JP2008293103A - Distributed arrangement device and method for arranging virtual device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a computer system for achieving a virtual system which has high reliability. <P>SOLUTION: This distributed arrangement device connected through a network to a plurality of physical devices where virtual devices configuring a virtual system are arranged, prepares system arrangement information showing association of the virtual devices with the physical devices in which the virtual devices are arranged, and calculates the reliability characteristic value of the virtual system when the virtual devices are arranged in the physical devices according to the prepared system arrangement information by referring to at least one of the prepared system arrangement information, the association of the virtual system with the virtual devices configuring the virtual system, redundancy relation among the virtual devices and the reliability characteristic values of the physical devices. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a distributed placement device connected to a physical device via a network, and more particularly to a technique for placing a virtual device on a physical device.

  Patent Document 1 discloses a computer system that implements a virtual server device in order to increase availability. The computer system includes a plurality of physical server devices. A plurality of virtual server apparatuses operate on the plurality of physical server apparatuses. The virtual server device has one or more virtual IP addresses.

  In the technology of Patent Document 1, when a failure occurs in a port provided in a physical server device, the virtual IP address assigned to the failed port is normal until there is no normal port provided in the physical server device. Will be reassigned to the correct port. Thereafter, the virtual server device is failed over.

In the technique disclosed in Patent Literature 1, priority can be given to the virtual server device. Then, failover is performed in order from the virtual server device with the highest priority.
JP-T-2004-537126

  In the technique of Patent Document 1, it is determined on which physical server device the virtual server device is operated without considering the reliability of the virtual system. Therefore, there has been a problem that the reliability of the virtual system is lowered.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a computer system that realizes a highly reliable virtual system.

  A representative embodiment of the present invention is a distributed placement device connected via a network to a plurality of physical devices in which virtual devices constituting a virtual system are placed, and the virtual devices and the virtual devices are placed System arrangement information indicating correspondence with the physical device is created, the created system arrangement information, correspondence between the virtual system and the virtual device constituting the virtual system, redundancy relationship between the virtual devices, and the physical Calculating at least one of the reliability characteristic values of the device and calculating the reliability characteristic value of the virtual system when the virtual device is arranged in the physical device according to the created system arrangement information; Features.

  According to the representative embodiment of the present invention, the reliability of the virtual system can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram of a configuration of a computer system according to the embodiment of this invention.

  The computer system includes a distributed arrangement device 10, a network 20, a physical network device 30, a physical server device 40, and a physical disk device 50.

  In FIG. 1, two physical network devices 30 are shown, but any number of physical network devices 30 may be provided in the computer system. Similarly, although three physical server devices 40 are illustrated, any number of computer systems may be provided in the computer system. Similarly, although two physical disk devices 50 are illustrated, any number of computer systems may be provided in the computer system.

  The distributed arrangement device 10 includes a processor 101, a disk device 102, a network device 103, an input device 104, a display device 105, and a memory 106.

  The processor 101 performs various processes by executing a program stored in the memory 106. The processor 101 is a CPU, for example.

  The disk device 102 is, for example, a hard disk. The disk device 102 stores various types of information including programs.

  Specifically, the disk device 102 includes a virtual system device data table 60, a virtual system connection data table 61, a virtual system importance table 62, a physical system device data table 63, a physical system connection data table 64, and a disk device system layout. A data table 65, a server apparatus system arrangement data table 66, a network apparatus system arrangement data table 67, an available truth value table 68, and a system availability table 69 are stored.

  Virtual system device data table 60, virtual system connection data table 61, virtual system importance table 62, physical system device data table 63, physical system connection data table 64, disk device system arrangement data table 65, server device system At least one of the placement data table 66, the network device system placement data table 67, the available truth value table 68, and the system availability table 69 may be stored in the memory 106 instead of the disk device 102.

  The virtual system device data table 60 shows information related to virtual devices constituting the virtual system. Details of the virtual system device data table 60 will be described with reference to FIG.

  The virtual system is a virtual computer system realized by the computer system. The virtual device includes a virtual network device, a virtual server device, a virtual disk device, and the like. The virtual network device is a virtual network device that operates on any physical network device 30 (arranged on any physical network device 30). The virtual server device is a virtual server device that operates (arranged on any physical server device 40) on any physical server device 40. The physical disk device is a virtual disk device that operates (arranged on any physical disk device 50) on any physical disk device 50.

  The virtual system connection data table 61 shows a logical connection relationship between virtual devices. Details of the virtual system connection data table 61 will be described with reference to FIG.

  The virtual system importance table 62 indicates the importance of each virtual system as a relative value. Details of the virtual system importance table 62 will be described with reference to FIG.

  The physical system device data table 63 shows information related to physical devices that constitute the computer system. Details of the physical system device data table 63 will be described with reference to FIG.

  The physical devices include a physical network device 30, a physical server device 40, and a physical disk device 50.

  The physical system connection data table 64 indicates a physical connection relationship between physical devices. Details of the physical system connection data table 64 will be described with reference to FIG.

  The disk device system arrangement data table 65 indicates in which physical disk device 50 the virtual disk device is arranged. Details of the disk device system arrangement data table 65 will be described with reference to FIG.

  The server apparatus system arrangement data table 66 indicates in which physical server apparatus 40 the virtual server apparatus is arranged. Details of the server device system arrangement data table 66 will be described with reference to FIG.

  The network device system arrangement data table 67 indicates in which physical network device 30 the virtual network device is arranged. Details of the network device system arrangement data table 67 will be described with reference to FIG.

  The available truth value table 68 includes information for calculating the operating rate of the virtual system. The usable truth value table 68 will be described in detail with reference to FIG.

  In the present embodiment, the operating rate of the virtual system is a ratio of the time during which the virtual system is operating normally to all the times during which the virtual system should operate. Therefore, the operating rate of the virtual system is calculated by MTBF / (MTBF + MTTR). MTBF is the average failure interval of the virtual system, and MTTR is the average repair time of the virtual system.

  The system availability table 69 shows the operating rate of the virtual system. Details of the system availability table 69 will be described with reference to FIG.

  The network device 103 is an interface for connecting to the network 20. The network device 103 is a LAN card, for example.

  The input device 104 receives input of information from the operator of the distributed arrangement device 10. The input device 104 is, for example, a mouse or a keyboard.

  The display device 105 outputs various information. The display device 105 is, for example, a CRT display or a liquid crystal display.

