Abstract:
A processing apparatus includes a memory, and a processor coupled to the memory and configured to acquire first data that indicates correspondence relationship between a first address given to a first adapter of a first device and a first bus number given to a first bus coupled to the first adapter, acquire second data that indicates correspondence relationship between a second address given to a second adapter of a first device and a second bus number given to a second bus coupled to the second adapter, acquire third data that indicates correspondence relationship between the first address and a port number given to a port of a second device, the port being coupled to the first adapter with the first bus, and when the second bus number is identical to the first bus number, generate fourth data that indicates that the second adapter is coupled to the port.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2013-054641, filed on Mar. 18, 2013, the entire contents of which are incorporated herein by reference. 
     FIELD 
     The embodiments discussed herein are related to a technique of generating coupling information of a network. 
     BACKGROUND 
     Typically, Link Layer Discovery Protocol (LLDP) is utilized to obtain information on the coupling between a port of a network switch and a network adapter of an apparatus coupled to the port. The LLDP is a protocol for performing various kinds of setting or administration by detecting a coupling destination node. For example, as illustrated in  FIG. 1 , when a network adapter  1001  of a physical server and a port n of a network switch sw 1  are coupled to each other, the LLDP enables the network switch sw 1  to recognize that a media access control (MAC) address of the network adapter  1001  to which the network switch sw 1  is coupled indicates “A”. When the configuration is simple as illustrated in  FIG. 1 , in which the network adapter  1001  is not logically divided and the physical server includes only one network adapter, the coupling relation may be ascertained by searching for the physical server that has the MAC address “A” in another manner. 
     In  FIG. 2 , a physical network adapter  1002  is divided into a plurality of logical network adapters  1002   a ,  1002   b ,  1002   c , and  1002   d . The MAC addresses of the logical network adapters  1002   a ,  1002   b ,  1002   c , and  1002   d  indicate “A”, “B”, “C”, and “D”, respectively. When the MAC address of the coupling destination node is acquired in the network switch sw 1  via the LLDP, only one MAC address, which is for example, the MAC address “A”, may be obtained while it is unclear which port of which network switch the nodes corresponding to the other MAC addresses “B” to “D” are coupled to. In such a case, when some network failure occurs, the range in which a virtual machine implemented on a hypervisor exerts influence, or the like may not be grasped properly. Examples of related art include Japanese Laid-open Patent Publication No. 2011-203810, Japanese Laid-open Patent Publication No. 2007-316724, and Japanese Laid-open Patent Publication No. 2010-124129. 
     SUMMARY 
     According to an aspect of the invention, a processing apparatus includes a memory, and a processor coupled to the memory and configured to acquire first data that indicates correspondence relationship between a first address given to a first adapter of a first device and a first bus number given to a first bus coupled to the first adapter, acquire second data that indicates correspondence relationship between a second address given to a second adapter of a first device and a second bus number given to a second bus coupled to the second adapter, acquire third data that indicates correspondence relationship between the first address and a port number given to a port of a second device, the port being coupled to the first adapter with the first bus, and when the second bus number is identical to the first bus number, generate fourth data that indicates that the second adapter is coupled to the port. 
     The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  illustrates an example of a simple coupling relation; 
         FIG. 2  illustrates an example of a complicated coupling relation; 
         FIG. 3  illustrates a coupling state in a network; 
         FIG. 4  is a function block diagram illustrating an information processing apparatus according to a first embodiment; 
         FIG. 5  illustrates a specific example of a coupling state according to the first embodiment; 
         FIG. 6  is a diagram for explaining location information on a peripheral component interconnect (PCI) bus; 
         FIG. 7  is a flowchart illustrating a process according to the first embodiment; 
         FIG. 8  illustrates an example of server data according to the first embodiment; 
         FIG. 9  illustrates an example of switch data according to the first embodiment; 
         FIG. 10  is a flowchart illustrating a process according to the first embodiment; 
         FIG. 11  illustrates a first state of a coupling data table according to the first embodiment; 
         FIG. 12  illustrates a second state of the coupling data table according to the first embodiment; 
         FIG. 13  is a flowchart illustrating a process according to the first embodiment; 
         FIG. 14  illustrates a third state of the coupling data table according to the first embodiment; 
         FIG. 15  illustrates a coupling state in a network; 
         FIG. 16  illustrates relations among virtual machines, virtual switches, and logical switch adapters; 
         FIG. 17  is a function block diagram illustrating an information processing apparatus according to a second embodiment; 
         FIG. 18  illustrates an example of server data according to the second embodiment; 
         FIG. 19  illustrates an example of switch data according to the second embodiment; 
         FIG. 20  is a flowchart illustrating a process according to the second embodiment; 
         FIG. 21  is a flowchart illustrating a process according to the second embodiment; 
         FIG. 22  illustrates a first state of a coupling data table according to the second embodiment; 
         FIG. 23  illustrates a second state of the coupling data table according to the second embodiment; and 
         FIG. 24  is a function block diagram illustrating a computer. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     First Embodiment 
     In a first embodiment, as illustrated in  FIG. 3 , a plurality of physical servers are coupled to a plurality of network switches while one or more of the physical servers include a network adapter logically divided. An information processing apparatus  100 , which performs main processes in the present embodiment, is coupled to each of the physical servers and each of the network switches through a local area network (LAN) for management  200 . 
