On 04/22/2015 12:07 PM, Florian Haas wrote: > Hi everyone, > > I don't think this has been posted to this list before, so just > writing it up so it ends up in the archives. > > tl;dr: Using RBD storage pools with libvirt is currently broken on > Ubuntu trusty (LTS), and any other platform using libvirt 1.2.2. > > In libvirt 1.2.2, the rbd_create3 function is invoked, on volume > creation from a pool, with the stripe_count and stripe_unit parameters > reversed. So if you have an rbd storage pool, and you do "virsh > vol-create-as" or something equivalent, then instead of a stripe count > of one and a stripe size of 4MB, you get 4194304 1-byte stripes. > Needless to say, this renders the volume excruciatingly slow to the > point of not being usable. Volume deletion also takes on the order of > minutes even for an empty volume. > > This issue was introduced in libvirt 1.2.1, and was fixed for 1.2.4, > but Ubuntu 14.04 LTS (which is on 1.2.2) evidently never backported > that fix. > Oops... Did I do this? I think so. I messed up with the arguments. My apologies! Wido > So if you are on libvirt 1.2.2, libvirt rbd storage pools won't work > for you unless you manually apply this patch: > http://libvirt.org/git/?p=libvirt.git;a=commit;h=4cd508ba4fc3cc33c72629fe8b9012e73d8dd8bf > > Further information: > Original Red Hat BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1092208 > Bug I just added to Launchpad so the Ubuntu folks (hopefully) backport > the patch for trusty-updates: > https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1447030 > > Hope this is useful. Thanks to Steven McDonald from Anchor for > spotting the original issue. > > Cheers, > Florian > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Wido den Hollander 42on B.V. Ceph trainer and consultant Phone: +31 (0)20 700 9902 Skype: contact42on _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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