Re: array went wonky

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
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