On Wed, Jan 30, 2008 at 01:52:49PM +0100, Pol Hallen wrote:
> I've 8 sata disk on raid 6 software (debian stable).
>
> For purpose test I stopped 3 disks of the array.
^^^^
NOTE WELL: The md(4) man pages says that raid6 can handle the failure of
any 2 disks. You pulled 3. Good way to hose the array.
>
> Now I rebooted and I tring to re-assemble the array but without successful..
>
> mdadm -A /dev/md0
> mdadm: /dev/md0 assembled from 5 drives and 3 spares - not enough to
> start the array.
>
> cat /proc/mdstat
>
> Personalities :
> md0 : inactive sdb[0](S) sdi[10](S) sdk[9](S) sdj[8](S) sdf[4](S)
> sde[3](S) sdd[2](S) sdc[1](S)
> 3907091968 blocks
>
> unused devices: <none>
>
> Consider the data there are on the raid, and there aren't any disks
> failure, is there a way to re-assemble the same raid and maintan the data?
Considering that this is a test, there should be no concern over data.
You did a backup prior to this test?
You hosed the RAID6 array by pulling 3 disks. The spares only help if a
spare disk can get syncd before a third disk died.
So, no, you have to make a new raid and restore from backup.
Doug.
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