JP5618137B2 - Virtual client server and virtual client server control method - Google Patents

Virtual client server and virtual client server control method Download PDF

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JP5618137B2
JP5618137B2 JP2010200805A JP2010200805A JP5618137B2 JP 5618137 B2 JP5618137 B2 JP 5618137B2 JP 2010200805 A JP2010200805 A JP 2010200805A JP 2010200805 A JP2010200805 A JP 2010200805A JP 5618137 B2 JP5618137 B2 JP 5618137B2
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update data
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virtual client
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JP2012058957A (en
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求 塚田
求 塚田
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日本電気株式会社
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    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00Accessing, addressing or allocating within memory systems or architectures

Description

  The present invention relates to a virtual client server and a virtual client server control method.

  In recent years, virtual client systems have become widespread against the background of increasing importance of information security and speeding up of networks. In the virtual client system, for example, a plurality of virtual clients are generated on the server, and the virtual client can be used by accessing the server via a network from a computer such as a thin client. A server having a plurality of virtual clients is called a virtual client server.

  In such a virtual client server, it is necessary to prepare an operating system and application software environment for each virtual client. At this time, if all the virtual client operating system and application software data are individually stored for each virtual client, the required disk capacity increases as the number of virtual clients increases. For this reason, there is a case where a technique for reducing the disk capacity by creating a master image of a virtual client and generating a plurality of virtual clients by links referring to the master may be used. A virtual client generated by linking to a master in this way is called a clone.

  As a general method for reducing the disk capacity, in a storage device shared by a plurality of computers, a common area for storing data commonly used by the plurality of computers and an individual used by each computer individually There is one in which an area is provided (for example, Patent Document 1). In this method, when data is written from each computer to the storage device, only data that does not match the data stored in the common area is stored in the individual area in units of blocks.

JP 2009-230661 A

  Certainly, by creating a plurality of virtual clients by cloning, the disk capacity can be reduced as compared with the case of having all the data individually for each virtual client.

  However, after a plurality of virtual clients that are clones are generated, each virtual client may individually have the same data, and the effect of reducing the disk capacity is reduced. For example, when a patch is applied to the operating system of each virtual client, each virtual client individually has data generated by applying the patch. That is, the same patch data is held redundantly in a plurality of virtual clients.

  In order to eliminate patch data for each virtual client, it is necessary to create a new master image again, recreate the virtual client, and stop the operation of the virtual client.

  Moreover, although the method disclosed in Patent Document 1 shows a method of reducing disk capacity by sharing data in units of blocks among a plurality of computers, it is generated in each virtual computer created as a clone. However, it does not disclose a method for reducing the data at a timing asynchronous with the data generation.

  Accordingly, an object of the present invention is to reduce disk capacity without stopping the operation of a virtual client in a virtual client server having a plurality of virtual clients that operate based on master data.

  A virtual client server according to an aspect of the present invention includes a master data storage unit that stores master data, a reference data storage unit that stores reference data that refers to master data, and an individual update that performs individual update processing on the master data A plurality of virtual clients having a processing unit and an update data storage unit that stores update data for the master data, a common update processing unit that performs a common update process on the master data for each virtual client, and a master data A common update data storage unit that stores common update data generated by performing a common update process, a common update data stored in the common update data storage unit, and an update data storage unit of each virtual client Comparison between update data comparison unit that compares stored update data and update data comparison unit A reference control unit that changes the update data that matches the common update data out of the update data stored in the update data storage unit of each virtual client to refer to the common update data; and The client includes a storage area release unit that releases the storage area of the update data storage unit that has been used by the update data that has been changed to refer to the common update data by the reference control unit.

  In the present invention, the “part” does not simply mean a physical means, but includes a case where the function of the “part” is realized by software. Also, even if the functions of one “unit” or device are realized by two or more physical means or devices, the functions of two or more “units” or devices are realized by one physical means or device. May be.

  According to the present invention, in a virtual client server having a plurality of virtual clients that operate based on master data, it becomes possible to reduce the disk capacity without stopping the operation of the virtual clients.

