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Forum Discussion
Help with data recovery after crash
Help/advice needed:
I have a 4 disks ReadyNAS314, configured in Raid5. This weekend my disk 2 (=parity disks) suddenly stopped worked. Normally no problem because a Raid5 can survive that. However, before the new disk I ordered could arrive also disk 1 stopped working. So now I have a dead system and my readynas no longer sees the volume.
Is their a way to still rebuild the volume with 2 new disks and save some of the data on disks 3 and 4 that are still working?
4 Replies
One option is to try to clone the disk 1 to one of replacements. You'd use a cloning tool that does sector-by-sector copying to do that. Clonezilla is one possibility.
Then power down the NAS, insert the clone, and power up the system.
Cloning disk 2 might also be possible, but it's likely out of sync with the array.
Disk 2 is not a "parity disk". The parity and all of the data is spread across all drives, so you cannot recover anything from a subset of less than 3 of 4. Hopefully, the second failed drive is healthy enough to the cloning procedure, so you'll have three drives to work with.
Thanks for the advice. I'm cloning the faulty disks now.
Would you advice to swap out the 2 faulty disk together and put in the cloned ones, or only do one and let the array try a rebuild before replacing the second problem disk?
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