On 10/04/2017 02:16 PM, Curt wrote:
Hi,
I was reading this one https://raid.wiki.kernel.org/index.php/RAID_Recovery
I don't have any spare bays on that server...I'd have to make a trip
to my datacenter and bring the drives back to my house. The bad thing
is the 2 drives I replaced, failed a while ago, so they were behind.
I was hoping I could still use the 4 drives I had before I did a grow
on them. Do they need to be up-to-date or do I just need the config
from them to recover the 3 drives that were still good?
Oh, I originally started with 7, 2 failed a few moths back and the 3rd
one just recently. FML
Er ... honestly, I hope you have a backup.
If the drives are really dead, and can't be seen with lsscsi or cat
/proc/scsi/scsi , then your raid is probably gone.
If they can be seen, the ddrescue is your best option right now.
Do not grow the system. Stop that. Do nothing that changes metadata.
You may (remotely possibly) recover if you can copy the "dead" drives to
two new live ones.
Cheers,
Curt
On Wed, Oct 4, 2017 at 1:51 PM, Anthony Youngman
<antlists@xxxxxxxxxxxxxxx> wrote:
On 04/10/17 18:18, Curt wrote:
Is my raid completely fucked or can I still recover some data with
doing the create assume clean?
PLEASE PLEASE PLEASE DON'T !!!!!!
I take it you haven't read the raid wiki?
https://raid.wiki.kernel.org/index.php/Linux_Raid#When_Things_Go_Wrogn
The bad news is your array is well borked. The good news is I don't think
you have - YET - managed to bork it irretrievably. A create will almost
certainly trash it beyond recovery!!!
I think we can stop/revert the grow, and get the array back to a usable
state, where we can force an assemble. If a bit of data gets lost, sorry.
Do you have spare SATA ports? So you have the bad drives you replaced (can
you ddrescue them on to new drives?). What was the original configuration of
the raid - you say you lost three drives, but how many did you have to start
with?
I'll let the experts talk you through the actual recovery, but the steps
need to be to revert the grow, ddrescue the best of your failed drives,
force an assembly, and then replace the other two failed drives. No
guarantees as to how much data will be left at the end, although hopefully
we'll save most of it.
Cheers,
Wol
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