  The memory 106 stores a program executed by the processor 101, information required by the processor 101, and the like.

  Specifically, the memory 106 includes a virtual system configuration acquisition unit 111, a physical system configuration acquisition unit 112, a system arrangement data management unit 113, a system arrangement execution instruction unit 114, a system arrangement data creation unit 121, and a connection constraint condition determination unit 122. The compatibility condition determination unit 123, the system reliability characteristic value calculation unit 124, and the system layout evaluation value calculation unit 125 are stored.

  The virtual system configuration acquisition unit 111, the physical system configuration acquisition unit 112, the system arrangement data management unit 113, the system arrangement execution instruction unit 114, the system arrangement data creation unit 121, the connection constraint condition determination unit 122, and the compatibility condition determination unit 123. The system reliability characteristic value calculation unit 124 and the system layout evaluation value calculation unit 125 are programs executed by the processor 101, but may be hardware integrated into an integrated circuit.

  The virtual system configuration acquisition unit 111 creates a virtual system device data table 60, a virtual system connection data table 61, and a virtual system importance level table 62. The physical system configuration acquisition unit 112 creates a physical system device data table 63 and a physical system connection data table 64. The system arrangement data management unit 113 controls the entire processing of the distributed arrangement apparatus 10.

  The system arrangement execution instruction unit 114 instructs the physical network device 30 to operate the virtual network device. As a result, the system placement execution instruction unit 114 places the virtual network device in the physical network device 30.

  In addition, the system arrangement execution instruction unit 114 instructs the physical server device 40 to operate the virtual server device. As a result, the system placement execution instruction unit 114 places the virtual server device in the physical server device 40.

  Further, the system arrangement execution instruction unit 114 instructs the physical disk device 50 to operate the virtual disk device. As a result, the system arrangement execution instruction unit 114 arranges the active disk device in the physical disk device 50.

  The system arrangement data creation unit 121 creates a disk apparatus system arrangement data table 65, a server apparatus system arrangement data table 66, and a network apparatus system arrangement data table 67.

  The connection constraint condition determination unit 122 is configured so that the virtual system when a virtual device is arranged according to the disk device system arrangement data table 65, the server device system arrangement data table 66, and the network device system arrangement data table 67 is between virtual devices. It is determined whether or not a condition relating to the logical connection relationship is satisfied.

  The compatibility condition determination unit 123 is configured so that the virtual system when the virtual device is arranged according to the disk device system arrangement data table 65, the server device system arrangement data table 66, and the network device system arrangement data table 67 It is determined whether or not the above is satisfied. The compatibility condition is a condition related to performance or a condition related to the number of virtual devices that can be arranged in one physical device. The performance condition is a processor usage rate, a memory usage rate, or a physical disk usage rate.

  The system reliability characteristic value calculation unit 124 operates the virtual system when the virtual device is arranged according to the disk device system arrangement data table 65, the server device system arrangement data table 66, and the network device system arrangement data table 67. Is calculated.

  The system placement evaluation value calculation unit 125 calculates a system placement evaluation value when a virtual device is placed according to the disk device system placement data table 65, the server device system placement data table 66, and the network device system placement data table 67. To do. The system placement evaluation value is a value for evaluating the placement of the virtual device on the physical device.

  The network 20 connects the distributed arrangement device 10, the physical network device 30, the physical server device 40, and the physical disk device 50 to each other. The network 20 is, for example, a LAN or a WAN.

  The physical network device 30 is a communication device for connecting the physical server device 40 to the network 20. The physical network device 30 is, for example, an L2 switch or an L3 switch. Details of the physical network device 30 will be described with reference to FIG.

  The physical server device 40 processes various information. Details of the physical server device 40 will be described with reference to FIG.

  The physical disk device 50 stores various information. Details of the physical disk device 50 will be described with reference to FIG.

  The physical network device 30, the physical server device 40, and the physical disk device 50 are management targets of the distributed arrangement device 10.

  FIG. 2 is a block diagram of a configuration of the physical network device 30 provided in the computer system according to the embodiment of this invention.

  The physical network device 30 includes a processor 301, a memory 302, and an interface 303.

  The processor 301 performs various processes by executing a program stored in the memory 302. The processor 301 is a CPU, for example.

  The memory 302 stores a program executed by the processor 301, information required by the processor 301, and the like. Specifically, the memory 302 stores the virtualization mechanism unit 311.

  The virtualization mechanism unit 311 operates one or more virtual network devices 321 on the physical network device 30. The virtual network device 321 is a virtual network device having a function equivalent to that of a physical network device. Note that the virtual network device 321 may be realized by hardware or software. That is, the virtual network device 321 may be any virtual network device that operates on the physical network device 30.

  The interface 303 is connected to the network 20 and the physical server device 40.

  FIG. 3 is a block diagram of a configuration of the physical server device 40 provided in the computer system according to the embodiment of this invention.

  The physical server device 40 includes a processor 401, a memory 402, and an interface 403.

  The processor 401 performs various processes by executing a program stored in the memory 402. The processor 401 is, for example, a CPU.

  The memory 402 stores a program executed by the processor 401, information required by the processor 401, and the like. Specifically, the memory 402 stores the virtualization mechanism unit 411.

  The virtualization mechanism unit 411 operates one or more virtual server devices 421 on the physical server device 40. The virtual server device 421 is a virtual server device having a function equivalent to that of a physical server device. The virtual server device 421 may be realized by hardware or may be realized by software. That is, the virtual server device 421 may be any virtual server device that operates on the physical server device 40.

  The interface 403 is connected to the physical network device 30 and the physical disk device 50.

  FIG. 4 is a block diagram of a configuration of the physical disk device 50 provided in the computer system according to the embodiment of this invention.

  The physical disk device 50 includes a processor 501, a memory 502, an interface 503, and a physical disk 504.

  The processor 501 performs various processes by executing a program stored in the memory 502. The processor 501 is a CPU, for example.

  The memory 502 stores a program executed by the processor 501, information required by the processor 501, and the like. Specifically, the memory 502 stores a virtualization mechanism unit 511.

  The virtualization mechanism unit 511 operates one or more virtual disk devices 521 on the physical disk device 50. The virtual disk device 521 is a virtual disk device having a function equivalent to that of a physical disk device. Note that the virtual disk device 521 may be realized by hardware or software. In other words, the virtual disk device 521 may be any virtual disk device that operates on the physical disk device 50.

