JP2001005702A - Computer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a computer connected to SAN to access as a file pieces of data on a storage device which is controlled by another computer, does not have a file converting function of absorbing differences between systems, and is connected to the same SAN. SOLUTION: When a backup computer 1030 tries to access a disk 1090 on SAN 1080 controlled by a host computer 1020 on a file level, the backup computer 1030 inquires the kind of the file system controlling the disk 1090 of the host computer 1020 and then a backup computer 1040 reads file access information out of the disk 1090 by using the file system, so that the backup computer 1030 can access the data on the disk 1090 as a file.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] 1. Field of the Invention [0002] The present invention relates to a computer system, and more particularly to a method of accessing storage connected to a SAN, and more particularly to a method of accessing data on storage on a SAN that is not managed by the user as a file. About.

2. Description of the Related Art Conventionally, a storage device is provided in a computer such as a file server by SCSI (Small Computer System I).
nterface) and so on. In order for other computers to access files on the storage device managed by the file server, be sure to use the file server and the LA connecting the computer and the file server.
It had to go through N (Local Area Netowrk). Therefore, when transferring large amounts of data, such as when backing up storage managed by a file server, LAN
The load has increased. To solve such a problem, St
The concept of an orage area network (hereinafter referred to as a SAN) has been proposed. Although SAN is a relatively new concept and has not been strictly defined yet, a network environment that connects one or more computers and one or more storage devices will be referred to as a SAN here. As a publicly known example of SAN, there is Nikkei Electronics 1998.5.4 No. 58-63. In order to back up data of a storage device on a SAN to a backup storage device connected to the same SAN, there is no need to go through a LAN, so that the load on the LAN is not increased. Further, when a plurality of computers are connected to the SAN, a storage device on the SAN can be shared between the computers. Also, some companies have announced that they will create hard disks with file format conversion capabilities to allow computers with different file systems to share files.

A storage device without a file conversion function for absorbing differences between file systems is connected to a SAN, and a computer that manages the storage device (initialization and reading / writing) Suppose another computer is also connected to the same SAN. At this time, since the computer that does not manage the storage device does not have the file management information on the storage device, there is a problem that data on the storage device cannot be directly accessed as a file. . An object of the present invention is to store data on a storage device connected to the same SAN, where a computer connected to the SAN is managed by another computer and does not have a file conversion function to absorb differences between file systems. Is to provide a scheme that allows access as

[Means for Solving the Problems] In order to achieve the above object, storage that is not managed by itself (it is on a SAN)
The computer that wants to access the above file (Computer A) asks the computer that manages the storage (Computer B) which file system is used to manage the storage, and Computer B manages the storage Notifying the computer A of the type of the file system being used, the computer A selects the file system that manages the storage, and reads out the file management information of the storage through the selected file system, so that the storage on the storage is To be accessible as a file. In order to achieve the above purpose, a computer (Computer A) who wants to access files on storage (on a SAN) that is not managed by himself / herself sends information on which file system that storage uses to the user. The computer A can access the data on the storage as a file by selecting the file system that manages the storage and reading the file management information of the storage through the selected file system To do. In order to achieve the above purpose, the computer (Computer A) who wants to access files on the storage (on the SAN) that is not managed by himself / herself uses the multiple file systems that Computer A can use. By trying to read the file management information, a file system that can access data on the storage as a file is selected. In order to achieve the above purpose, a computer (computer A) that wants to access files on storage (on a SAN) that is not managed by itself requires a file system that is stored in a fixed area on the storage in advance. By reading the file management information of the storage using the file system, the data on the storage can be accessed as a file.

