Re: array went wonky

[Robin Hill <robin@robinhill.me.uk>]

[-- Attachment #1: Type: text/plain, Size: 2791 bytes --]

On Thu May 02, 2013 at 07:29:38AM -0700, Gimpbully wrote:

> Sorry, I realize I had md127 started.  So I stopped it and did the
> assemble and got the following (the problem is sdf isn't supposed to
> be a spare at all, it's supposed to be a ddrescue'd sdc:
> 
> eduardo ~ # mdadm --stop /dev/md127
> mdadm: stopped /dev/md127
> eduardo ~ # mdadm --assemble --force /dev/md127 /dev/sd{f,g,e,a}1
> mdadm: /dev/md127 assembled from 3 drives and 1 spare - not enough to start the array.
> eduardo ~ #
> 
> 
> eduardo ~ # mdadm --examine /dev/sd{f,g,e,a}1 | egrep 'Event|/dev/sd'
> /dev/sdf1:
>          Events : 25979
> this     5       8       81        5      spare   /dev/sdf1
>    0     0       8       33        0      active sync   /dev/sdc1
>    2     2       8       65        2      active sync   /dev/sde1
>    4     4       8        1        4      active sync   /dev/sda1
>    5     5       8       81        5      spare   /dev/sdf1
> /dev/sdg1:
>          Events : 25979
> this     1       8       17        1      active sync   /dev/sdb1
>    0     0       8       33        0      active sync   /dev/sdc1
>    1     1       8       17        1      active sync   /dev/sdb1
>    2     2       8       65        2      active sync   /dev/sde1
>    4     4       8        1        4      active sync   /dev/sda1
>    5     5       8       81        5      spare   /dev/sdf1
> /dev/sde1:
>          Events : 25979
> this     2       8       65        2      active sync   /dev/sde1
>    0     0       8       33        0      active sync   /dev/sdc1
>    2     2       8       65        2      active sync   /dev/sde1
>    4     4       8        1        4      active sync   /dev/sda1
>    5     5       8       81        5      spare   /dev/sdf1
> /dev/sda1:
>          Events : 25979
> this     4       8        1        4      active sync   /dev/sda1
>    0     0       8       33        0      active sync   /dev/sdc1
>    2     2       8       65        2      active sync   /dev/sde1
>    4     4       8        1        4      active sync   /dev/sda1
>    5     5       8       81        5      spare   /dev/sdf1
> 

Okay, so we have:
  sda - original disk
  sde - original disk
  sdf - supposed to be ddrescue of original sdc
  sdg - ddrescue of original sdb

From the metadata, it would appear that sdf is not in fact a ddrescue of
sdc, so I'd suggest going back and redoing that. Check afterwards that
the metadata reported by "mdadm --examine" on the two disks matches.

Cheers,
    Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <robin@robinhill.me.uk> |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 198 bytes --]