  The interface 503 is connected to the physical server device 40.

  FIG. 5 is a configuration diagram of the virtual system device data table 60 stored in the distributed arrangement device 10 according to the embodiment of this invention.

  The virtual system device data table 60 includes a virtual system ID 601, a virtual device type 602, a virtual device ID 603, and a redundant ID 604.

  The virtual system ID 601 is a unique identifier of a virtual system realized by the computer system. Note that the computer system may realize a plurality of virtual systems.

  The virtual device ID 603 is a unique identifier of the virtual device that constitutes the virtual system identified by the virtual system ID 601 in the row.

  The virtual device type 602 indicates the type of the virtual device identified by the virtual device ID 603 in the row. Specifically, the virtual device type 602 indicates whether the virtual device identified by the virtual device ID 603 in the row is the virtual network device 321, the virtual server device 421, or the virtual disk device 521.

  The redundancy ID 604 is an identifier for specifying the redundancy relationship of the virtual devices identified by the virtual device ID 603 in the row.

  In FIG. 5, “sv1” is stored in the redundant ID 604 in the row in which “Sv1” is stored in the virtual device ID 603 and the row in which “Sv1 ′” is stored in the virtual device ID 603. In this case, the virtual server device 421 identified by “Sv1” and the virtual server device 421 identified by “Sv1 ′” have a redundant relationship.

  FIG. 6 is a configuration diagram of the virtual system connection data table 61 stored in the distributed arrangement device 10 according to the embodiment of this invention.

  The virtual system connection data table 61 includes a connection source virtual device ID 611 and a connection destination virtual device ID 612.

  The connection source virtual device ID 611 is a unique identifier of the virtual network device 321 or the virtual disk device 521 constituting the virtual system. The connection destination virtual device ID 612 is a unique identifier of the virtual server device 421 logically connected to the virtual network device 321 or the virtual disk device 521 identified by the connection source virtual device ID 611.

  FIG. 7 is a configuration diagram of the virtual system importance table 62 stored in the distributed arrangement apparatus 10 according to the embodiment of this invention.

  The virtual system importance table 62 shows a virtual system ID 621 and a system importance 622.

  The virtual system ID 621 is a unique identifier of a virtual system realized by the computer system.

  The system importance 622 is a numerical value relatively indicating the importance of the virtual system identified by the virtual system ID 601 in the row. For example, sales obtained when the virtual system operates normally for one year is used as the system importance 622.

  The distributed arrangement device 10 does not need to store the virtual system connection data table 61. In this case, the distributed arrangement device 10 calculates the system arrangement evaluation value by summing all the operating rates of the virtual system realized by the computer system.

  FIG. 8 is a configuration diagram of the physical system device data table 63 stored in the distributed arrangement device 10 according to the embodiment of this invention.

  The physical system device data table 63 includes a physical device type 632, a physical device ID 633, and a device operation rate 634.

  The physical device ID 633 is a unique identifier of the physical device provided in the computer system.

  The physical device type 632 indicates the type of the physical device identified by the physical device ID 633 in the row. Specifically, the physical device type 632 indicates whether the physical device identified by the physical device ID 633 in the row is the physical network device 30, the physical server device 40, or the physical disk device 50.

  The device operation rate 634 is the operation rate of the physical device identified by the physical device ID 633 in the row. The operation rate of the physical device is a ratio of the time during which the physical device is operating normally to the total time during which the physical device is to operate. Therefore, the operating rate of the physical device is calculated by MTBF / (MTBF + MTTR). Note that MTBF is an average failure interval of physical devices, and MTTR is an average repair time of physical devices.

  FIG. 9 is a configuration diagram of the physical system connection data table 64 stored in the distributed arrangement device 10 according to the embodiment of this invention.

  The physical system connection data table 64 includes a connection source physical device ID 641 and a connection destination physical device ID 642. The connection source physical device ID 641 is a unique identifier of the physical network device 30 or the physical disk device 50 constituting the computer system. The connection destination physical device ID 642 is a unique identifier of the physical server device 40 physically connected to the physical network device 30 or the physical disk device 50 identified by the connection source physical device ID 641 of the row.

  FIG. 10 is a configuration diagram of the disk unit system arrangement data table 65 stored in the distributed arrangement apparatus 10 according to the embodiment of this invention.

  The disk device system arrangement data table 65 includes a virtual disk device ID 651 and a physical disk device ID 652.

  The virtual disk device ID 651 is a unique identifier of the virtual disk device 521. The physical disk device ID 652 is a unique identifier of the physical disk device 50.

  Each box 653 included in the disk device system arrangement data table 65 indicates that the virtual disk device 521 identified by the virtual disk device ID 651 in the column is the physical disk device 50 identified by the physical disk device ID 652 in the row. Indicates whether or not to be placed.

  When “1” is stored in the box 653, the virtual disk device 521 is arranged in the physical disk device 50. On the other hand, when “0” is stored in the box 653, the virtual disk device 521 is not placed in the physical disk device 50.

  FIG. 11 is a configuration diagram of the server apparatus system arrangement data table 66 stored in the distributed arrangement apparatus 10 according to the embodiment of this invention.

  The server device system arrangement data table 66 includes a virtual server device ID 661 and a physical server device ID 662.

  The virtual server device ID 661 is a unique identifier of the virtual server device 421. The physical server device ID 662 is a unique identifier of the physical server device 40.

  Each box 663 included in the server device system arrangement data table 66 indicates that the virtual server device 421 identified by the virtual server device ID 661 in the row corresponds to the physical server device 40 identified by the physical server device ID 662 in the row. Indicates whether or not to be placed.

  When “1” is stored in the box 663, the virtual server device 421 is arranged in the physical server device 40. On the other hand, when “0” is stored in the box 663, the virtual server device 421 is not arranged in the physical server device 40.

  FIG. 12 is a configuration diagram of the network device system arrangement data table 67 stored in the distributed arrangement apparatus 10 according to the embodiment of this invention.

  The network device system arrangement data table 67 includes a virtual network device ID 671 and a physical network device ID 672.

  The virtual network device ID 671 is a unique identifier of the virtual network device 321. The physical network device ID 672 is a unique identifier of the physical network device 30.

  Each box 673 included in the network device system arrangement data table 67 indicates that the virtual network device 321 identified by the virtual network device ID 671 in the column corresponds to the physical network device 30 identified by the physical network device ID 672 in the row. Indicates whether or not to be placed.

