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Date: Wed, 16 Sep 2009 13:33:40 -0700
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Subject: Re: [linux-lvm] Using LVM Mirroring to obtain a usable backup
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Ambrogio De Lorenzo [ambrogio.de.lorenzo@alice.it] wrote:
> > snapshot may be a good fit in this case, but if you insist you can use
> > lvconvert to convert your linear volume to a mirrored volume. Once the
> > sync is complete, you can use the same lvconvert to convert the mirror
> > volume to a linear one.
> But with this I loose the secondary copy.
> It's not a good idea.
> Backup and destroy backup :-)

If that is on a single PV, you can disconnect it to avoid it being
allocated by LVM for other things. I think, taking a snapshot and coping
it somewhere as someone said is a good idea.