HP EVA8400 in a certain court deleted the VDISK and the data was restored successfully.

Fault description]

An HP EVA8400 storage, two expansion cabinets, physical disks consisting of 12 1 tb fata disks AG691A 454414-001) and 10 300 GB 15 k fc disks AG690A 454411-001) the number of Luns is unknown, and the host environment is WINDOWS, which stores the materials for the Court's historical cases.

The North Asia data recovery center was unable to directly learn the cause of the fault because the case was changed across multiple parties.

Initial check and Analysis]

1. Check the phone number and confirm that the data is not reused after a fault occurs. Usually according to the failure of the HP-EVA, the reliability of data recovery is higher.

2. The EVA host and expansion cabinet are shut down normally, and then all the hard disks are marked with the location serial number and taken out. The EVA 8400 controller is no longer enabled until the data is successfully restored.

3. After taking over the disk, connect the disk as follows.

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4. Go to the WINDOWS environment and use WINHEX to view the disk status. All disks can be recognized normally.

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5. Check the information of each disk. The pv head exists on the 300 gb fc disk, and no pv head exists on the 1 tb fata disk. Check the Metadata stored in a GB disk and find that only the LUN consisting of one RSS group is described. The size is less than 2 TB and the members are all GB disks. The LUN information left on a 1 tb fata disk contains at least five groups of information. The above information indicates that, for some reason, all vdisks in the disk group consisting of 1 TB disks are deleted and all 1 tb fata disks are ungrouped.

6. Analyze the Metadata retained on a 1 tb fata disk to roughly determine a high recovery rate.

Recovery Process]

1. Make a full image of all disks. For details, refer to "How to make a full backup of disks" or other articles in my blog.

2. Use Frombyte recovery for HP-EVA (North Asia data recovery center has released this software) to recover the LUN to which the 300 GB disk belongs.

3. Because 1 TB of disks are all UNGROUP, the distribution of RSS and its own disk ID are unknown. Therefore, you need to manually analyze the RSS configuration table. The following rss group configuration table is obtained through META information comparison and xor information validation:

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 the storage allocation tables of all Luns.

5. All Luns are extracted based on the Storage Allocation Table and the RSS disk allocation table. During the extraction process, the XOR strip that does not pass is manually analyzed to determine the offline Condition (in this example, no offline disk is dropped), the best reorganization conclusion is obtained, and then restored through Frombyte recovery for HP-EVA.

Data Recovery conclusion]

Data 100% is successfully restored, lasting three working days.

This article is from the "Zhang Yu (data recovery)" blog, please be sure to keep this source http://zhangyu.blog.51cto.com/197148/1341371