Re: Need help with my raid5

[Roger Heflin <rogerheflin@gmail.com>]

On Fri, Mar 22, 2013 at 7:53 AM, Mirko <mirko76@arcor.de> wrote:
>> According to the above you removed device 3 not device 7....device 3
>> is missing...device 7 is still there and is a spare.
>
> Thats right.
>
>> Put what you though was 7 back
> This device no longer exists.

What do you mean no longer exists?

If so, then you are likely restoring from backups as device 7 failed
and device 3 was otherwise was removed and is now no longer viable.
You may be able to do add a -f on the mdadm and force it
online...typically it will force a previously declared missing/spare
device to be re-evaluated and reused if it is good enough or failed
for some reasons.

>
>> ...note that properly determining which
>> device is which is pretty difficult unless you have a commercial grade
>> wired enclosure from a tier 1 vendor that is actually labeled and
>> wired correctly (don't always count on that).
>
> I thought, every device has its fixed device number in the raid:
>
> mdadm -E /dev/sd[a-f]1 | grep Role
>    Device Role : Active device 1
>    Device Role : Active device 5
>    Device Role : spare
>    Device Role : Active device 0
>    Device Role : Active device 4
>    Device Role : Active device 2
>
>
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