  When “1” is stored in the box 673, the virtual network device 321 is arranged in the physical network device 30. On the other hand, when “0” is stored in the box 673, the virtual network device 321 is not arranged in the physical network device 30.

  FIG. 13 is a configuration diagram of the available truth value table 68 stored in the distributed arrangement device 10 according to the embodiment of this invention.

  The available truth value table 68 includes a physical device list 681, a truth value 682, and an event occurrence probability 683.

  The physical device list 681 indicates whether each of the physical devices included in the computer system can operate normally. The physical device list 681 in this explanatory diagram includes the physical disk device 50 identified by “Dp1”, the physical server device 40 identified by “Sp1”, the physical server device 40 identified by “Sp2”, and “Np1”. It indicates whether each of the identified physical network devices 30 is in a normal operating state.

  When “0” is stored in the physical device list 681, the physical device is in a normally operating state. On the other hand, when “1” is stored in the physical device list 681, the physical device does not operate normally.

  For example, (0, 0, 0, 1) is stored in the physical device list 681 on the second line of the available truth table 68 shown in FIG. In this case, only the physical network device 30 identified by “Np1” operates normally. On the other hand, the physical disk device 50 identified by “Dp1”, the physical server device 40 identified by “Sp1”, and the physical server device 40 identified by “Sp2” are not operating normally.

  The truth value 682 indicates whether or not the entire virtual system can operate normally when the physical device corresponds to the physical device list 681 in the row.

  When “0” is stored in the truth value 682, the entire virtual system is in a normally operating state. On the other hand, when “1” is stored in the truth value 682, the entire virtual system does not operate normally.

  The event occurrence probability 683 is a probability that the physical device is in a state corresponding to the physical device list 681 of the row.

  FIG. 14 is a configuration diagram of the system availability table 69 stored in the distributed arrangement apparatus 10 according to the embodiment of this invention.

  The system availability table 69 includes a virtual system ID 691 and a virtual system operation rate 692.

  The virtual system ID 691 is a unique identifier of a virtual system realized by the computer system.

  The virtual system operating rate 692 is the operating rate of the virtual system identified by the virtual system ID 691 in the row.

  FIG. 15 is a flowchart of system arrangement processing executed by the distributed arrangement apparatus 10 according to the embodiment of this invention.

  First, the distributed arrangement device 10 receives input of virtual system configuration data from an operator (S601). The virtual system configuration data includes information regarding the virtual system device data table 60, the virtual system connection data table 61, and the virtual system importance table 62.

  Next, the distributed arrangement device 10 creates a virtual system device data table 60, a virtual system connection data table 61, and a virtual system importance level table 62 based on the input virtual system configuration data.

  Next, the distributed arrangement device 10 acquires physical system configuration data from the physical network device 30, the physical server device 40, and the physical disk device 50. The physical system configuration data includes information regarding the physical system device data table 63 and the physical system connection data table 64. The distributed arrangement device 10 may receive a part or all of the physical system configuration data from an operator instead of acquiring it from the physical network device 30, the physical server device 40, and the physical disk device 50.

  Next, the distributed arrangement device 10 creates a physical system device data table 63 and a physical system connection data table 64 based on the acquired physical system configuration data.

  Next, the distributed arrangement device 10 creates system arrangement data that has not been created in the previous step S603 (S603). Next, the distributed placement device 10 creates a disk device system placement data table 65, a server device system placement data table 66, and a network device system placement data table 67 based on the created system placement data.

  At this time, the distributed arrangement device 10 uses the disk device system arrangement data table so that the sum of the values stored in the respective columns included in the disk device system arrangement data table 65 is “1”. 65 is created. Then, the created disk device system arrangement data table 65 indicates that one virtual disk device 521 is necessarily arranged on any one physical disk device 50.

  Similarly, the distributed arrangement device 10 uses the server apparatus system arrangement data table so that the sum of the values stored in the respective columns included in the server apparatus system arrangement data table 66 is “1”. 66 is created. Then, the created server apparatus system arrangement data table 66 indicates that one virtual server apparatus 421 is necessarily arranged in any one physical server apparatus 40.

  Furthermore, the distributed arrangement device 10 uses the network apparatus system arrangement data table 67 so that the sum of the values stored in the respective columns included in the network apparatus system arrangement data table 67 is “1”. Create Then, the created network device system arrangement data table 67 indicates that one virtual network device 321 is necessarily arranged in any one physical network device 30.

  Next, the distributed arrangement device 10 is configured so that the virtual system when the virtual device is arranged in accordance with the disk device system arrangement data table 65, the server device system arrangement data table 66, and the network device system arrangement data table 67 has connection restrictions. It is determined whether or not the condition is satisfied (S604). The connection constraint condition is a condition relating to a logical connection relationship between virtual devices, and is stored in the virtual system connection data table 61.

  Specifically, the distributed arrangement device 10 determines whether or not two physical devices in which two virtual devices having a logical connection relationship are arranged have a physical connection relationship.

  For example, the case where the virtual system connection data table 61 is shown in FIG. 6 will be described. In the first row of the virtual system connection data table 61, “Dv1” is stored in the connection source virtual device ID 611, and “Sv1” is stored in the connection destination virtual device ID 612. Therefore, the virtual disk device 521 identified by “Dv1” and the virtual server device 421 identified by “Sv1” need to have a logical connection relationship.

  In this case, the distributed arrangement device 10 specifies the physical disk device 50 in which the virtual disk device 521 identified by “Dv1” is arranged based on the disk device system arrangement data table 65. Here, the distributed arrangement device 10 specifies the physical disk device 50 identified by “Dp1”.

  Next, the distributed arrangement device 10 specifies the physical server device 40 in which the virtual server device 421 identified by “Sv1” is arranged based on the server device system arrangement data table 66. Here, the distributed arrangement device 10 specifies the physical server device 40 identified by “Sp1”.

  Next, based on the physical system connection data table 64, the distributed arrangement device 10 is physically configured with the physical disk device 50 identified by the identified “Dp1” and the physical server device 40 identified by the identified “Sp1”. It is determined whether or not there is a proper connection relationship.

  The distributed arrangement device 10 performs the same processing for all pairs of the connection source virtual device ID 611 and the connection destination virtual device ID 612 in the virtual system connection data table 61. The distributed arrangement apparatus 10 determines that the connection constraint condition is satisfied only when it is determined that all the executed processes have a physical connection relationship. On the other hand, when it is determined that any one of the executed processes does not have a physical connection relationship, the distributed arrangement device 10 determines that the connection constraint condition is not satisfied.

