On Mon, Nov 24, 2014 at 9:07 PM, Joe Lawrence [off-list ref] wrote:

Does anyone know how its possible to determine which side of an LVM RAID 1
is the stale partner during RAID resync?

In ordinary MD RAID, I believe you can check
/sys/block/md0/md/dev-XXX/state, but LVM RAID seems to hide those files
when leveraging the MD code.  I've looked though pvs/vgs/lvs manpages, but
can't figure anything out there either.

Rather indirectly: iotop which will show you which devices are mostly
being read from and written to.

# lvs -a -o copy_percent
Anything less than 100% is syncing. I think.

-- 
Chris Murphy