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Date: Sun, 24 Jan 2010 09:29:19 +0100
From: "Dirk H. Schulz" <dirk.schulz@kinzesberg.de>
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Subject: [linux-lvm] Federicos patch for clustered snapshots
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Hi all,

I am new to the list, so please bear with me.

This is from this list some 15 months ago:

> On Tue, Oct 14, 2008 at 10:12 AM, Federico Simoncelli
> <federico.simoncelli@???> wrote:
> > Looking at the LVM2 code (LVM2.2.02.40, tools/lvcreate.c:640):
> >
> > /* FIXME Allow exclusive activation. */
> > if (vg_is_clustered(vg)) {
> > log_error("Clustered snapshots are not yet supported.");
> > return 0;
> > }
> >
> > looks like there is no way to activate a snapshot in a clustered
> > volume group. Is the documentation wrong?
> > Is there anyone actively working on the "exclusive activation" FIXME
> > that is mentioned in the comment?
>
> Hi all,
> I worked a little on this issue and I came up with a working patch
> for LVM2.2.02.32.
> ...
> To be able to set the lv as exclusive you have to deactivate it on the
> other nodes with the command:
>
> # lvchange -aln /dev/vg00/lvol1
>
> and then you can create the snapshot:
>
> # lvcreate --size 100M --snapshot --name snap /dev/vg00/lvol1
> Logical volume "snap" created
>
> It automatically takes care to set the lv device as exclusive 
> (vgchange -aey).
> Can anyone review the patch? 
I would be very interested in the outcome of this patch. Has it been 
reviewed, how was the result, are there binaries/source code I could deploy?

Any hint or help would be greatly appreciated.

Dirk