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On 2/12/2013 12:53 PM, Mikael Abrahamsson wrote:

On Tue, 12 Feb 2013, Phillip Susi wrote:

quoted

I just noticed that reducing the used dev size has not moved the 
metadata, so it is looking like it just isn't possible to shrink
the md partition with metadata format 1.0?

From "man mdadm"

"The different sub-versions store the superblock at different
locations on the device, either at the end (for 1.0), at the start
(for 1.1) or 4K from the start (for 1.2)"

I don't really see how it could be shrunk with a superblock at the
end, then you wouldn't be able to find it next time...

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

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

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