-----Original Message-----
From: Neil Brown [mailto:neilb@suse.de]
Sent: Monday, May 31, 2010 12:58 AM
To: Leslie Rhorer
Cc: linux-raid@vger.kernel.org
Subject: Re: Confused about reshape?

On Mon, 31 May 2010 00:32:07 -0500
"Leslie Rhorer" [off-list ref] wrote:

quoted

quoted

Just tell mdadm what you want and it will do it, or report that it

cannot.

quoted

	Um, OK, I tried it, and it failed:

Backup:/# mdadm --grow /dev/md0 --level=6
mdadm: no changes to --grow

cat /proc/mdstat ??
mdadm -D /dev/md0 ??
mdadm -V ??
uname -a ??

Maybe add -vv to the --grow

/dev/md0:
        Version : 1.02
  Creation Time : Sun Jul 12 20:44:02 2009
     Raid Level : raid5
     Array Size : 10255969024 (9780.85 GiB 10502.11 GB)
  Used Dev Size : 1465138432 (1397.26 GiB 1500.30 GB)
   Raid Devices : 8
  Total Devices : 9
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Mon May 31 00:44:25 2010
          State : active
 Active Devices : 8
Working Devices : 9
 Failed Devices : 0
  Spare Devices : 1

         Layout : left-symmetric
     Chunk Size : 256K

           Name : Backup:0  (local to host Backup)
           UUID : 940ae4e4:04057ffc:5e92d2fb:63e3efb7
         Events : 987130

    Number   Major   Minor   RaidDevice State
       0       8        0        0      active sync   /dev/sda
       1       8       16        1      active sync   /dev/sdb
       2       8       32        2      active sync   /dev/sdc
       8       8       48        3      active sync   /dev/sdd
       4       8       64        4      active sync   /dev/sde
       5       8       80        5      active sync   /dev/sdf
       6       8       96        6      active sync   /dev/sdg
       7       8      112        7      active sync   /dev/sdh

       9       8      128        -      spare   /dev/sdi

Backup:/tmp# mdadm -V >> temp
mdadm - v3.0.3 - 22nd October 2009

Backup:/tmp# uname -a
Linux Backup 2.6.32-3-amd64 #1 SMP Wed Feb 24 18:07:42 UTC 2010 x86_64
GNU/Linux

Backup:/tmp# mdadm --grow -vv /dev/md0 --level=6 >> temp
mdadm: no changes to --grow