The management server 430 notifies the diskless PC 210 of the new generation area information.

  Step 310) The diskless PC 210 receives the new generation area information and activates the OS.

  Even with the above configuration, network traffic can be reduced.

  In each of the above embodiments, the operation of the operation management center device and the operation of each site device are constructed as a program and installed in the operation management center device and the computer used as each site device. It can be executed or distributed via a network.

  Further, the constructed program can be stored in a portable storage medium such as a hard disk, a flexible disk, or a CD-ROM, and can be installed or distributed in a computer.

  The present invention is not limited to the above-described embodiment, and various modifications and applications can be made within the scope of the claims.

  The present invention can be applied to a technique for managing security measures of PCs and applications used.

It is a principle block diagram of this invention. It is a figure for demonstrating the principle of this invention. It is a block diagram of the computer management system at the time of installing the OS image management apparatus in the 1st Embodiment of this invention. It is a block diagram of the OS image management apparatus in the 1st Embodiment of this invention. It is a flowchart of the system operation | movement in the 1st Embodiment of this invention. It is a processing sequence of the method of installing the OS image management apparatus in the first embodiment of the present invention. It is a block diagram of the computer management system at the time of installing the WAN acceleration device in the 2nd Embodiment of this invention. It is a processing sequence of the method of installing the WAN acceleration device in the 2nd Embodiment of this invention. It is a computer management system block diagram at the time of using screen transfer software for the general purpose PC in the 3rd Embodiment of this invention. It is a processing sequence of the method of using the screen transfer software in the 3rd Embodiment of this invention. It is a conventional iSCSI boot type thin client system configuration diagram.

Explanation of symbols

100 Operation Management Center 110 OS Maintenance PC (Personal Computer)
120 OS image management device 121 Image file storage unit 122 Image file reception unit 123 Area duplication instruction unit 124 Block level R / W (read / write) unit 125 Difference extraction unit 127 Area update instruction unit 130 Management server 200 Base system 210 Diskless PC
220 Network storage 240 OS maintenance PC
300 Operation Management Center 310 OS Maintenance PC
320 WAN acceleration device 330 Management server 400 Operation management center 410 General-purpose PC
401 screen transfer software 430 management server

Claims (7)

