On 21/09/16 11:39, Simon Becks wrote:
Dear Developers & Gurus & Gods,
i had a 3 disk software raid 5 (mdadm) on a buffalo terrastation. By
accident I reset the raid and the NAS put on a xfs filesystem on each
of the 3 partitions.
sda6 sdb6 and sdc6 have been the raid5 member partitions.
Now sda6 sdb6 and sdc6 only contain a xfs filesystem with some empty
default folder structure - my NAS created during the "reset".
This is clearly not ideal, but hopefully you can recreate the MD
superblocks and re-assemble the RAID as it was before, but that will
imply you knowing exactly what order the devices were in your array and
what RAID level and chunksize you used. There are procedures online to
attempt this somewhat safe (by telling MD to assemble read only) but
really the first step in this case is usually to backup the raw
partitions to files or new devices in case you mess up something during
recovery.
Am I screwed or is there a chance to recreate the raid with the 3
disks end up with the raid and the filesystem i had before?
Even if you manage to recreate the RAID superblocks and re-assemble as
it used to be, part of the on RAID data will have been overwritten by
the format of the individual partitions. Maybe enough that your
filesystem will be corrupted beyond repair (at which point you can use
utilities like the excellent "testdisk").
any help is greatly appreciated.
Good luck!
Simon
Regards,
Ben.
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