       FIG. 4  is a function block diagram illustrating the information processing apparatus  100 . As described above, the information processing apparatus  100  is coupled to the LAN for management  200  to which the plurality of physical servers and network switches are coupled, and includes a processing unit  101 , a first data acquiring unit  102 , a second data acquiring unit  103 , a data storing unit  104 , and an output unit  105 . 
     The first data acquiring unit  102  acquires server data from each hypervisor and causes the server data to be stored in the data storing unit  104 . The second data acquiring unit  103  acquires switch data from each network switch and causes the switch data to be stored in the data storing unit  104 . The processing unit  101  generates coupling information of the network by performing processes using the server data and the switch data stored in the data storing unit  104 , and causes the generated coupling information to be stored in the data storing unit  104  as, for example, a coupling data table. The output unit  105  outputs the coupling information of the network stored in the data storing unit  104  to, for example, a display device, a printing device, or another computer coupled through the network. 
     For example, the coupling state illustrated in  FIG. 5  is assumed so as to facilitate the description below. That is, the physical server managed by a hypervisor hv 1  includes network adapters  1010  to  1012 . The network adapter  1010  is logically divided into four while the network adapters  1011  and  1012  are not logically divided. The physical network adapter  1010  includes logical network adapters na 1  to na 4 , which have MAC addresses of “A”, “B”, “C”, and “D”, respectively. The hypervisor hv 1  may recognize na 1  to na 4  as identifiers. On the side of the hypervisor hv 1 , the physical network adapter  1011  is identified as a network adapter corresponding to an identifier na 5 , and the physical network adapter  1012  is identified as a network adapter corresponding to an identifier na 6 . 
     The network adapters are coupled to peripheral component interconnect (PCI) buses, and each logical device is provided with location information on the PCI bus. For example, the logical network adapter na 1  is provided with location information “02:00.0”, the logical network adapter na 1  is provided with location information “02:00.1”, the logical network adapter na 3  is provided with location information “02:00.2”, the logical network adapter na 4  is provided with location information “02:00.3”, the logical network adapter na 5  is provided with location information “04:00.0”, and the logical network adapter na 6  is provided with location information “06:00.0”. In the location information, as illustrated in  FIG. 6 , xx represents a bus number, yy represents a device number, and z represents a function number. The logical network adapters na 1  to na 4  of the identical physical network adapter  1010  have an identical bus number. In the example of  FIG. 5 , all the bus numbers of the logical network adapters na 1  to na 4  indicate “02”, which is not identical with the bus numbers in the location information on the physical network adapters  1011  and  1012  different from the physical network adapter  1010 . 
     Furthermore, in this example, the physical network adapter  1010  is coupled to a port n of a network switch sw 1 , the physical network adapter  1011  is coupled to a port m of a network switch sw 2 , and the physical network adapter  1012  is coupled to a port p of a network switch sw 3 . 
     Referring now to  FIGS. 7 to 14 , the operations performed by the information processing apparatus  100  are described. First, the first data acquiring unit  102  outputs a request to each of the hypervisors to acquire server data from the hypervisors, and causes the server data to be stored in the data storing unit  104  (S 1 ). In the case illustrated in  FIG. 5 , the data illustrated in  FIG. 8  is acquired from the hypervisor hv 1 . The data in the example of  FIG. 8  includes a plurality of combinations, each of which is made up of an identifier (ID) of a logical network adapter, a MAC address, and location information, and an identifier of a hypervisor. 
