On 31/07/14 04:50 AM, Felix Frank wrote:
On 07/31/2014 12:49 AM, Digimer wrote:

   However, it lists in the docs that the "FS" needs to support this, and
well, DRBD is not an FS.

Weird.

FWIW, I read that as "do this only if the data on the partition cares
not about absolute positions of its blocks on the device", i.e. relative
addressing in the filesystem.

(So XFS would break if I tried that? Sounds specious. Perhaps the
document refers to moving data while it's mounted?)

Either way, you can likely apply the documentation to the *content* of
the DRBDs, as though that additional block layer weren't present.

A shame that you gain only 300G, otherwise I'd advise to take this
chance to move to LVM ;-)

Regards,
Felix

I use clustered LVM with DRBD as the PVs. When I tried to use LVM under DRBD as well, it got complicated.

To be honest, I've never needed to do this in production, but I wanted to document the process in case it is ever needed.

So I suppose, if no one knows for sure, I can try moving the partition and see what happens. It's a test/dev machine so the data on it is disposable (just clvmd + gfs2 + a pair of test VMs).

Can I assume that you don't think DRBD will care about absolute positions?

--
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person without access to education?
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