It is a figure which shows the whole structure of the virtual client system which is one Embodiment of this invention. It is a figure which shows the structural example of a virtual PC server. It is a figure which shows an example of difference information. It is a flowchart which shows an example of a difference comparison process and a difference link process.

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

== System configuration ==
First, the system configuration will be described. FIG. 1 is a diagram showing an overall configuration of a virtual client system according to an embodiment of the present invention.

  As shown in FIG. 1, in a virtual client system, a virtual PC server 10 (virtual client server) and a plurality of clients 20-1 to 20-N are communicably connected via a network 30 such as the Internet.

  The virtual PC server 10 is an information processing apparatus that provides any of the virtual PCs 50-1 to 50-M, which are virtual clients, to the clients 20-1 to 20-N. For example, the virtual PC 50-1 includes a guest operating system (guest OS) 52 corresponding to a general PC operating system and an application 54 operating on the virtual PC 50-1. The other virtual PCs 50-2 to 50-M have the same configuration. The virtual PCs 50-1 to 50 -M are virtual clients, and are not physically separated from each other in the virtual PC server 10, but logically controlled by the virtual PC server 10. It is configured.

  Each of the clients 20-1 to 20-N is an information processing apparatus such as a thin client. For example, the user can use the virtual PC 50-1 by accessing the virtual PC server 10 from the client 20-1 via the network 30.

  FIG. 2 is a diagram illustrating a configuration example of the virtual PC server 10. As illustrated in FIG. 2, the virtual PC server 10 includes a shared master 60, a virtual PC generation unit 62, a patch application unit 64, a difference master generation unit 66, a difference master 68, and a virtual PC management unit 70. Yes.

  The shared master 60 (master data storage unit) is a template of a virtual PC, and stores master data 80 that is referenced from a plurality of virtual PCs. The master data 80 includes data necessary for the guest OS 52 and the application 54, for example.

  The virtual PC generation unit 62 has a function of generating a virtual PC based on the master data 80. For example, the virtual PC generation unit 62 can generate a virtual PC that refers to the master data 80 without generating the same data as the master data 80. In FIG. 2, only three virtual PCs 50-1 to 50-3 among the virtual PCs 50-1 to 50-M are shown as virtual PCs having reference data that refers to the master data 80. For example, the virtual PC 50-1 has reference data 82-1 that is a link to the master data 80. Further, the virtual PC 50-1 stores update data for the master data generated by processing of the guest OS 52 and application 54 (individual update processing unit) in the virtual PC 50-1, processing for applying patches to the guest OS 52, and the like. Can do. In the virtual PC 50-1, an environment for the virtual PC 50-1 is constructed by the reference data 82-1 and the update data 84-1A and 84-1B which are differences from the master data 80. The same applies to the virtual PCs 50-2 and 50-3.

  The patch application unit 64 (common update processing unit) executes update processing for applying a patch to the master data 80 for each of the virtual PCs 50-1 to 50-3. Note that the patch for the master data 80 is, for example, a patch for the guest OS 52. When patch application processing is executed for each virtual PC by the patch application unit 64, update data generated by applying the patch is stored in the storage area (update data storage unit) of each virtual PC. For example, update data 84-1A generated by applying a patch is stored in a storage area for storing update data in the virtual PC 50-1. Similarly, update data 84-2A and 84-3A generated by applying a patch are stored in the storage areas of the virtual PCs 50-2 and 50-3. In the present embodiment, the update data 84-1B is not data generated by applying a patch, but data generated by individual update processing in the virtual PC 50-1. Similarly, the update data 84-3C is not data generated by applying a patch but data generated by individual update processing in the virtual PC 50-3.

  The difference master generation unit 66 generates a difference master 68 in a state where a patch is applied to the shared master 60. The difference master 68 (common update data storage unit) includes reference data 86 for the master data 80 and update data 88-A generated by applying a patch to the master data 80. Here, the patch applied by the difference master generation unit 66 is the same as the patch applied by the patch application unit 64. That is, the update data 88-A is the same data as the update data 84-1A, 84-2A, and 84-3A in the virtual PCs 50-1, 50-2, and 50-3.

  The virtual PC management unit 70 has a function of managing storage areas of the virtual PCs 50-1 to 50-3, and includes a difference information storage unit 90, a difference comparison unit 92, a difference link unit 94, and a disk space release unit 96. Consists of.

