[dm-devel] Re: dm snapshot: allow live exception store handover between tables
Alasdair G Kergon
agk at redhat.com
Fri Nov 6 19:41:36 UTC 2009
On Fri, Nov 06, 2009 at 02:26:21PM -0500, Mike Snitzer wrote:
> OK, actually in practice 'lvchange --refresh' is:
> old->suspend
> new->ctr
Those two need to be swapped.
(I think it's a pre-existing userspace bug that's simple to fix.)
> old->resume
> - device-mapper: snapshots: Unable to handover exceptions to another snapshot on resume.
> new->resume
> - snapshot_resume: handing over exceptions
Handover to new device and make it live first, then remove old device.
It doesn't make sense to me to remove the old device before the new one has
successfully taken over from it.
Alasdair
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