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

Raid6 disk array can be regarded as the upgraded version of raid5 array, which adds a kind of parity on the basis of raid5 parity. In terms of space utilization, raid5 disk array is the space utilization of NMel 1, and raid6 array is the space utilization of NMel 2. The editor often records cases of recovering raid5 disk arrays, and today introduces a data recovery case of raid6 arrays.

The hardware equipment of this data recovery is a web server of a certain company, raid6 disk array, which has a total of 6 hard drives. Now, 3 hard drives are offline, the server crashes, the MySQL database on the server is lost, and the business is stagnant. Customers want to contact the data recovery company in Beijing for data recovery, so they contact the data recovery center for data recovery.

Although we receive more raid5 disk array data recovery cases than raid6 array, raid6 array and raid5 data recovery process is the same, data recovery engineers first remove all the customer's hard drives from the server in sequence, then mirror each hard disk into a dedicated secure storage pool for data recovery, and then restore the original hard disk to the server and return it to the customer, mirroring the data for later analysis and data recovery.

At the beginning, we also briefly introduced that the raid6 disk array is double parity. The first check is the same as the raid5 array and is checked by ordinary xor operations, but the second check is a relatively complex form of check generated by the reed-solomon algorithm. The server data recovery engineer tested the customer equipment and found that two of the three offline hard drives were offline earlier, and the data on the disk was no longer meaningful for data recovery. therefore, we can only use the second check mode to analyze and extract data from the last offline hard disk. However, at present, the second verification method of raid6 array is not widely used in the data recovery industry, and there is no existing mature data recovery scheme. If you want to recover the disk array of this server, you need the data recovery engineer to customize the raid6 data recovery scheme according to the actual situation of the customer's server.

The server data recovery engineers first simply analyze some original parameters of the raid disk array, then adjust the commonly used data recovery program to adapt to the actual situation of the customer's raid6 disk array, and then use the data recovery program to extract the array data to generate an image file. Theoretically, the recovered image file can carry out the self-test of the data recovery results, and after passing the self-test, you can contact the customer to verify the data recovery results.

After the self-test of the recovered data by the data recovery engineer is normal, the customer verifies it personally, and after customer verification, all the data has been restored, and the raid6 disk array data has been restored successfully.

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