  If it is determined that the connection constraint condition is not satisfied, the distributed placement apparatus 10 proceeds directly to step S608.

  On the other hand, when it is determined that the connection constraint condition is satisfied, the virtual device is placed in the distributed placement device 10 according to the disk device system placement data table 65, the server device system placement data table 66, and the network device system placement data table 67. In this case, it is determined whether or not the virtual system satisfies the compatibility condition (S605).

  For example, the distributed placement device 10 determines whether or not the limit on the number of virtual devices that can be placed in the physical device is exceeded. In addition, the distributed arrangement device 10 determines whether or not the virtual device arranged in the physical device satisfies a performance condition.

  If it is determined that the compatibility condition is not satisfied, the distributed placement apparatus 10 proceeds to step S608 as it is.

  On the other hand, when it is determined that the compatibility condition is satisfied, the distributed arrangement device 10 performs a system arrangement evaluation value calculation process (S606). Thereby, the distributed arrangement device 10 calculates the system arrangement evaluation value when the virtual device is arranged according to the disk device system arrangement data table 65, the server device system arrangement data table 66, and the network device system arrangement data table 67. To do. Details of the system layout evaluation value calculation processing will be described with reference to FIG.

  Next, the distributed arrangement device 10 compares the system arrangement evaluation value stored in the previous step S607 with the system arrangement evaluation value calculated in step S606 (S607). If the system layout evaluation value stored in the previous step S607 is greater than or equal to the system layout evaluation value calculated in step S606, the distributed placement device 10 proceeds directly to step S608.

  On the other hand, when the system arrangement evaluation value calculated in step S606 is larger than the system arrangement evaluation value stored in the previous step S607, the distributed arrangement apparatus 10 replaces the system arrangement evaluation value stored in the previous step S607 with step S606. The system layout evaluation value calculated in step 1 is stored. Furthermore, the distributed arrangement device 10 stores the system arrangement data created in step S603 and the system availability table 69 created in step S606.

  When step 607 is executed for the first time, the distributed placement apparatus 10 stores the system placement evaluation value calculated in step S606, the system placement data created in step S603, and the system availability table 69 created in step S606.

  Next, the distributed arrangement device 10 determines whether all system arrangement data that can be created has been created in step S603 (S608). If all the system arrangement data that can be created has not been created, the distributed arrangement apparatus 10 returns to step S603 and repeats the processing.

  On the other hand, when all the system arrangement data that can be created are created, the distributed arrangement apparatus 10 outputs at least one of the stored system arrangement evaluation value, system arrangement data, and system availability table 69 (S609). . For example, the distributed arrangement device 10 displays the virtual system arrangement candidate screen 80. Note that the distributed arrangement device 10 outputs the stored system arrangement evaluation value, system arrangement data, and system availability table 69 to a disk instead of outputting the stored system arrangement evaluation value, system arrangement data, and system availability table 69. It may be stored in the device 102 or the memory 106.

  FIG. 16 is an explanatory diagram of the virtual system arrangement candidate screen 80 displayed on the distributed arrangement apparatus 10 according to the embodiment of this invention.

  The virtual system arrangement candidate screen 80 includes a virtual system arrangement candidate diagram 81, a system availability table 69, a system arrangement evaluation value 83, an arrangement execution button 84, and an end button 85.

  The virtual system arrangement candidate diagram 81 is a diagram schematically showing the system arrangement data stored in the distributed arrangement apparatus 10 in step S607. The system availability table 69 and the system arrangement evaluation value 83 are stored in the distributed arrangement apparatus 10 in step S607.

  The placement execution button 84 is a button for receiving a placement execution instruction from the operator. The end button 85 is a button for accepting an end instruction from the operator.

  Returning now to FIG.

  When the end button 85 included in the virtual system arrangement candidate screen 80 is operated, the distributed arrangement apparatus 10 ends the system arrangement process as it is.

  On the other hand, when the placement execution button 84 included in the virtual system placement candidate screen 80 is operated, the distributed placement device 10 transmits a placement instruction for the virtual device to the physical network device 30, the physical server device 40, and the physical disk device 50. To do. The virtual device placement instruction instructs placement of the virtual device according to the system placement data stored in the distributed placement device 10 (S610).

  However, the distributed arrangement apparatus 10 may execute the arrangement of the virtual system by other means without transmitting the virtual apparatus arrangement instruction.

  Upon receiving the virtual device placement instruction, the physical network device 30 operates the virtual network device 321 on the physical network device 30 based on the received placement instruction. Similarly, when receiving a virtual device placement instruction, the physical server device 40 operates the virtual server device 421 on the physical server device 40 based on the received placement instruction. Similarly, when the physical disk device 50 receives a virtual device placement instruction, it operates the virtual disk device 521 on the physical disk device 50 based on the received placement instruction.

  Then, the distributed arrangement device 10 ends the system arrangement process.

  FIG. 17 is a flowchart of the system arrangement evaluation value calculation process executed by the distributed arrangement apparatus 10 according to the embodiment of this invention.

  The system layout evaluation value calculation process is executed in step S606 of the system layout process (FIG. 15).

  First, the distributed arrangement device 10 sequentially selects all the virtual systems realized by the computer system one by one (S700).

  Next, the distributed arrangement device 10 creates virtual system usable expression data (S701). The virtual system availability expression data is a logical expression that represents the state of each virtual device in a state where the entire virtual system can operate normally.

  Specifically, the distributed arrangement apparatus 10 selects all the rows in which the identifier of the selected virtual system matches the virtual system ID 601 of the virtual system apparatus data table 60 from the virtual system apparatus data table 60. Next, the distributed arrangement device 10 selects all the rows for which no value is stored in the redundancy ID 604 from the selected rows. Next, the distributed arrangement device 10 extracts the virtual device ID 603 from all the selected rows. Next, the distributed arrangement device 10 combines all the extracted virtual device IDs 603 with the logical product symbol “∩”.

  For example, a case where the identifier of the virtual system selected in step S700 is “1” will be described. In this case, the distributed arrangement device 10 extracts “Dv1” and “Nv1” as the virtual device ID 603. Therefore, the distributed arrangement device 10 creates Formula 1 by combining the extracted “Dv1” and “Nv1”.