     After that, the second data acquiring unit  103  outputs a request to each of the network switches to acquire switch data from the network switches, and causes the switch data to be stored in the data storing unit  104  (S 3 ). In the case illustrated in  FIG. 5 , the data illustrated in  FIG. 9  is acquired from the network switches. The data in the example of  FIG. 9  includes a plurality of combinations, each of which is made up of a switch ID, a port number, and a coupling destination MAC address. 
     After that, the processing unit  101  identifies one unprocessed network switch in the switch data (S 5 ). 
     Also, the processing unit  101  identifies one unprocessed port of the identified network switch in the switch data (S 7 ). 
     Additionally, the processing unit  101  identifies one unprocessed hypervisor in the server data (S 9 ). 
     Furthermore, the processing unit  101  identifies one unprocessed network adapter server data managed by the identified hypervisor (S 11 ). 
     After that, the processing unit  101  compares the coupling destination MAC address of the port identified in S 7  and the MAC address of the network adapter identified in S 11  (S 13 ). After that, the process moves on to the process of  FIG. 10  through a terminal A. 
     The process of  FIG. 10  is described now. The processing unit  101  determines whether the MAC addresses compared in S 13  match (S 15 ). When the MAC addresses do not match, the process moves on to the process of  FIG. 13  through a terminal B. 
     When the MAC addresses match, the processing unit  101  causes the switch ID, the port number, the hypervisor ID, and the MAC address of the identified network adapter to be registered in the coupling data table of the data storing unit  104  (S 17 ). For example, when the switch ID “sw 1 ”, the port number “n”, the coupling destination MAC address “A”, the hypervisor ID “hv 1 ”, the network adapter ID “na 1 ”, and the MAC address “A” are processed, the data illustrated in  FIG. 11  is stored in the coupling data table. 
     Also, the processing unit  101  identifies the PCI bus number of the network adapter identified in S 11  based on the server data (S 19 ). In the above-described example, “02” is identified as indicated in  FIG. 8 . 
     After that, the processing unit  101  searches for another network adapter that has a PCI bus number identical with the identified bus number and is managed by the identified hypervisor in the server data (S 21 ). In the above-described example, when another network adapter ID with the PCI bus number “02” is searched for except “na 1 ” in the location information with which the hypervisor ID “hv 1 ” is correlated, “na 1 ”, “na 3 ”, and “na 4 ” are obtained. 
     After that, the processing unit  101  determines whether or not another network adapter has been extracted in S 21  (S 23 ). For example, when processing the network adapter ID “na 5 ” or “na 6 ”, another network adapter, which satisfies such conditions, may not be extracted. When another network adapter, which satisfies such conditions, is not extracted, the process moves on to the process of  FIG. 13  through the terminal B. 
     When another network adapter is extracted, the processing unit  101  causes the switch ID, the port number, the hypervisor ID, and the MAC address of the another network adapter having been extracted to be registered in the coupling data table in the data storing unit  104  (S 25 ). Then, the process moves on to the process of  FIG. 13  through the terminal B. 
     In the above-described example, the MAC address “B” corresponding to the network adapter “na 2 ”, the MAC address “C” corresponding to the network adapter “na 3 ”, and the MAC address “D” corresponding to the network adapter “na 4 ” are registered. That is, the coupling data table is changed as illustrated in  FIG. 12 .  FIG. 12  illustrates that four different MAC addresses are registered even when the switch IDs, the port numbers, and the hypervisor IDs each are identical. 
     Since the MAC addresses corresponding to the network adapters “na 1 ”, “na 3 ”, and “na 4 ” extracted in S 21  have already been registered in the coupling data table, the network adapters “na 2 ”, “na 3 ”, and “na 4 ” may be treated as processed network adapters in S 11 . 
