In order to recover RAID 5 first you need to determine RAID 5 configuration parameters and then recover data.
RAID 5 array configuration consists of:
- how many disks were in the RAID 5
- what was the disk sequence
- what block size was used in the array
- at what offset the array data began
- what the parity pattern was used in the RAID5
- in you deal with RAID 5 with delayed parity you need to know the parity delay pattern as well
- in case of RAID5E and RAID5 EE you need to know how spare blocks are located on the array
All these parameters can be determined both manually and automatically. However, if you decide to recover the RAID 5 configuration manually you should be aware that this will be a very long and tedious process which requires special techincal skills.
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