On Fri, Mar 22, 2013 at 7:53 AM, Mirko [off-list ref] wrote:

quoted

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.

quoted

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.

quoted

...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


--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html