  Next, the distributed arrangement device 10 selects all the rows in which the identifier of the selected virtual system matches the virtual system ID 601 of the virtual system device data table 60 from the virtual system device data table 60. Next, the distributed arrangement device 10 selects a row in which a value is stored in the redundancy ID 604 from the selected rows. Next, the distributed arrangement device 10 extracts the virtual device ID 603 from the selected row.

  Next, the distributed arrangement device 10 combines a plurality of virtual device IDs 603 extracted from the rows in which the same value is stored in the redundancy ID 604 with the logical sum symbol “∪” and surrounds them with parentheses. Next, the distributed placement device 10 combines the created Formula 1 and all the formulas enclosed in parentheses with the logical product symbol “∩”.

  For example, a case where the identifier of the virtual system selected in step S700 is “1” will be described. In this case, the distributed arrangement device 10 extracts “Sv1” and “Sv1 ′” as the virtual device ID 603 from the row in which “sv1” is stored in the redundancy ID 604. Therefore, the distributed arrangement device 10 creates “Sv1∪Sv1 ′” by combining the extracted “Sv1” and “Sv1 ′” with the logical sum symbol “∪”.

  Furthermore, the distributed arrangement device 10 extracts “Sv2” and “Sv2 ′” as the virtual device ID 603 from the row in which “sv2” is stored in the redundancy ID 604. Therefore, the distributed arrangement apparatus 10 creates “Sv2∪Sv2 ′” by combining the extracted “Sv2” and “Sv2 ′” with the logical sum symbol “∪”.

  Then, the distributed arrangement apparatus 10 combines the created Formula 1, the created “Sv1∪Sv1 ′” and the created “Sv2∪Sv2 ′” with the logical product symbol “∩”, thereby expressing the virtual system usable expression data (Formula Create 2).

  Next, the distributed placement device 10 uses the physical system available representation data based on the virtual system available representation data, the disk device system placement data table 65, the server device system placement data table 66, and the network device system placement data table 67. Is created (S702). The physical system usable expression data is a logical expression representing the state of each physical device in a state where the entire virtual system can operate normally.

  Specifically, the distributed arrangement device 10 replaces the virtual device ID included in the virtual system usable expression data with the physical device ID of the physical device in which the virtual device identified by the virtual device ID is arranged. As a result, the distributed arrangement device 10 creates physical system usable expression data.

  For example, the distributed arrangement device 10 replaces “Dv1” with “Dp1” based on the disk device system arrangement data table 65. Next, the distributed arrangement device 10 sets “Sv1” to “Sp1”, “Sv1 ′” to “Sp2”, “Sv2” to “Sp2”, “ Replace “Sv2 ′” with “Sp1”. Next, the distributed arrangement device 10 replaces “Nv1” with “Np1” based on the network device system arrangement data table 67. Thereby, the distributed arrangement device 10 creates physical system usable expression data (Formula 3).

  Next, the distributed arrangement device 10 creates a physical device list 681 of the available truth value table 68 based on the created physical system available expression data (S703). Specifically, the distributed arrangement device 10 indicates the state of the physical device identified by the physical device ID included in the created physical system available expression data in one column included in the physical device list 681 of the available truth value table 68. It shows with.

  Here, the distributed arrangement device 10 includes the physical disk device 50 identified by “Dp1” included in the physical system usable expression data, the physical server device 40 identified by “Sp1”, and the physical server identified by “Sp2”. Each state of the physical network device 30 identified by the device 40 and “Np1” is indicated by one column included in the physical device list 681 of the available truth value table 68.

  Next, the distributed arrangement device 10 stores “0” or “1” in each column included in the physical device list 681 of the available truth table 68. At this time, the distributed arrangement device 10 stores in the physical device list 681 of the available truth value table 68 all combinations in which the rows included in the available truth value table 68 do not overlap. That is, the distributed arrangement device 10 stores all combinations of the states of the respective physical devices in the physical device list 681 of the available truth value table 68. One row included in the physical device list 681 of the available truth table 68 corresponds to one combination of the states of the physical devices.

  For example, the distributed arrangement device 10 adds (0, 0, 0, 0), (0, 0, 0, 1) to (Dp1, Sp1, Sp2, Np1) in the physical device list 681 of the available truth table 68. (0,0,1,0), (0,0,1,1), (0,1,0,0), (0,1,0,1), (0,1,1,0), (0, 1, 1, 1), (1, 0, 0, 0), (1, 0, 0, 1), (1, 0, 1, 0), (1, 0, 1, 1), (1,1,0,0), (1,1,0,1), (1,1,1,0) and (1,1,1,1) are stored.

  Next, the distributed arrangement device 10 selects all the rows of the available truth value table 68 in order. Next, the distributed arrangement device 10 extracts the physical device list 681 of the selected row. Next, the distributed arrangement device 10 replaces the physical device ID included in the created physical system usable expression data with the value included in the extracted physical device list 681. Thereby, the distributed arrangement device 10 creates a logical expression.

  For example, it is assumed that the distributed arrangement device 10 selects a row in which (0, 0, 1, 0) is stored in (Dp1, Sp1, Sp2, Np1) of the physical device list 681. In this case, the distributed arrangement device 10 replaces “Dp1” with “0”, “Sp1” with “0”, “Sp2” with “1”, and “Np1” with “0”. Thereby, the distributed arrangement device 10 creates a logical expression (Formula 4).

  Next, the distributed arrangement device 10 calculates the created logical expression. Then, the distributed arrangement device 10 stores the calculated result in the truth value 682 of the selected row.

  For example, the distributed arrangement device 10 stores “0”, which is the calculation result of the created logical expression (Formula 4), in the truth value 682 of the selected row.

  The distributed arrangement device 10 stores values in the truth values 682 of all the rows by selecting all the rows of the available truth value table 68 in order.

  Next, the distributed arrangement device 10 sequentially selects rows in which “1” is stored in the truth value 682 from the available truth value table 68. Next, the distributed arrangement device 10 extracts the physical device list 681 from the selected row. Next, the distributed arrangement device 10 creates a term of the event occurrence probability calculation formula based on each value included in the extracted physical device list 681.

  Specifically, the distributed arrangement device 10 sequentially selects values included in the extracted physical device list 681. Next, the distributed arrangement device 10 selects, from the physical system device data table 63, a row in which the physical device identifier whose state is indicated by the selected value matches the physical device ID 633 of the physical system device data table 63. Next, the distributed arrangement device 10 extracts the device operation rate 634 from the selected row.

