[ceph-users] features required for live migration

Oscar Segarra oscar.segarra at gmail.com
Tue Nov 14 07:25:29 PST 2017


In my environment, I have a Centos7 updated todate.... therefore, all
features might work as expected to do...

Regarding the other question, do you suggest making the virtual disk
"shareable" in rbd?

Thanks a lot

2017-11-14 15:58 GMT+01:00 Jason Dillaman <jdillama at redhat.com>:

> Concur -- there aren't any RBD image features that should prevent live
> migration when using a compatible version of librbd. If, however, you
> had two hosts where librbd versions were out-of-sync and they didn't
> support the same features, you could hit an issue if a VM with fancy
> new features was live migrated to a host where those features aren't
> supported since the destination host wouldn't be able to open the
> image.
>
> On Tue, Nov 14, 2017 at 7:55 AM, Cassiano Pilipavicius
> <cassiano at tips.com.br> wrote:
> > Hi Oscar, exclusive-locking should not interfere with live-migration. I
> have
> > a small virtualization cluster backed by ceph/rbd and I can migrate all
> the
> > VMs which RBD image have exclusive-lock enabled without any issue.
> >
> >
> >
> > Em 11/14/2017 9:47 AM, Oscar Segarra escreveu:
> >
> > Hi Konstantin,
> >
> > Thanks a lot for your advice...
> >
> > I'm specially interested in feature "Exclusive locking". Enabling this
> > feature can affect live/offline migration? In this scenario
> (online/offline
> > migration)  I don't know if two hosts (source and destination) need
> access
> > to the same rbd image at the same time
> >
> > It looks that enabling Exlucisve locking you can enable some other
> > interessant features like "Object map" and/or "Fast diff" for backups.
> >
> > Thanks a lot!
> >
> > 2017-11-14 12:26 GMT+01:00 Konstantin Shalygin <k0ste at k0ste.ru>:
> >>
> >> On 11/14/2017 06:19 PM, Oscar Segarra wrote:
> >>
> >> What I'm trying to do is reading documentation in order to understand
> how
> >> features work and what are they for.
> >>
> >> http://tracker.ceph.com/issues/15000
> >>
> >>
> >> I would also be happy to read what features have negative sides.
> >>
> >>
> >> The problem is that documentation is not detailed enough.
> >>
> >> The proof-test method you suggest I think is not a good procedure
> because
> >> I want to a void a corrpution in the future due to a bad configuration
> >>
> >>
> >> So my recommendation: if you can wait - may be from some side you
> receive
> >> a new information about features. Otherwise - you can set minimal
> features
> >> (like '3') - this is enough for virtualization (snapshots, clones).
> >>
> >> And start your project.
> >>
> >> --
> >> Best regards,
> >> Konstantin Shalygin
> >
> >
> >
> >
> > _______________________________________________
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> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> >
> >
> >
> > _______________________________________________
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> > ceph-users at lists.ceph.com
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> >
>
>
>
> --
> Jason
>
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