Is there a way to upgrade an existing raid array using metadata format
0.9 to a 1.x format without loosing data?
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On Thu, 26 May 2011 15:23:23 -0400 Phillip Susi <psusi [at] cfl.rr.com> wrote:

> Is there a way to upgrade an existing raid array using metadata format
> 0.9 to a 1.x format without loosing data?

Not really. It is on my list of nice-to-have features for mdadm, but it is
not near the top.

As 1.x uses less space for metadata you could simply recreate the array as
--metadata=1.0
All the data would still be there.
You should be as explicit as possible in the --create command.

mdadm --create /dev/md0 --level=XX --raid-disks=YY --chunk=ZZ --size=QQ
--layout=LL --assume-clean --metadata=1.0

You can only convert to 1.0 metadata as 1.1 and 1.2 put the metadata on top
of where data currently is.


NeilBrown

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