  The difference information storage unit 90 (physical position information storage unit) stores, as difference information, information indicating the position where the update data 88-A is physically stored for the update data 88-A of the difference master 68. FIG. 3 is a diagram illustrating an example of difference information stored in the difference information storage unit 90. For example, a sector number (physical position information) indicating a position where the file data is physically stored is stored for each logical file name of the file constituting the update data 88-A. The sector number may include, for example, a start sector number and an end sector number, or may include a start sector number and the number of sectors. Also, depending on the configuration of the storage area, information other than the sector number can be used as physical position information.

  The difference comparison unit 92 (update data comparison unit) compares the update data 88-A of the difference master 68 with the update data stored in the storage areas of the virtual PCs 50-1 to 50-3. For example, for each file included in the update data 88-A, the difference comparison unit 92 checks whether a file with the same file name exists in the update data stored in the storage area of the virtual PCs 50-1 to 50-3. If it exists, check whether the file contents match.

  The difference link unit 94 (reference control unit) is stored in the difference master 68 among the update data stored in the storage areas of the virtual PCs 50-1 to 50-3 as a result of the comparison in the difference comparison unit 92. Data that matches the update data 88-A is linked to the update data 88-A. Specifically, for example, based on the difference information shown in FIG. 3, for each file whose contents match, information indicating the location where the update data of the virtual PCs 50-1 to 50-3 is physically stored The sector number of the file included in the update data 88-A is set.

  The disk space release unit 96 (storage area release unit) is update data 88 stored in the difference master 68 by the difference link unit 94 among update data stored in the storage areas of the virtual PCs 50-1 to 50-3. Release the storage area for update data linked to A. Note that the release of the storage area means that other data can be stored, and the stored data need not be erased at the release timing.

== Difference comparison and link processing ==
Next, difference comparison and link processing will be described. FIG. 4 is a flowchart illustrating an example of the difference comparison process and the difference link process.

  First, the difference comparison unit 92 selects a virtual PC to be compared (S401). Then, the difference comparison unit 92 compares the update data 88-A of the difference master 68 with the update data of the selected virtual PC (S402). When the contents of the update data match (S403: YES), the difference link unit 94 links the update data of the virtual PC so as to refer to the update data 88-A of the difference master 68 (S404). Further, the disk space releasing unit 96 releases the disk space (storage area) used in the virtual PC update data for the virtual PC update data linked to the update data 88-A of the difference master 68 (S405). ). The update data comparison, link, and release processing are executed, for example, in units of files. The update data link and release processing can be performed without stopping the operation of the virtual PC because it only changes the reference destination of the update data.

  When the contents of the update data do not match (S403: NO), or when the processing for the matching update data ends, the difference comparison unit 92 checks whether there is a virtual PC for which comparison has not been completed (S406). In the case (S406: YES), the process returns to the process of selecting the virtual PC (S401). When the comparison is completed for all virtual PCs (S406: NO), the process ends.

  A specific example of the process of FIG. 4 will be described with reference to FIG. For example, the difference comparison unit 92 selects the virtual PC 50-1 as the comparison target virtual PC. Then, the difference comparison unit 92 compares the update data 88-A of the difference master 68 with the update data 84-1A and 84-1B of the virtual PC 50-1. Here, the update data 84-1A is update data generated by patch application by the patch application unit 64, and the update data 84-1B is update data generated by individual update processing in the virtual PC 50-1. . Therefore, by the comparison by the difference comparison unit 92, the update data 84-1A matches the update data 88-A of the difference master 68, and the update data 84-1B does not match the update data 88-A of the difference master 68. Determined. Therefore, the difference link unit 94 links the update data 84-1A of the virtual PC 50-1 so as to refer to the update data 88-A of the difference master 68. As a result of this link processing, the disk space used in the update data 84-1A of the virtual PC 50-1 becomes unnecessary, and the disk space release unit 96 releases the area. Note that nothing is performed on the update data 84-1B, and the update data 84-1B is held in the storage area of the virtual PC 50-1.

