Re: Raid5 says it's rebuilding, but it lies :)

[David Greaves <david@dgreaves.com>]

Neil Brown wrote:
> On Wednesday April 19, k_schricker@gmx.net wrote:
>   
>> I have a raid5 configuration with 4 disks, of which all were active.  My
>> system froze due to a separate issue (firewire), so I had to power cycle. 
>> In the past, I've always been able to recover with fsck on /dev/md0, however
>> this time I was not, and I am unable to re-assemble the array now.
>>
>> I'm really hoping someone can help me with this.  I've been googling and
>> reading the mdadm manpage for 3 days and getting nowhere.
>>
>> After booting, I get 3 active disks and one faulty.  Theoretically with
>> raid5 I should be able to recover from this, right? :)  When I add it back
>> to the array, it changes to "spare rebuilding".  However it lies: no Rebuild
>> Status ever shows up (and I let it run overnight).
>>     
>
> Hmmm... there is certainly room for removing confusion from that
> "mdadm -D" is reporting.  However what you want to do it:
>
>  mdadm -S /dev/md0
>  mdadm -A /dev/md0 --force /dev/sd[abd]
>  mdadm /dev/md0 --add /dev/sdv
>   
Typo: this last line should be:

mdadm /dev/md0 --add /dev/sdc
                            ^

David