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Forum Discussion
Re-adding disk to volume
I seem to have gotten myself in some trouble... I've got a RN104 with 4x3TB disks in it. It's running RAID-5 and encryption. v6.6.0. I got emails saying disk #4 was getting errors and that I ...
ckabo wrote:
...Disk #1 seems to be completely broken, but as #4 hadn't died yet I'm currently running ddrescue on disk #4, copying it to the new disk I bought. My reasoning is that as disk #2 and disk #3 are both fine, if I can get a good copy of #4 I should have 3 good disks and be able to have a degraded volume. From there I can add a new disk in slot #1, have the volume resync and be back in business.
...Should this approach work? While the volume was resyncing I may have added 1 or 2 small files, and I'm guessing a couple of files may have been modified as well. So disk #4 is probably a little behind #2 and #3. Will that be OK? mdadm indicates that if the event count is fairly close one can --re-add devices that were previously removed from the array ,,,.
It's probably your only option short of data recovery. The changes might be a problem - not so much the files themselves, but the metadata will be inconsistent. You might want to mount the volume read-only and copy off all the data you can. Leaving slot 1 empty makes sense to me, since you certainly wouldn't want the system to attempt another resync.
ckabo wrote:
... but I don't know if mdadm is used in ReadyNAS.
It is.
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