     The process of  FIG. 13  is described now. The processing unit  101  determines whether an unprocessed network adapter is present in the server data (S 27 ). When an unprocessed network adapter is present, the process returns to S 11  through a terminal C. When no unprocessed network adapter is present, the processing unit  101  determines whether an unprocessed hypervisor is present in the server data (S 29 ). When an unprocessed hypervisor is present, the process returns to S 9  through a terminal D. When no unprocessed hypervisor is present, the processing unit  101  determines whether an unprocessed port is present in the switch data (S 31 ). When an unprocessed port is present, the process returns to S 7  through a terminal E. When no unprocessed port is present, the processing unit  101  determines whether an unprocessed network switch is present in the switch data (S 33 ). When an unprocessed network switch is present, the process returns to S 5  through a terminal F. When no unprocessed network switch is present, the output unit  105  outputs the coupling data table (S 35 ) and the process ends. 
     The coupling data table illustrated in  FIG. 14  may be obtained by performing the processes described above. Since the physical network adapters  1011  and  1012  are not logically divided, addition by one record is performed for the network switches sw 2  and sw 3 . 
     When the coupling data table described above may be obtained, the network configuration may be correctly grasped and in case of failure occurrence, for example, the failure causing portion or the range in which the failure exerts influence may be easily identified. Also, since how the network is logically divided may be known, resources may be utilized advantageously by, for example, changing the virtualization environment so that the virtualization environment is suitable for the allocation of bands for the logical division. That is, the operational management of the network may be facilitated and costs desired for the operational management may be reduced. 
     Second Embodiment 
     In a second embodiment, as illustrated in  FIG. 15 , one physical network card  1500  is coupled to a physical server and the physical network card  1500  is provided with two physical network adapters  1510  and  1520 , each of which is logically divided. That is, a hypervisor hv 1  grasps that logical network adapters na 11  to na 14  are provided. The MAC address of the logical network adapter na 11  indicates “A” and the PCI location information on the logical network adapter na 11  indicates “02:00.0”. The MAC address of the logical network adapter na 12  indicates “B” and the PCI location information on the logical network adapter na 12  indicates “02:00.1”. The MAC address of the logical network adapter na 13  indicates “C” and the PCI location information on the logical network adapter na 13  indicates “02:00.2”. The MAC address of the logical network adapter na 14  indicates “D” and the PCI location information on the logical network adapter na 14  indicates “02:00.3”. A port n of a network switch sw 1  is coupled to the physical network adapter  1510 , and a port m of a network switch sw 2  is coupled to the physical network adapter  1520 . 
     In the state in which one network card is provided with a plurality of physical network adapters as described above, the PCI location information indicates the identical bus numbers and this situation may not be handled in the first embodiment. 
     However, as illustrated in  FIG. 16 , the hypervisor hv 1  grasps the relations between virtual network adapters of virtual machines and the logical network adapters of the network card. In the example of  FIG. 16 , a virtual network adapter  1  of the virtual machine is coupled to the logical network adapter na 11  through a virtual switch vsw 1 , virtual network adapters  2  and  3  of the virtual machines are coupled to the logical network adapter na 12  through a virtual switch vsw 2 . Furthermore, a virtual network adapter  4  of the virtual machine is coupled to the logical network adapter na 13  through a virtual switch vsw 3 , and a virtual network adapter  5  of the virtual machine is coupled to the logical network adapter na 14  through a virtual switch vsw 4 . Each of the virtual network adapters is provided with an IP address. 
     When data on the virtual coupling relation described above may be acquired, even if the bus numbers in the PCI location information are identical, it may be found that the port n of the network switch sw 1  is unable to communicate with the virtual network adapter  4  that has an IP address of “4.4.4.4” and the virtual network adapter  5  that has an IP address of “5.5.5.5”. Similarly, it may be found that the port m of the network switch sw 2  is unable to communicate with the virtual network adapter  1  that has an IP address of “1.1.1.1”, the virtual network adapter  2  that has an IP address of “2.2.2.2”, and the virtual network adapter  3  that has an IP address of “3.3.3.3”. 
     When data on such virtual coupling relations may also be collected as the server data, a coupling data table may be generated. 
     Thus, an information processing apparatus  100   b  is configured as illustrated in  FIG. 17 . The information processing apparatus  100   b  differs from the information processing apparatus  100  according to the first embodiment, which is illustrated in  FIG. 4 , in that a ping execution instructing unit  106  is provided, and that since the contents of the server data to be acquired are different, a first data acquiring unit  102   b  is provided instead of the first data acquiring unit  102 , and that since the processes to be performed are partially different, a processing unit  101   b  is provided instead of the processing unit  101 . Additionally, another difference is that the network switch is provided with a ping executing unit  301  that executes a ping operation in accordance with an instruction from the ping execution instructing unit  106 . 