(First Embodiment) FIG. 1 shows the present invention.
1 shows a computer system 1000 to which the present invention is applied. Compu
LAN system 1000 connects computers to each other.
0, host computer 1020, data backup
Do backup computer 1030 for storage
SAN1080, the network of the host computer
Disk 1090 to store the data of
1030 manages and stores backup data
Backup disk 1100 and backup tape 11
Consists of ten. The host computer 1020
File system A1040, a program that manages files
Is running and disk 1090 is the host computer
1020 is initialized using this file system A1040.
Reading and writing data. Backup computer
-For 1030, file system A 1040, file system B
1050, file system C1060, file system D1070
Four types of file systems are running. Backdoor
Backup disk 1100 and backup tape 1110
Backup computer 1030 has file system D1070
Is used to initialize and read / write data.
In this embodiment, the disk 1090 connected to the SAN 1080,
Backup disk 1100, backup tape 1110
Host computer according to the SAN1080 protocol
Computer 1020 and backup computer 1030
Physical access is still possible, but
Host computer viewed from the backup disk 1100
A file that manages the storage device, such as 1020
A computer without a system is
Because you do not know the structure of files and directories,
Data cannot be accessed as a file. Figure 2
Disk that stores data for host computer 1020
1090 is shown. Disk 1090 exchanges data with SAN1080
Hold the SAN port C1500 as the port to take
1500 is assigned SAN port address C1510
You. SAN108 with SAN port address C1510 as destination
The packet (data) on 0 is forwarded to SAN port C1500
You. File attributes and directories on disk 1090
File access information A153, which is management information such as configuration
Metadata storage area A1520 storing 0 and files
File storage area A1540 for storing data that is the substance of
There is. The file storage area A1540 has a backup
File 1550 is stored. On disk 1090
Files are stored in the host system using the file system A1040.
File created by computer 1020
System B1050, File system C1060, File system
It is assumed that access cannot be made with the system D1070. This embodiment
Backup managed by host computer 1020
The backup computer 1030 copies the target file 1550
Procedure for reading and backing up as a file
Will be explained. FIG. 3 shows the configuration of the host computer 1020.
Show. Host computer 1020 communicates with LAN 1010
It has LAN port A2000 as a communication port,
A2000 has LAN port address A2010. LAN port
Packets on LAN1010 with dress A2010 as destination
Transferred to LAN port A2000. Also, the host computer
1020 is a port for exchanging data with SAN1080.
It has AN port A2050 and SAN port A2050 has SAN port
Dress A2060 is assigned. SAN port address
Packets on SAN1080 with A2060 as the destination are
Forwarded to A2050. On host computer 1020
Let's take a look at multiple processes 2020,
The file system notification process 2030 that performs
You. File system A1 on host computer 1020
040 running and files issued by each process 2020
Access request is trapped by this file system A1040
Then, it is issued to the disk 1090 via the SAN1080. H
Access information storage area 2 managed by file system A1040
040 has file access information A1530.
Host computer 1020 on disk 1090
You can access the placed file. Figure 4
17 shows the configuration of a backup computer 1030. back
Upcomputer 1030 exchanges data with LAN1010
LAN port B2500 as a port for
Has LAN port address B2510. LAN port address B
Packets on LAN1010 with destination 2510 are
Transferred to B2500. Also, backup computer
1030 is a port for exchanging data with SAN1080.
It has AN port B2560 and SAN port B2560 has SAN port
Dress B2570 is assigned. SAN port address
Packets on SAN1080 with the destination B2570 as SAN
Forwarded to port B2560. Backup computer
-Multiple processes 2020 on 1030, instructions from users
Backup program that backs up data
Roses 2520 is running. Backup process 2520
Is an input table that stores the parameters entered by the user.
Manage Bull 2530. Backup computer 1030
File system A1040, file system B1050, file system
File system C1050 and file system D1070
File system is available. Backup con
Computer 1030 manages and stores backup data
Backup disk 1100 and backup tape
1110 is accessed using the file system D1070.
Can be accessed. File system D1070
Access information management area 2040 has a backup disk 1100
File access information B254 which is the above file management information
0 and the file management information on the backup tape 1110
Certain file access information C2550 has been read.
The backup computer 1030 uses this file access
On backup disk 1100 based on source information B2540
Files can be accessed, as well as
Backup tape 1110 based on file access information C2550
You can access the files located above.
In the initial state of this embodiment, the file system A1040
File system B1050, it on file system C1060
Any file is stored in each access information storage area 2040.
