On Mon, 24 Nov 2014 23:07:32 -0500 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,

Why do you believe that?

During a resync (after an unclean shutdown) the devices are indistinguishable.
RAID1 reads all drives and if there is a difference it chooses one data block
to write to the others - always the one with the lowest index number.

So with md or LVM it is the same: first "first" is "copied" to the "second".

NeilBrown

                                 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.

Thanks,

-- Joe
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