[linux-lvm] Mirroring to a thin volume
zdenek.kabelac at gmail.com
Mon Jul 15 08:33:06 UTC 2013
Dne 15.7.2013 07:46, Raymond Jennings napsal(a):
> Is there a way to hot-convert a live volume to thin provisioning?
> I was thinking of doing this:
> 1. Create a thin volume
> 2. Have it mirror the linear volume
> 3. Break the linear mirror
> 4. Run an fs discard on the thin volume
There is planned feature 'merge' of any LV into thin pool - so you would
be able to turn your LV into thin volume (but likely there will not a be a way
to split such thin-LV back to non-thin LV anytime soon).
In the upstream git there is already support for 'external origin'
where you could use some LV as a source for 'unprovisioned' blocks
which is something like snapshot of LV where modified blocks
are put into thin pool - but this feature has some limitation -
i.e. for now you cannot 'merge' modified blocks back to external origin.
I guess mirror construction currently only supports PVs - so
you would need to use 'stacked' VG - there is planned better support for
stacking of volumes in a VG - but it's not so easy as it might look.
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