It is assumed that the access information has not been read. FIG.
Accessed from the backup computer 1030 and
Backup disk 1100 for storing backup data
Is shown. Backup disk 1100 is SAN1080
Holds SAN port D3000 as a port to exchange data
SAN port address D3010 is assigned to SAN port D3000.
Has been applied. The destination is SAN port address D3010
Packets on SAN1080 are transferred to SAN port D3000.
It is. File attributes on backup disk 1100
File information, which is management information such as
Metadata storage area B30 that stores access information B2540
20 and the file that stores the data that is the substance of the file
There is a storage area B3030. On backup disk 1100
The file was created by file system D1070.
File system A1040, file system B10
50, inaccessible with file system C1060
And Figure 6 shows the backup computer 1030
Backup data that is
2 shows the configuration of a tape 1110. Backup tape 1110
SAN port E3 as a port to exchange data with SAN1080
500 and the SAN port E3500 has the SAN port address E351
0 is assigned. Enter SAN port address E3510
The packet on SAN1080 that has the destination is SAN port E3500
Is forwarded to Files on backup tape 1110
File that is management information such as
Metadata storing file access information C2550
Stores area C3520 and the data that is the substance of the file
There is a file storage area C3530. Backup tape 111
The file on 0 is created by file system D1070
File system A1040, file system
B1050, file system C1060 cannot be accessed
And FIG. 18 shows that the user
To enter when instructing the backup
User input command 9500. `` Backup '' is for backup
Command name. "Hostabc" is the backup
Host computer 10 that manages the target file
20 names. "/Tmp/test.txt" is the backup
File of backup target file 1550 which is the target file
Is the path name. Thus, in this embodiment, the backup is performed.
Command to backup files
Enter the full path name and the name of the computer that manages it.
Specify as a parameter. Fig. 7 shows the user input
Backup command parameters and backup
The input table 2530 managed by the backup process 2520 is shown.
Input table 2530 is the name of the computer to be backed up
Information of 4000 and full path file name of backup target 4010
have. The backup process 2520 uses this information to
File backup process. Figure 8 shows the backup
Backup process 2520 on laptop computer 1030
To query the file system type,
Via LAN1010 to a computer that wants to know the file system
The query packet 4500 sent by the user is shown. Inquiry
Packet 4500 is sent to LAN port address 4510
Sender LAN port address 4515, file system inquiry
Command 4520, backup target full path file
It has information on the name 4010. FIG. 9 shows the host computer 1020.
The file system notification process 2030 on the
For the computer that received the system inquiry request,
This shows a notification packet 5000 sent via the LAN 1010. notification
Packet 5000 is sent to LAN port address 4510
Source LAN port address 4515, file system notification
Command 5010, backup target SAN port address 502
0, Information on file system type 5030 to be backed up
have. FIG. 10 shows the flow of the backup process 7500.
First, in step 7520, the user
Host computer 1020 manages
Target file 1550 on disk 1090
Instruct them to back up. Specifically, the user
-Enter the input command 9500. Input table 2530
Host computer as the backup target computer name 4000
Set “hostabc” which is the name of Pewter 1020,
Backup target full path file of input table 2530
The name 4010 contains the full path of the file 1550 to be backed up.
Set "/tmp/test.txt" as the file name. Next
In step 7540, the backup process 2520
Inquiry packet 45 based on information on input table 2530
00 and create host computer 1 via LAN1010.
Send to 020. LAN port for sending inquiry packet 4500
Port 4510 has the LAN port of the host computer 1020.
Port address A2010, and set it as the source LAN address 4515
Is the LAN port address of the backup computer 1030.
Specify B2510. And file system inquiry
Command 4520 and backup of input table 2530
Elephant full path file name 4010 inquiry packet 4500
set. Computer name to computer
Computer to obtain the LAN port address corresponding to
Refer to the table that associates LAN port addresses with
However, it is known technology that is not directly related to the present invention.
Therefore, detailed description is omitted. Host computer
The inquiry packet 4500 received by 1020 is
Passed to the stem notification process 2030. Step 7560
In the file system notification process 2030, the notification
Create a ket 5000. Send inquiry packet 4500
Source LAN port address 4515
Copy to the local LAN port address 4510 and notify packet 500
The source LAN port address 4515 of 0
Set the LAN port address A2010 that is the dress. So
Then the file system notification process 2030 is queried
Packet 4500 backup target full path file name 40
The backup target file 1550 indicated by 10 is stored
File system A104