  When the selected value is “1”, the distributed arrangement device 10 sets the extracted device operation rate 634 as a term of the event occurrence probability calculation formula. On the other hand, when the selected value is “0”, the distributed arrangement device 10 sets a value obtained by subtracting the extracted device operation rate 634 from 1 as a term of the event occurrence probability calculation formula.

  Next, the distributed arrangement device 10 creates an equation that integrates all the created terms and sets it as an event occurrence probability calculation equation.

  For example, it is assumed that the distributed arrangement device 10 selects a row in which (1, 0, 1, 1) is stored in (Dp1, Sp1, Sp2, Np1) of the physical device list 681.

  In this case, the distributed arrangement device 10 extracts “a11” from the physical system device data table 63 as the operation rate of the physical disk device 50 identified by “Dp1”. Since the value indicating the state of the physical disk device 50 among the values included in the physical device list 681 is “1”, the distributed arrangement device 10 uses the extracted “a11” as a term of the event occurrence probability calculation formula.

  Next, the distributed arrangement device 10 extracts “a21” from the physical system device data table 63 as the operation rate of the physical server device 40 identified by “Sp1”. Since the value indicating the state of the physical server device 40 among the values included in the physical device list 681 is “0”, the distributed arrangement device 10 uses the value obtained by subtracting the extracted “a21” from “1” as the event. It is a term of the occurrence probability calculation formula.

  Next, the distributed arrangement device 10 extracts “a22” from the physical system device data table 63 as the operation rate of the physical server device 40 identified by “Sp2”. Since the value indicating the state of the physical server device 40 among the values included in the physical device list 681 is “1”, the distributed arrangement device 10 uses the extracted “a22” as a term of the event occurrence probability calculation formula.

  Next, the distributed arrangement device 10 extracts “a31” from the physical system device data table 63 as the operation rate of the physical network device 30 identified by “Np1”. Since the value indicating the state of the physical network device 30 among the values included in the physical device list 681 is “1”, the distributed arrangement device 10 sets the extracted “a31” as a term of the event occurrence probability calculation formula.

  Then, the distributed placement device 10 creates an equation that integrates all the created terms and sets it as an event occurrence probability calculation equation (Equation 5).

  Next, the distributed arrangement device 10 calculates the created event occurrence probability calculation formula. Thereby, the distributed arrangement device 10 calculates the event occurrence probability corresponding to the physical device list 681 of the row selected from the available truth table 68 (S704). The distributed arrangement device 10 stores the calculated event occurrence probability in the event occurrence probability 683 of the row selected from the available truth value table 68.

  Next, the distributed arrangement device 10 calculates the total value of the event occurrence probabilities 683 of all the rows in the available truth value table 68. Thereby, the distributed placement apparatus 10 calculates the operating rate of the virtual system selected in step S700 (S705).

  Next, the distributed arrangement device 10 creates a new row in the system availability table 69. Next, the distributed arrangement device 10 stores the identifier of the virtual system selected in Step S700 in the virtual system ID of the created new row. Next, the distributed arrangement device 10 stores the calculated operating rate of the virtual system in the created virtual system operating rate 692 of the new row. As a result, the distributed arrangement apparatus 10 stores the identifier of the virtual system selected in step S700 in association with the calculated operating rate of the virtual system in the system availability table 69.

  Next, the distributed arrangement device 10 determines whether all virtual systems realized by the computer system have been selected in step S700 (S706). If not all the virtual systems have been selected, the distributed placement apparatus 10 returns to step S700 and repeats the process.

  On the other hand, when all the virtual systems have been selected, the distributed arrangement device 10 calculates a system arrangement evaluation value based on the virtual system importance degree table 62, the system availability table 69, and Equation 6 (S707).

  Note that i is a virtual system ID. Wi is the importance of the virtual system identified by i, and the system importance 622 of the virtual system importance table 62 is used. Ai is the operating rate of the virtual system identified by i, and the virtual system operating rate 692 of the system availability table 69 is used.

  Then, the distributed arrangement device 10 ends the system arrangement evaluation value calculation process.

  In the present embodiment, the operating rate is used as the reliability characteristic value. However, the reliability characteristic value may be any value as long as it shows reliability. For example, the reliability characteristic value is a failure rate.

  According to the present embodiment, the distributed arrangement device 10 calculates the system arrangement evaluation value based on the reliability characteristic value of the physical device. Thereby, the distributed arrangement device 10 can provide an arrangement pattern of virtual devices to physical devices so as to improve the reliability of the entire virtual system. By arranging the virtual device according to the provided arrangement pattern, the reliability of the entire virtual system can be improved.

It is a block diagram of the structure of the computer system of embodiment of this invention. It is a block diagram of a configuration of a physical network device provided in the computer system according to the embodiment of this invention. It is a block diagram of the structure of the physical server apparatus with which the computer system of embodiment of this invention is equipped. It is a block diagram of a configuration of a physical disk device provided in the computer system according to the embodiment of this invention. It is a block diagram of the virtual system apparatus data table memorize | stored in the distributed arrangement apparatus of embodiment of this invention. It is a block diagram of the virtual system connection data table memorize | stored in the distributed arrangement apparatus of embodiment of this invention. It is a block diagram of the virtual system importance table memorize | stored in the distributed arrangement apparatus of embodiment of this invention. It is a block diagram of the physical system apparatus data table memorize | stored in the distributed arrangement apparatus of embodiment of this invention. It is a block diagram of the physical system connection data table memorize | stored in the distributed arrangement apparatus of embodiment of this invention. It is a block diagram of the system arrangement | positioning data table for disk apparatuses memorize | stored in the distributed arrangement apparatus of embodiment of this invention. It is a block diagram of the system arrangement | positioning data table for server apparatuses memorize | stored in the distributed arrangement apparatus of embodiment of this invention. It is a block diagram of the system arrangement | positioning data table for network devices memorize | stored in the distributed arrangement apparatus of embodiment of this invention. It is a block diagram of the available truth value table memorize | stored in the distributed arrangement apparatus of embodiment of this invention. It is a block diagram of the system availability table memorize | stored in the distributed arrangement apparatus of embodiment of this invention. It is a flowchart of the system arrangement | positioning process performed by the distributed arrangement apparatus of embodiment of this invention. It is explanatory drawing of the virtual system arrangement | positioning candidate screen displayed on the distributed arrangement apparatus of embodiment of this invention. It is a flowchart of the system arrangement | positioning evaluation value calculation process performed by the distributed arrangement apparatus of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Distributed arrangement apparatus 20 Network 30 Physical network apparatus 40 Physical server apparatus 50 Physical disk apparatus 60 Virtual system apparatus data table 61 Virtual system connection data table 62 Virtual system importance table 63 Physical system apparatus data table 64 Physical system connection data table 65 Disk System arrangement data table for apparatus 66 System arrangement data table for server apparatus 67 System arrangement data table for network apparatus 68 Available truth table 69 System availability table 101 Processor 102 Disk apparatus 103 Network apparatus 104 Input apparatus 105 Display apparatus 106 Memory 111 Virtual system Configuration acquisition unit 112 Physical system configuration acquisition unit 113 System arrangement data management unit 114 System arrangement execution instruction unit 121 system arrangement data creation unit 122 connection constraint condition determination unit 123 compatibility condition determination unit 124 system reliability characteristic value calculation unit 125 system arrangement evaluation value calculation unit

