[cinder] lvm_mirrors option seems to be broken

Mark Lehrer lehrer at gmail.com
Tue Jul 30 20:04:32 UTC 2019

Any time!  Thanks for the quick response here and on freenode.

BLZb^H^H^H^H Mark

On Tue, Jul 30, 2019 at 1:31 PM Sean McGinnis <sean.mcginnis at gmx.com> wrote:
> On Tue, Jul 30, 2019 at 10:45:20AM -0600, Mark Lehrer wrote:
> > Final suggestion: on my system, lvm seems to work best with the
> > "--type raid10" option.
> >
> > Perhaps a cinder.conf option for lvm_type=raid10 would be useful?
> > raid1 too?  I am seeing this warning from lvcreate quite a lot, so
> > something needs to change fairly soon:
> >
> > WARNING: Log type "mirrored" is DEPRECATED and will be removed in the
> > future. Use RAID1 LV or disk log instead.
> >
> > Thanks,
> > Mark
> >
> Looks like we have a couple of bugs.
> Mirroring does not appear to be supported with thin provisioned volumes, but
> our code does not currently check if the two are used in combination. At a
> minimum we should recognize that and give a nice informative warning message in
> the log. Since we now default to trying to create a thin pool unless explicitly
> asked for thick provisioning, this could be more of an issue. We should also
> put a warning in the help text for the lvm_mirrors config option.
> The `--mirrorlog mirrored` option is deprecated. Based on your experiments, we
> may want to just change that to `--type raid1`, or maybe better `--type
> raid10`.
> I'm not sure all the permutations of possible configurations here, so it might
> take someone a little time to validate the correct args for each situation. But
> definitely looks like this is an area that needs some attention.
> Thanks for digging in to this and reporting your results.
> Sean

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