Check the file access information A1530 managed by
Notification packet 5000 for SAN port address C of disk 1090
Set to the backup target SAN port address 5020
You. File system type 5030 to be backed up
Is the directory that stores the backup target file 1550.
Specify file system A1040 that manages disk 1090
However, this is
Information to manage is a file on the host computer 1020
Stored in the access information storage area 2040 of system A1040
File access information A1530
Understand. And the notification packet 5000 goes through LAN1010
Sent to the backup computer 1030
Up process 2520 receives. And then to step 7580
The backup process 2520
File system type 50 to be backed up for 5000
Based on 30 files 1550 to be backed up
That the file is managed by Stem A1040.
Similarly, the backup target SAN
File 15 based on the
It is known that 50 is stored on disk 1090.
You. Then, in step 7600, the backup
Process 2520 uses the file system A1040
Disk 109 in access information storage area 2040 of stem A1040
File stored in the metadata storage area A1520 on
Read access information A1530, and
Pewter 1030 corrects using file system A1040
To read and write files on disk 1090.
You. In step 7640, the backup process 2520
File system A1040
When a read request for file 1550 is issued, the file system
A1040 is 155 files to be backed up on disk 1090
Read 0 and pass to backup process 2520. last
In step 7660, the backup process 2520
The file to be backed up is
File 1550 to backup disk 1100
File system D1070 requests file access information.
Backup to disk 1100 based on
The file 1550 to be backed up is stored. As described above,
Backup computer 1030 is the host computer
-Backs stored on disk 1090 managed by 1020
1550 files to be backed up
Backup disk managed by computer 1030
Can be backed up to 1100. In this embodiment, the
Backup disk 1100 was shown as an example
However, the same process must be performed on the backup tape 1110.
File 1550 to be backed up
Needless to say, it can be done. In this embodiment,
Inquiry packet 4500 and notification packet 5000 are LAN1010
In this example, these packets are sent on SAN108.
The present invention can also be applied to the case of being transmitted with 0
Needless to say. In addition, the notification packet 5000
Backup instead of backup target SAN port address 5020
The name of the storage that stores the file to be
However, the present invention is applicable even if it does so. (Second Embodiment) In the first embodiment, the user
When you make a backup request for a
Computer managing the target file and the target file.
Although the full path name of the file was specified, the second embodiment
Storage that stores files to be upgraded
Name, full path name of target file, and target file
The user enters the type of file system that is running
Regarding the case, points different from the first embodiment will be described.
FIG. 19 shows a case where the user
User input command to enter when instructing backup
Shows Command A9520. "Backup" is a backup command
Name. "Diskabc" is a backup target
The name of the disk 1090 that stores the file to be stored. "/ T
mp / test.txt '' is the backup target file.
This is the full path name of the backup target file 1550. "science fiction
a '' is the file that manages the backup target file 1550.
Indicates the system type. Thus, in this embodiment, the battery
Backup file in response to the backup command.
The full path name of the file and the name of the storage that stores it,
Specify the file system type that manages the file.
Data. FIG. 11 shows a user input buffer.
Backup command parameters and backup
26 shows an input table A5500 managed by a process 2520.
The input table A5500 is the backup target storage name 502
0 and backup target full path file name 4010, backup
File system type that manages the files to be upgraded
It has 5520 information. The backup process 2520
File backup processing based on the information of input
The table A5500 is the input table 253 in the first embodiment.
Used instead of 0. In the second embodiment, the backup
Computer 1030 is connected to the host computer 1020.
Do not ask about file system type, etc.
File system on the host computer 1020
Knowledge process 2030, inquiry packet 4500, notification packet
G5000 is unnecessary. Fig. 12 shows backup processing A8000
The flow of is shown. First in step 8020 the user backs
Host computer to upcomputer 1030
To be backed up on disk 1090 managed by
Instructs to back up file 1550. Concrete
Specifically, a user input command A9520 is input. input
Table A5500 shows the backup target storage name 5020
And set "diskabc" which is the name of disk 1090
Input table A5500 backup target full path
The file name 4010 contains the full
Set "/tmp/test.txt" as the file name of the path
To the file system type 5520 of the input table A5500.
Sets "sfa" which means file system A1040
You. Next, in step 8060, the backup process
2520 is the file system type 552 of the input table A5500.
Look at the value "sfa" of 0 and select file system A1040,