  Similarly, processing is executed for the virtual PCs 50-2 and 50-3. That is, the update data 84-2A of the virtual PC 50-2 and the update data 84-3A of the virtual PC 50-3 match the update data 88-A of the difference master 68, and are linked to the update data 88-A of the difference master 68. Disk space is released.

  The embodiment of the present invention has been described above. According to the present embodiment, in the virtual PC server 10, update data that is redundantly held in the plurality of virtual PCs 50-1 to 50 -M is changed to a link to the update data 88 -A of the difference master 68. Can do. That is, in the virtual PC server 10 having a plurality of virtual PCs 50-1 to 50-M operating based on the master data 80, the disk capacity is reduced without stopping the operation of the virtual PCs 50-1 to 50-M. Can do.

  In the present embodiment, as shown in FIG. 2, a logical file name and a sector number (physical position information) are stored in association with each file constituting the update data 88-A of the difference master 68. Therefore, it is possible to link the update data having the same contents for each file.

  Further, in a configuration in which operating system patches are applied to a plurality of virtual PCs, there is a high possibility that the same update data is held in the plurality of virtual PCs. Therefore, as shown in the present embodiment, the update data held redundantly by the plurality of virtual PCs 50-1 to 50-M is changed to the link to the update data 88-A of the difference master 68, and each virtual data By releasing the disk space used for the update data of the PC, the disk capacity can be greatly reduced.

  Note that this embodiment is intended to facilitate understanding of the present invention and is not intended to limit the present invention. The present invention can be changed / improved without departing from the spirit thereof, and the present invention includes equivalents thereof.

  For example, in the present embodiment, an example in which only one shared master (template) exists is shown, but a plurality of shared masters may exist.

  Further, for example, the virtual PC server 10 may be configured by a single information processing device, or may be configured by a combination of a plurality of information processing devices and storage devices.

  A part or all of the present embodiment can be described as in the following supplementary notes, but is not limited thereto.

  (Supplementary Note 1) A master data storage unit that stores master data, a reference data storage unit that stores reference data that refers to the master data, an individual update processing unit that performs an individual update process on the master data, and the master An update data storage unit that stores update data for data, a plurality of virtual clients, a common update processing unit that performs a common update process on the master data for each virtual client, and the master data A common update data storage unit for storing common update data generated by performing a common update process; the common update data stored in the common update data storage unit; and the update data storage unit of each virtual client An update data comparison unit for comparing the update data stored in the update data comparison unit Based on the comparison result, the update data matching the common update data among the update data stored in the update data storage unit of each virtual client is changed to refer to the common update data And a storage area release unit that releases the storage area of the update data storage unit used in the update data that has been changed so as to refer to the common update data by the reference control unit in each virtual client And a virtual client server.

  (Additional remark 2) It is a virtual client server of Additional remark 1, Comprising: For each file which comprises the said common update data, a file name and the physical location information which shows the position where the data of the said file are physically memorize | stored Are further stored in association with each other, and the update data comparison unit stores the common update data stored in the common update data storage unit and the update data storage unit of each virtual client. The update control data is compared on a file basis, and the reference control unit determines whether the physical file of the files included in the update data of each virtual client matches the file included in the common update data. Change to refer to the physical position information corresponding to the file name of the file stored in the position information storage unit. Virtual client server.

  (Additional remark 3) It is a virtual client server of Additional remark 1 or 2, Comprising: The said master data contains the data of the operating system in each virtual client, In the said common update process, a patch is applied with respect to the said operating system. Virtual client server that contains the process to apply.

  (Additional remark 4) The reference data memory | storage part which memorize | stores the reference data which refer to master data, the separate update process part which performs the separate update process with respect to the said master data, The update data memory part which memorize | stores the update data with respect to the said master data Generating a plurality of virtual clients, performing a common update process on the master data for each virtual client, and generating common update data generated by performing the common update process on the master data. Storing, comparing the common update data and the update data stored in the update data storage unit of each virtual client, and storing them in the update data storage unit of each virtual client based on the comparison result Of the update data, the update data that matches the common update data A virtual client server that changes to refer to data and releases a storage area of the update data storage unit used in the update data changed to reference the common update data in each virtual client Control method.

