On Tue, Nov 14, 2017 at 10:25 AM, Oscar Segarra <oscar.segarra@xxxxxxxxx> wrote: > 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? Assuming you are refering to the "--image-shared" option when creating an image, the answer is no. That is just a short-cut to disable all features that depend on the exclusive lock. The big use-case for sharing a block device is if you set up a clustered file system on top of it, and I'd argue that you'd probably be better off using CephFS. > Thanks a lot > > 2017-11-14 15:58 GMT+01:00 Jason Dillaman <jdillama@xxxxxxxxxx>: >> >> 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 > > -- Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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