In addition, the input target A5500 backup target storage
Look at the value "diskabc" of the name 5020 and select the disk 1090
You. The backup process 2520 will then
Selected in the access information storage area 2040 of the file system A1040
Is stored in the metadata storage area A1520 on the
File access information A1530
Backup computer 1030 has file system A1
Read and write files on disk 1090 correctly using 040
To be able to In step 8100, the backup
Process 2520 backs up file system A1040
When a read request for the file 1550 to be uploaded is issued,
File system A1040 is backed up on disk 1090.
Backup target file 1550 and backup process
Pass to 2520. Finally, in step 8120, the backup
Backup process 2520 against the file system D1070.
Backup target file 1550 to backup disk 1100
File system D1070.
A backup disk based on the file access information B2540
The backup target file 1550 is stored in the network 1100. Less than
As described above, in the second embodiment, the backup
The computer 1030 manages data managed by the host computer 1020.
Files to be backed up stored on disk 1090
1550 backup files for each computer 10
Backup to 30 managed backup disks 1100
can do. In this embodiment, the backup disk
The example of backing up to 1100 is shown, but backup
Backup by performing the same process on the
It goes without saying that it can be done. (Third embodiment) The third embodiment is the object of backup.
Storage name that stores the file to be
File when the user enters the full pathname of the file.
Thus, points different from the first embodiment will be described. FIG.
User backs up to backup computer 1030.
User input command B954 to input when instructing
Indicates 0. "Backup" is the backup command name
You. "Diskabc" is the file to be backed up
Is the name of the disk 1090 in which is stored. "/Tmp/test.tx
"t" is the backup that is the backup target file
This is the full path name of the target file 1550. Thus, the book
In the embodiment, the backup command is
The full path name of the target file and the string that stores it.
Specify the name of the storage as a parameter. FIG.
Used in place of input table 2530 in the first embodiment
An input table B6000 to be executed is shown. Input table B6000
Backup target storage name 5020 and backup target
It has information of the path file name 4010. Backup pro
Seth 2520 uses this information to back up files.
Perform processing. The input table B6000 is used in the first embodiment.
It is used instead of the input table 2530. Third implementation
In the example, the backup computer 1030 is the host
Query the file system type etc.
The host computer 1020.
File system notification process 2030, inquiry packet
4500 and notification packet 5000 are unnecessary. FIG. 14 shows the present embodiment
The flow of the backup process B8500 corresponding to the example is shown. Ma
In step 8520, the user
The host computer 1020 manages the
Backup file 1550 on disk 1090
Give instructions to back up. Specifically, the user
Enter the input command B9540. And input table B60
Disk as backup target storage name 5020 at 00
Set “diskabc”, which is the name of 1090, and enter the
A5500 backup target full path to file name 4010
Is the file with the full path of the backup target file 1550
Set "/tmp/test.txt" as the name. Next,
On the backup computer 1030
Select one file system. And step 8560
In the access information storage area of the selected file system
2040 is the directory indicated by the backup target storage name 5020.
From disk 1090, disk 1090 was selected in step 8540
If the file system is assumed to be managed,
Reads the area where file access information is stored
You. Actually disk 1090 is file system A1040
Uses other file systems because it is managed
Data read from the area considered to be management information
Doing so will result in random data. And step 8580
The management data expected in the data read in step 8560
Data is determined. This judgment is read
Back specified by the user in step 8520
Information of the upgrade target file 1550 is stored correctly
Whether to do. If correct, step 8620
Proceed to and jump to 8660 if incorrect. Steps
On the 8620, the backup process 2520 has a file system
Read file 1550 to be backed up for program A1040
Issue a read request, and file system A1040
Read the backup target file 1550 on
Handover process 2520. Finally go to step 8640
By the way, backup process 2520 is a file system
Backup target file 1550 to D1070
Up disk 1100
Based on the file access information B2540, the system D1070
Backup target files 15 on the backup disk 1100
Stores 50. As described above, in the third embodiment as well,
Backup computer 1030 is the host computer
Backups stored on disk 1090 managed by 1020
Backup target file 1550 in file units
Backup disk 11 managed by computer 1030
00 can be backed up. In this embodiment, the battery
Backup disk 1100 as an example
However, the same process must be performed on the backup tape 1110.
Needless to say, the backup can be performed by using a backup computer. (Fourth Embodiment)
