Shulou(Shulou.com)06/03 Report--

[EVA Storage device Information]

1. HP EVA8400 storage: 1 group of expansion cabinets.

2. It consists of 12 2T FATA disks (AG691A 454414-001) and 8 300g 15K FC disks (AG690A 454411-001).

3. The host environment is WINDOWS.

[EVA storage failure analysis]

1. After repeated confirmation with the user, we know that the use of the data has been stopped after a failure. According to the failure of HP-EVA in the past, it may be inferred that the reliability of data recovery is high.

2. The EVA host and expansion cabinet shut down normally, then mark the location serial number of all the hard drives and take them out. The EVA 8400 controller is no longer powered on until the data is successfully restored.

3. After taking over the disk, connect the disk according to the corresponding link.

4. Enter the WINDOWS environment, check the disk situation with WINHEX, and find that all disks can be identified normally.

5. Check the information of each disk and find that there is PV HEAD on 300g FC disk and no PV HEAD on 1T FATA disk. Looking at the Metadata stored on 300G disks, it is found that only one RSS group of LUN is described, which is less than 2T in size and consists of all 300G disks. On the other hand, the residual LUN information in 1T FATA disk includes at least 5 sets of information. The above information indicates that for some reason, all the VDISK partitioned in the DISK GROUP composed of 1T disks were deleted and all 1T FATA disks were UNGROUP.

6. Analyze the Metadata retained on 1T FATA disk.

[EVA storage failure recovery process]

1. Make a complete mirror of all disks.

2. Restore the LUN to which the 300g disk belongs.

3. Because the 1T disk has all UNGROUP, it is impossible to know the allocation of RSS and its own disk ID. Therefore, it is necessary to analyze the RSS configuration table manually. Through the comparison of META information and the verification of xor information area, the following rss group configuration table is obtained:

3-0 hd6

3-1 hd8

3-2 hd2

3-3 hd9

3-4 hd10

3-5 hd5

2-0 hd0

2-1 hd7

2-2 hd1

2-3 hd11

2-4 hd3

2-5 hd4

4. Reorganize and integrate all LUN storage allocation tables.

5. Extract all LUN according to the storage allocation table and the RSS disk allocation table. In the process of extraction, the failed XOR stripes are manually analyzed to determine the offline situation (there is no offline disk in this case), to determine the best reorganization conclusion, and then to restore the data.

[EVA storage failure data recovery conclusion]

After the reorganization, the data can be accessed normally, and the data checked and accepted by the user is correct, so the data recovery work is completed.

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