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@xxxxxxxxxxx> 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@xxxxxxxx>: >> >> 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 > > > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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