     Referring now to  FIGS. 18 to 23 , the processes performed by the information processing apparatus  100   b  are described. Among the processes according to the first embodiment, the process performed from the terminal A to the terminal B is replaced with the processes illustrated in  FIGS. 20 and 21 . The server data acquired by the first data acquiring unit  102   b  in S 1  is illustrated in  FIG. 18 . The data in the example of  FIG. 18  includes a plurality of combinations, each of which is made up of a network adapter ID, a MAC address, location information, a virtual switch ID, an IP address of a virtual network adapter, and a hypervisor ID. In the example of  FIG. 16 , two virtual network adapters corresponding to two respective IP addresses are coupled to the virtual switch vsw 2 . 
     The switch data acquired by a second data acquiring unit  103  according to the second embodiment are substantially the same in contents as the switch data acquired by the second data acquiring unit  103  according to the first embodiment, and when the coupling relations are made as illustrated in  FIG. 16 , the switch data illustrated in  FIG. 19  may be acquired. 
     The process performed after the terminal A is described now. The processing unit  101   b  determines whether the MAC addresses compared in S 13  match (S 41 ). When the MAC addresses do not match, the process moves on to the process of  FIG. 13  through the terminal B. 
     When the MAC addresses match, the processing unit  101   b  causes the switch ID, the port number, hypervisor ID, and the MAC address of the identified network adapter to be registered in the coupling data table in a data storing unit  104  (S 43 ). For example, when the switch ID “sw 1 ”, the port number “n”, the hypervisor ID “hv 1 ”, and the MAC address “A” of the network adapter “na 11 ” are processed, similar to the first embodiment, the data illustrated in  FIG. 11  is stored in the coupling data table. 
     The processing unit  101   b  identifies the PCI bus number of the network adapter identified in S 11  based on the server data (S 45 ). In the above-described example, “06” is identified as indicated in  FIG. 18 . 
     After that, the processing unit  101   b  searches for another network adapter that has a PCI bus number identical with the identified bus number and is managed by the identified hypervisor in the server data (S 47 ). In the above-described example, when another network adapter ID with the PCI bus number “06” is searched for except “na 11 ” in the location information with which the hypervisor ID “hv 1 ” is correlated, “na 12 ”, “na 13 ”, and “na 14 ” are obtained. 
     After that, the processing unit  101   b  determines whether or not another network adapter has been extracted in S 47  (S 49 ). In the example of  FIG. 18 , the network adapter that does not satisfy the conditions is not present and when the network adapter that satisfies the conditions is not extracted, the process moves on to the process of  FIG. 13  through the terminal B. 
     When another network adapter is extracted, the processing unit  101   b  acquires the IP address of the virtual network adapter coupled to the another network adapter having been extracted from the server data (S 51 ). When a plurality of virtual network adapters are correlated with the network adapter, such as “na 12 ” in  FIG. 18 , one representative IP address may be extracted instead of extracting a plurality of IP addresses. After that, the process moves on to the process of  FIG. 21  through a terminal G. 
     The processing unit  101   b  identifies one unprocessed IP address in the acquired IP addresses (S 53 ). Then, the processing unit  101   b  causes the ping execution instructing unit  106  to instruct the ping executing unit  301  to execute a ping operation for the identified IP address from the identified port of the identified network switch (S 55 ). The ping executing unit  301  of the identified network switch replies to the ping execution instructing unit  106  regarding the presence or absence of a response, and the ping execution instructing unit  106  notifies the processing unit  101   b  of the presence or absence of a response. 
     In the above-described example, there is a response from the IP address “2.2.2.2” or “3.3.3.3” correlated with the network adapter “na 12 ” while there is no response from the IP addresses “4.4.4.4” and “5.5.5.5” correlated with the network adapters “na 13 ” and “na 14 ”, respectively. 
     The processing unit  101   b  determines whether the notification indicating there is a response is received (S 57 ). When the notification indicating there is no response is received, the process moves on to S 61 . When the notification indicating there is a response is received, the processing unit  101   b  causes the switch ID, the port number, the hypervisor ID, and the MAC address of another network adapter extracted and correlated with the IP address from which there is a response to be registered in the coupling data table if they are unregistered (S 59 ). Then, the coupling data table illustrated in  FIG. 22  may be obtained. 
