RAID Recovery Process
Though raid disk arrays offer more redundancy, capacity and performance over standard disk systems, once failed, they are often complex and more difficult to recover.
Normally, we only require the hard disks making up the raid volume in order to recover the lost data.
- The process begins by looking at the kinds of failure occurred in a RAID volume. If the RAID server failure is due to multiple failed disks, effort will be spent in getting the failed disks backed to ready state (see Hard Disk Data Recovery.)
- The disk image or the low level binary contents of each disk are then copied out. Next, analysis is performed on the disk images.
- A process of de-stripping will be carried out on each of the extracted disk image upon confirming the RAID types, correct orientation of disk elements forming the RAID volume, the raid strip block size, the associated parity location etc. Different manufacturers may have slightly different RAID settings so additional fine tunings may be needed. Very often, file system repair must also be performed before the data location could be mapped out correctly.
- Once the data layout pattern making the RAID logical volume has been identified and confirmed, the critical data will then be uplifted into other disk media. The data integrity is then evaluated to ensure that the data is of acceptable quality before a file list is finally produced for customer review.
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