On Tue, 12 Feb 2013, Phillip Susi wrote:

You move the superblock, then shrink the partition...

As far as I know, mdadm has no code to shrink partitions?

But it looks like mdadm doesn't move the superblock even though it no
longer is using the full partition.

I think that is perfectly reasonable. Otherwise the superblock wouldn't be 
found next time if the partition wasn't resized.

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se