A multi-point computer management system that collectively manages security measures and applications used in personal computers (PCs) at each multi-point base.
The operation management center and each base system installed at multiple points are connected by WAN (Wide Area Network),
The base system is
A network storage that has an individual area for each generation and replicates the area according to an instruction from the operation management center;
A diskless PC that boots the OS from an individual area allocated by accessing the network storage without using an internal hard disk;
Have
The operation management center is
An OS maintenance PC for converting the contents of the hard disk into an OS image file that can be booted by the diskless PC, and transferring the OS image file;
A management server that allocates an individual area on the network storage to each diskless PC;
When the network storage is instructed to copy the area and the OS maintenance PC is instructed to change the OS, the difference between the old generation and the new image file instructed is extracted, and the network storage is copied. An OS image management device for writing the area,
A multi-point computer management system characterized by comprising: The OS image management device
Area replication instruction means for instructing the network storage to replicate the old generation area;
Image file storage means for holding a plurality of generations of OS image files transferred from the OS maintenance PC;
The difference between the new OS image file transferred from the OS maintenance PC and the previous generation OS image file stored in the image file storage means is extracted, and the difference is copied to the network storage. Update means to write to the old generation area,
New generation area update instruction means for instructing the management server to change the allocation to the diskless PC registered in the management server to a new generation area;
The multipoint computer management system according to claim 1, comprising: A multi-point computer management system that collectively manages security measures and applications used in personal computers (PCs) at each multi-point base.
The operation management center and each base system installed at multiple points are connected by WAN,
The base system is
A first WAN acceleration device for compressing and communicating communication information with the operation management center;
Each generation has a separate area, the area is replicated according to an instruction from the operation management center, and the maintained new generation OS acquired through the first WAN acceleration device is copied to the replicated area. Network storage to reflect,
A diskless PC that boots the OS from an individual area allocated by accessing the network storage without using an internal hard disk;
Have
The operation management center is
A second WAN acceleration device for compressing and communicating communication information with the base system;
A management server that allocates an individual area on the network storage to each diskless PC;
Without directly using the internal hard disk, means for directly accessing the network storage and instructing the replication of the old generation area of the network storage, and transferring the maintained new generation OS to the second WAN acceleration device An OS maintenance PC that instructs the management server to change the allocation to the diskless PC to a new generation area;
A multi-point computer management system characterized by comprising: A multi-point computer management system that collectively manages security measures and applications used in personal computers (PCs) at each multi-point base.
The operation management center and each base system installed at multiple points are connected to the WAN,
The operation management center is
A management server that allocates an individual area on the network storage to each diskless PC;
General-purpose software having screen transfer software for communicating only operation signals including keyboard and mouse operations and screen display signals, and means for instructing the management server to rewrite area information of the base system to new generation information PC,
Have
The base system is
A network storage that has an individual area for each generation and replicates the area according to an instruction from the operation management center;
A diskless PC that accesses the network storage notified from the management server without using an internal hard disk and starts an OS from an allocated individual area;
Based on the operation signal and the screen display signal received from the general-purpose PC, a keyboard OS maintenance PC that updates the copied old generation area;
A multi-point computer management system characterized by comprising: A multipoint computer management method for collectively managing security measures and applications used for personal computers (PCs) at multipoint sites,
A system in which an operation management center having an OS maintenance PC, an OS image management apparatus and a management server, a diskless PC and a network storage, and each base system provided at multiple points are connected by a WAN (Wide Area Network). In
In the OS maintenance PC of the operation center, the contents of the hard disk are converted into an OS image file in a format that can be booted by the diskless PC, transferred to the OS image management apparatus,
In the OS image management device, when an OS change is instructed from the OS maintenance PC, the difference between the new image file instructed to the old generation is extracted,
Instructing the network storage of the base system to replicate the area,
The network storage of the base system replicates the previous generation area,
The OS image management device writes the extracted difference to the copied old generation area of the network storage,
The OS image management apparatus instructs the management server to change information on an area on the network storage to be allocated to a diskless PC of the base system to new generation information. Computer management method. A multipoint computer management method for collectively managing security measures and applications used for personal computers (PCs) at multipoint sites,
An operation management center having an OS maintenance PC, a first WAN acceleration device and a management server, and a second WAN acceleration device, a network storage and a diskless PC, and each base system provided at multiple points. In a system connected by WAN,
In the OS maintenance PC of the operation management center, directly access the network storage of the base system without using an internal hard disk, and instruct the replication of the previous generation area of the network storage,
The network storage replicates the old generation area,
In the OS maintenance PC, a new generation OS is transferred to the first WAN acceleration device, and the first WAN acceleration device compresses the new generation OS to compress the second generation OS. To the WAN Accelerator
The network storage writes the new generation OS acquired through the second WAN acceleration device to the copied old generation area,
The OS maintenance PC instructs the management server to change information of the area on the network storage to be assigned to the diskless PC of the base system to new generation information. Computer management method. A multi-point computer management system that collectively manages security measures and applications used in personal computers (PCs) at each multi-point base.
In a system in which an operation management center having a general-purpose PC and a management server, an OS maintenance PC, a network storage and a diskless PC, and each base system provided at multiple points is connected to the WAN,
In the general-purpose PC of the operation management center, instruct the network storage of the base system to replicate the old generation area,
The network storage replicates the old generation area,
In the general-purpose PC, the built-in screen transfer software sends operation signals including keyboard and mouse operations and screen display signals to the OS maintenance PC of the base system,
The OS maintenance PC transfers the operation signal and the screen display signal to the network storage,
In the network storage, update the old generation area copied based on the operation signal and the screen display signal,
The general-purpose PC instructs the management server to change the information on the area on the network storage to be assigned to the diskless PC of the base system to new generation information. Method.

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