     After that, the processing unit  101   b  determines whether or not an unprocessed IP address is present in the IP addresses acquired in S 51  (S 61 ). When an unprocessed IP address is present, the process returns to S 53 . When no unprocessed IP address is present, the process moves on to the process of  FIG. 13  through the terminal B. 
     In the end, the coupling data table illustrated in  FIG. 23  may be obtained. 
     By performing the processes described above, the coupling data table may be obtained even when a plurality of physical network adapters exist in one network card and moreover, the physical network adapters are logically divided. 
     The present application is not limited to the embodiments described above. The function block diagrams in  FIGS. 4 and 17  are mere examples and may differ from the configurations of program modules. Furthermore, in the processes described above, some processes may be performed in a different order or a plurality of steps may be performed in parallel as long as the results of the processes remain unchanged. 
     The above-described information processing apparatuses  100  and  100   b  are computer apparatuses, in which for example, as illustrated in  FIG. 24 , memory  2501 , a central processing unit (CPU)  2503 , a hard disk drive (HDD)  2505 , a display controlling unit  2507  coupled to a display device  2509 , a drive device  2513  for a removable disc  2511 , an input device  2515 , and a communication controlling unit  2517  for being coupled to a network are coupled through a bus  2519 . An operating system (OS) and an application program for performing the processes according to the present embodiments are stored in the HDD  2505 , and when executed by the CPU  2503 , are read from the HDD  2505  to the memory  2501 . Depending on the processes of the application program, the CPU  2503  controls the display controlling unit  2507 , the communication controlling unit  2517 , and the drive device  2513 , which are thus caused to perform certain operations. In-process data is stored mainly in the memory  2501 , but may also be stored in the HDD  2505 . In the embodiments of the present application, the application program for performing the above-described processes is stored in the computer-readable removable disc  2511  and distributed, and installed from the drive device  2513  into the HDD  2505 . The application program may also be installed into the HDD  2505  via a network, such as the Internet, and the communication controlling unit  2517 . Such a computer apparatus implements various functions as described above when the hardware, such as the CPU  2503  and the memory  2501 , and the OS and a program, such as the application program, which are described above, cooperate systematically. 
     The above-described present embodiments may be rephrased as below. 
     The information processing method according to the present embodiments includes the processes of (A) acquiring first correlation data that includes a port identifier and a first address of a coupling destination device for each port of a communication device, (B) acquiring second correlation data that includes the first address and location information on a logical adapter for each logical adapter of the coupling destination device of the communication device, and (C) when the first correlation data and the second correlation data including the first addresses that match each other are detected, identifying another second correlation data that includes certain data identical to certain data included in the location information on the logical adapter, and generating coupling information on the coupling between the communication device and the coupling destination device based on the first correlation data and the detected second correlation data, which include the matching first addresses, and the another identified second correlation data. 
     To use the location information as described above may bring the coupling information even when the adapter is logically divided. 
     The above-described second correlation data may further include a second address of a virtual device correlated with the logical adapter. In this case, the above-described generation process may include (c1) causing the second address of the virtual device included in the another identified second correlation data to be accessed from a port of the communication device related to the first correlation data that includes the matching first address, and being notified of the presence or absence of a response, and (c2) generating the coupling information based on the presence or absence of a response. Then, even when the location information only is not sufficient for the distinction, the coupling information may be obtained desirably. 
     Also, the above-described generation process may be a process of generating coupling information based on the second correlation data that includes the second address from which there is a response and the first correlation data that includes the matching first address. 
     The above-described coupling information may further include data that correlates the identifier, the port identifier, and the first address of the communication device. Additionally, the identifier of the hypervisor or the identifier of the physical device may be correlated. 
     Furthermore, the above-described certain data may be the bus number. The identical bus numbers may indicate existence on the same physical adapter or adapter card. 
     A program for causing a computer to perform the above-described processes may be created, and the program is stored in a computer-readable recording medium or a storage device, which is for example, a flexible disc, an optical disc such as a compact disc read-only memory (CD-ROM), a magneto-optical disc, semiconductor memory such as ROM, or a hard disk. In-process data is temporarily saved in a storage device, such as random-access memory (RAM). 
     All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention. Although the embodiments of the present invention have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.