Martin,

On Sat, Sep 14, 2013 at 4:33 PM, Francis Moreau [off-list ref] wrote:

On Sat, Sep 14, 2013 at 12:38 PM, NeilBrown [off-list ref] wrote:

quoted

On Sat, 14 Sep 2013 00:35:47 +0200 Francis Moreau [off-list ref]
wrote:

[...]

quoted

BTW I think I've fixed the issue with mdadm -R /dev/md125 for DDF.
Try the latest git.

It seems it fixes the issue: mdmon is now correctly started with a
degraded DDF array.

However, after using the system with only one disk (sda), sdb is now
outdated. I rebooted the system with 2 disks but mdadm doesn't seem to
notice that sdb is outdated:

# mdadm -I /dev/sda
mdadm: container /dev/md/ddf0 now has 1 device
mdadm: /dev/md/array1_0 assembled with 1 device but not started
# mdadm -I /dev/sdb
mdadm: container /dev/md/ddf0 now has 2 devices
mdadm: Started /dev/md/array1_0 with 2 devices (1 new)
# cat /proc/mdstat
Personalities : [raid1]
md126 : active (auto-read-only) raid1 sdb[1] sda[0]
      2064384 blocks super external:/md127/0 [2/2] [UU]

md127 : inactive sdb[1](S) sda[0](S)
      65536 blocks super external:ddf

So this time mdadm fails to kick out non fresh disk (when using '-I')
but with DDF.

Maybe you have an idea on why mdadm doesn't notice that sdb is
outdated in that case (DDF) ?

Thanks
-- 
Francis