Claims (16)

A distributed placement device connected via a network to a plurality of physical devices on which virtual devices constituting a virtual system are placed,
Create system placement information indicating the correspondence between the virtual device and the physical device on which the virtual device is placed,
The created system arrangement information, the correspondence between the virtual system and the virtual device constituting the virtual system, the redundancy relationship between the virtual devices, and the reliability characteristic value of the physical device are referred to. A distributed placement device, wherein a reliability characteristic value of the virtual system is calculated when the virtual device is placed on the physical device according to system placement information. With reference to the created system arrangement information and the correspondence between the virtual system and the virtual device constituting the virtual system, all physical devices on which the virtual device constituting the virtual system is arranged are identified. ,
Referring to the redundant relationship between the virtual devices, identify all combinations of the states of the identified physical devices that are in a state in which the virtual system operates normally,
With reference to the reliability characteristic value of the physical device, the probability of occurrence of each combination of states of the identified physical device is calculated,
Calculating a reliability characteristic value of the virtual system when the virtual device is arranged in the physical device in accordance with the created system arrangement information by summing all the calculated occurrence probabilities The distributed arrangement apparatus according to claim 1. The physical device includes at least one of a physical server device, a physical network device, and a physical disk device,
The virtual device includes at least one of a virtual server device arranged in the physical server device, a virtual network device arranged in the physical network device, and a virtual network device arranged in the physical disk device. The distributed arrangement apparatus according to claim 1.   The distributed arrangement apparatus according to claim 1, wherein the reliability characteristic value is either an operation rate or a failure rate.   The distributed arrangement apparatus according to claim 1, wherein a system arrangement evaluation value for evaluating the created system arrangement information is calculated based on a reliability characteristic value calculated for each virtual system. Creating a plurality of the system arrangement information,
For each of the created system arrangement information, calculate the system arrangement evaluation value,
6. The distributed arrangement apparatus according to claim 5, wherein among the plurality of created system arrangement information, system arrangement information having a good calculated system arrangement evaluation value is output.   6. The distributed arrangement apparatus according to claim 5, wherein the system arrangement evaluation value is calculated based on a value obtained by integrating the importance of the virtual system and the calculated reliability characteristic value of the virtual system. When the virtual device is arranged in the physical device according to the created system arrangement information based on the virtual connection relationship between the virtual devices and the physical connection relationship between the physical devices, the virtual device Determine whether or not the virtual connection relationship between them is maintained,
The distributed arrangement apparatus according to claim 1, wherein a reliability characteristic value of the virtual system is not calculated when a virtual connection relationship between the virtual apparatuses is not maintained. A virtual device placement method in a distributed placement device connected via a network to a plurality of physical devices in which virtual devices constituting a virtual system are placed,
Processing for creating system placement information indicating correspondence between the virtual device and the physical device on which the virtual device is placed;
Referring to the created system arrangement information, the correspondence between the virtual system and the virtual device constituting the virtual system, the redundancy relationship between the virtual devices, and the reliability characteristic value of the physical device, the created A virtual device placement method comprising: calculating a reliability characteristic value of the virtual system when the virtual device is placed on the physical device according to system placement information. In the process of calculating the reliability characteristic value of the virtual system,
With reference to the created system arrangement information and the correspondence between the virtual system and the virtual device constituting the virtual system, all physical devices on which the virtual device constituting the virtual system is arranged are identified. ,
Referring to the redundant relationship between the virtual devices, identify all combinations of the states of the identified physical devices that are in a state in which the virtual system operates normally,
With reference to the reliability characteristic value of the physical device, the probability of occurrence of each combination of states of the identified physical device is calculated,
Calculating a reliability characteristic value of the virtual system when the virtual device is arranged in the physical device in accordance with the created system arrangement information by summing all the calculated occurrence probabilities The virtual device arrangement method according to claim 9. The physical device includes at least one of a physical server device, a physical network device, and a physical disk device,
The virtual device includes at least one of a virtual server device arranged in the physical server device, a virtual network device arranged in the physical network device, and a virtual network device arranged in the physical disk device. The virtual device arrangement method of the virtual device according to claim 9.   The virtual device arrangement method according to claim 9, wherein the reliability characteristic value is either an operation rate or a failure rate.   10. The method according to claim 9, further comprising a process of calculating a system layout evaluation value for evaluating the created system layout information based on a reliability characteristic value calculated for each virtual system. Virtual device placement method. In the process of creating the system arrangement information, a plurality of the system arrangement information are created,
In the process of calculating the system layout evaluation value, the system layout evaluation value is calculated for each of the created plurality of system layout information,
The virtual device arrangement method according to claim 13, further comprising a process of outputting system arrangement information having a good calculated system arrangement evaluation value among the plurality of created system arrangement information.   In the process of calculating the system layout evaluation value, the system layout evaluation value is calculated based on a value obtained by integrating the importance of the virtual system and the calculated reliability characteristic value of the virtual system. The virtual device arrangement method according to claim 13. Further, when the virtual device is arranged in the physical device according to the created system arrangement information based on the virtual connection relationship between the virtual devices and the physical connection relationship between the physical devices, A process of determining whether or not a virtual connection relationship between virtual devices is maintained;
The virtual device arrangement method according to claim 9, wherein when a virtual connection relationship between the virtual devices is not maintained, a process of calculating a reliability characteristic value of the virtual system is not performed.

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