In the initial state of this embodiment, the
File system only has file system D1070
Are different from the third embodiment. Fourth implementation
In the initial state of the example, the backup computer A7000
Is disk A6 that stores backup target file 1550
Since there is no file system A for managing 500,
Access target file 1550 as a file
Can not be. FIG. 15 shows the host computer 1020.
1 shows a disk A6500 for storing data for use in a computer. Disk A
The 6500 is a port for exchanging data with the SAN1080.
Port C1500 and the SAN port C1500 has a SAN port address.
Resource C1510 is assigned. SAN port address C151
Packets (data) on SAN1080 with 0 as the destination
Transferred to SAN port C1500. On disk A6500,
The file system A1040 that manages this disk A6500
Stored in a fixed area called file system storage area 6510
Have been. Also, on disk A6500, the file
File that is management information such as the directory and directory structure
Metadata storage area A that stores access information A1530
1520 and the file that stores the data that is the substance of the file.
There is a file storage area A1540. File storage area A1540
Stores a backup target file 1550.
Files on disk 1090 use file system A1040
Created by the host computer 1020
Therefore, file system B1050, file system C106
0, file system D1070 cannot access
I do. In this embodiment, the management of the host computer 1020 is performed.
File 1550 to be backed up
A7000 reads it out as a file and
The following describes the steps to be performed. Figure 16 shows the backup
1 shows the configuration of a computer A7000. Backup compilation
A7000 is the port for exchanging data with LAN1010.
LAN port B2500, LAN port B2500 is LAN port
It has address B2510. Assign LAN port address B2510
The packet on LAN1010 that has the destination is sent to LAN port B2500.
Will be transferred. Also, backup computer A7000
Is a SAN port as a port to exchange data with the SAN1080
B2560, and SAN port B2560 has SAN port address B2
570 is assigned. SAN port address B2570
The packet on SAN1080 with the destination is SAN port B2
Transferred to 560. On backup computer A7000
Now, several processes 2020 will be performed according to user instructions.
Backup process to backup data 25
20 are working. Backup process 2520 is user
Input table B600 that stores the parameters entered by the user
Manage 0. Backup computer A7000
The file system D1070 is available. Backup co
Computer A7000 manages and stores backup data.
Backup disk 1100 and backup
Group 1110 is accessed using file system D1070
can do. Access on file system D1070
Storage information management area 2040 on the backup disk 1100
File access information B2540, which is file management information
File management information on the backup tape 1110
File access information C2550 has been read. Ba
The backup computer A7000 uses this file access
On backup disk 1100 based on source information B2540
Files can be accessed, as well as
Backup tape 1110 based on file access information C2550
You can access the files located above.
FIG. 17 shows the flow of the backup process C9000. First
In Tep 9020 users can backup computer
Host computer 1020 manages A7000
Backup file 1550 on disk A6500
Give instructions to back up. Specifically, the user
Enter the input command B9540. And input table B60
Disk as backup target storage name 5020 at 00
Set “diskabc”, which is the name of A6500, and enter
To the backup target full path file name 4010
Is the file with the full path of the backup target file 1550
Set "/tmp/test.txt" as the name. Next,
In step 9040, the backup process 2520
Indicated by the backup target storage 5020 of the cable B6000
Stored in file system storage area 6510 of disk A6500
File system A1040 to disk A6500
Read as a file system to access. So
Then, in step 9060, the backup process 2520
Of the file system A1040 read in step 9040
The metadata of disk A6500 is stored in the access information storage area 2040.
File access information stored in data storage area A1520.
Read A1530 and backup computer A70
00 correctly using file system A1040 on disk A65
Read and write files on 00. Steps
On the 9100, the backup process 2520
Backup target of input table B6000 for program A1040
The backup target file indicated by the full path file name 4010
When a read request for file 1550 is issued, the file system
A1040 is 15 files to be backed up on disk A6500
Read 50 and pass to backup process 2520. last
In step 9120, the backup process 2520
The file to be backed up is
File 1550 to backup disk 1100
File system D1070 requests file access information.
Backup to disk 1100 based on
The file 1550 to be backed up is stored. As described above,
In the fourth embodiment, the backup computer A7000 is
Disk A6500 managed by host computer 1020
Copy the stored backup target file 1550
Management of the backup computer A7000
Backup to backup disk 1100
it can. In this embodiment, the backup disk 1100
Backup tape 1110
Can be backed up by performing the same process
Needless to say

