Re: RAID5+spare volume gone - mdadm sees RAID1 only?

On 09/22/2013 02:02 PM, P Agenbag wrote:

Hi List

I have a D-Link DNS345 NAS which I configured as RAID5 + spare with 4x
500GB Seagate SATA drives.

I suspect a power surge caused the NAS to suddenly lose the volume.

All 4 drives checked out OK when doing a SMART test on the NAS itself.
I proceeded to build all 4 drives into a CentOS server, but was unable
to mount the RAID5 - error is always "not enough drives".

I followed some advise in archives, and did some mdadm -- examines,
and echo them below - what I don't understand is why the --examine
picks them up as RAID1.

Is there anything I can do to re-build this array?

The "mdadm --examine" info you gave is clearly for the NAS boot
volume--it is only 1/2 GB--and would be expected to be raid1.

Please take a closer look at your partition tables....

Share them here if you can't get further, and include "mdadm --examine"
from all other partitions that have raid superblocks.

Phil