> Op 10 juni 2016 om 0:04 schreef Brian Kroth <bpkroth@xxxxxxxxx>: > > > I'd considered a similar migration path in the past (slowly rotate > updated osds into the pool and old ones out), but then after watching > some of the bugs and discussions regarding ceph cache tiering and the > like between giant and hammer/jewel, I was starting to lean more towards > the rbd -c oldcluster.conf export | rbd -c newcluster.conf import. That > way would give you time to test out a completely independent setup for a > while, do a rbd version format switch along the way, and whatever else > you needed to do. Could even failback (probably with some data loss) if > necessary. In theory this could also be done with minimal downtime > using the snapshot diff syncing process [1], no? > > Anyways, anyone have any operational experience with the rbd export | > rbd import method between clusters to share? > I did this where I had to merge two Ceph clusters in to one cluster. In that case there were some 25TB RBD images involved. It worked, but the copy just took a long time, that's all. Wido > Thanks, > Brian > > [1] <http://ceph.com/planet/convert-rbd-to-format-v2/> > > Michael Kuriger <mk7193@xxxxxx> 2016-06-09 16:44: > >This is how I did it. I upgraded my old cluster first (live one by one) . Then I added my new OSD servers to my running cluster. Once they were all added I set the weight to 0 on all my original osd's. This causes a lot of IO but all data will be migrated to the new servers. Then you can remove the old OSD servers from the cluster. > > > > > > > > > >Michael Kuriger > >Sr. Unix Systems Engineer > > > >-----Original Message----- > >From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Wido den Hollander > >Sent: Thursday, June 09, 2016 12:47 AM > >To: Marek Dohojda; ceph-users@xxxxxxxxxxxxxx > >Subject: Re: Migrating from one Ceph cluster to another > > > > > >> Op 8 juni 2016 om 22:49 schreef Marek Dohojda <mdohojda@xxxxxxxxxxxxxxxxxxx>: > >> > >> > >> I have a ceph cluster (Hammer) and I just built a new cluster > >> (Infernalis). This cluster contains VM boxes based on KVM. > >> > >> What I would like to do is move all the data from one ceph cluster to > >> another. However the only way I could find from my google searches > >> would be to move each image to local disk, copy this image across to > >> new cluster, and import it. > >> > >> I am hoping that there is a way to just synch the data (and I do > >> realize that KVMs will have to be down for the full migration) from > >> one cluster to another. > >> > > > >You can do this with the rbd command using export and import. > > > >Something like: > > > >$ rbd export image1 -|rbd import image1 - > > > >Where you have both RBD commands connect to a different Ceph cluster. See --help on how to do that. > > > >You can run this in a loop with the output of 'rbd ls'. > > > >But that's about the only way. > > > >Wido > > > >> Thank you > >> _______________________________________________ > >> ceph-users mailing list > >> ceph-users@xxxxxxxxxxxxxx > >> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.ceph.com_lis > >> tinfo.cgi_ceph-2Dusers-2Dceph.com&d=CwICAg&c=lXkdEK1PC7UK9oKA-BBSI8p1A > >> amzLOSncm6Vfn0C_UQ&r=CSYA9OS6Qd7fQySI2LDvlQ&m=lhisR2C1GH95fR5NYNEGWebX > >> LILh56cyhY8u9v56o6M&s=ddR_8bexw5SKK1wD5UNp9Oijw0Z0I9RnhaIJbcfUS-8&e= > >_______________________________________________ > >ceph-users mailing list > >ceph-users@xxxxxxxxxxxxxx > >https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.ceph.com_listinfo.cgi_ceph-2Dusers-2Dceph.com&d=CwICAg&c=lXkdEK1PC7UK9oKA-BBSI8p1AamzLOSncm6Vfn0C_UQ&r=CSYA9OS6Qd7fQySI2LDvlQ&m=lhisR2C1GH95fR5NYNEGWebXLILh56cyhY8u9v56o6M&s=ddR_8bexw5SKK1wD5UNp9Oijw0Z0I9RnhaIJbcfUS-8&e= > >_______________________________________________ > >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
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