According to the present invention, data on a storage device not directly managed by a computer can be accessed at a file level.

[Brief description of the drawings]

FIG. 1 is a diagram showing a computer system to which the present invention is applied.

FIG. 2 is a diagram showing a disk managed by a host computer.

FIG. 3 illustrates a host computer.

FIG. 4 is a diagram showing a backup computer.

FIG. 5 is a diagram showing a backup disk.

FIG. 6 is a diagram showing a backup tape.

FIG. 7 is a diagram showing an input table for holding user input information.

FIG. 8 is a diagram showing an inquiry packet for inquiring about a file system.

FIG. 9 is a diagram showing a notification packet for notifying a file system.

FIG. 10 is a diagram showing a flow of a backup process.

FIG. 11 is a diagram showing an input table A corresponding to the second embodiment.

FIG. 12 shows a backup process corresponding to the second embodiment.
FIG.

FIG. 13 is a diagram showing an input table B corresponding to the third embodiment.

FIG. 14 shows a backup process corresponding to the third embodiment.
FIG.

FIG. 15 is a view showing a disk A corresponding to the fourth embodiment.

FIG. 16 is a diagram showing a backup computer A corresponding to the fourth embodiment.

FIG. 17 shows a backup process corresponding to the fourth embodiment.
FIG.

FIG. 18 is a diagram showing a command input by a user.

FIG. 19 is a diagram illustrating a command input by the user according to the second embodiment.

FIG. 20 is a diagram illustrating commands input by the user according to the third and fourth embodiments.

[Explanation of symbols]

1000 computer system, 1010 LAN, 1020 host computer, 1030 backup computer, 1040 file system A, 1050 file system B, 1060 file system C, 1070 file system D, 1080 SAN, 1090 disk , 1100 ... backup disk, 1110 ... backup tape.

Continued on the front page (72) Inventor Minoru Kosuge 2880 Kozu, Odawara-shi, Kanagawa F-term in Hitachi, Ltd. Storage Systems Division 5B045 DD10 DD16 EE06 EE11 JJ43 5B065 BA01 CE01 5B082 HA00

Claims (1)

[Claims] 1. A first computer, a storage device for storing files accessed by the first computer, a second computer, the first computer, the storage device, and the second computer. A computer system comprising a network connecting the first computer and the second computer.
A computer system according to claim 1, wherein said computer inquires of said computer about information enabling reading and writing of a file stored in said storage device.