  (Additional remark 5) The reference data storage part which memorize | stores the reference data which refer master data to a virtual client server, the separate update process part which performs the separate update process with respect to the said master data, and the update data with respect to the said master data are memorize | stored A function of generating a plurality of virtual clients having an update data storage unit; a function of performing a common update process on the master data for each virtual client; and performing the common update process on the master data A function for storing the common update data generated by the control, a function for comparing the common update data with the update data stored in the update data storage unit of each virtual client, and based on the comparison result Of the update data stored in the update data storage unit of each virtual client, For update data that matches the common update data, a function for changing the reference data to refer to the common update data, and in each virtual client, the update data that was changed to reference the common update data was used. And a program for releasing a storage area of the update data storage unit.

10 Virtual PC Server 20-1 to 20-N Client 30 Network 50-1 to 50-M Virtual PC
52 Guest OS
54 Application 60 Shared Master 62 Virtual PC Generation Unit 64 Patch Application Unit 66 Difference Master Generation Unit 68 Difference Master 70 Virtual PC Management Unit 80 Master Data 82-1 to 82-3 Reference Data 84-1A, 84-1B, 84-2A , 84-3A, 84-3C Update data 86 Reference data 88-A Update data 90 Difference information storage unit 92 Difference comparison unit 94 Difference link unit 96 Disk space release unit

Claims (5)

  1. A master data storage unit for storing master data;
    A reference data storage unit that stores reference data that refers to the master data, an individual update processing unit that performs an individual update process on the master data, and an update data storage unit that stores update data on the master data. Multiple virtual clients,
    A common update processing unit that performs a common update process on the master data for each virtual client;
    A common update data storage unit for storing common update data generated by performing the common update process on the master data;
    An update data comparison unit that compares the common update data stored in the common update data storage unit with the update data stored in the update data storage unit of each virtual client;
    Based on the comparison result of the update data comparison unit, the update data matching the common update data is referred to for the update data stored in the update data storage unit of each virtual client. A reference control unit to be changed to
    In each virtual client, a storage area release unit that releases the storage area of the update data storage unit that was used in the update data that has been changed to refer to the common update data by the reference control unit;
    A virtual client server comprising:
  2. The virtual client server according to claim 1,
    For each file that constitutes the common update data, further comprising a physical position information storage unit that stores a file name and physical position information indicating a position where data of the file is physically stored in association with each other,
    The update data comparison unit compares the common update data stored in the common update data storage unit with the update data stored in the update data storage unit of each virtual client in units of files,
    The reference control unit is a file of the file stored in the physical location information storage unit for a file that matches the file included in the common update data among the files included in the update data of each virtual client. A virtual client server that changes to refer to the physical location information corresponding to the name.
  3. The virtual client server according to claim 1 or 2,
    The master data includes operating system data in each virtual client,
    The virtual client server includes a process for applying a patch to the operating system in the common update process.
  4. A plurality of reference data storage units that store reference data that refers to master data, an individual update processing unit that performs individual update processing on the master data, and an update data storage unit that stores update data on the master data Generate a virtual client for
    Perform a common update process on the master data for each virtual client,
    Storing common update data generated by performing the common update process on the master data;
    Comparing the common update data with the update data stored in the update data storage unit of each virtual client;
    Based on the comparison result, among the update data stored in the update data storage unit of each virtual client, the update data that matches the common update data is changed to refer to the common update data,
    In each virtual client, release the storage area of the update data storage unit used in the update data changed to refer to the common update data.
    Virtual client server control method.
  5. On the virtual client server,
    A plurality of reference data storage units that store reference data that refers to master data, an individual update processing unit that performs individual update processing on the master data, and an update data storage unit that stores update data on the master data The ability to generate virtual clients for
    A function of performing a common update process on the master data for each virtual client;
    A function of storing common update data generated by performing the common update process on the master data;
    A function of comparing the common update data with the update data stored in the update data storage unit of each virtual client;
    A function of changing the update data that matches the common update data among the update data stored in the update data storage unit of each virtual client so as to refer to the common update data based on the comparison result When,
    In each virtual client, a function of releasing the storage area of the update data storage unit used in the update data changed to refer to the common update data;
    A program to realize
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