Apologies about missing this question earlier, here's a thread on openstack-operators where this was covered: http://lists.openstack.org/pipermail/openstack-operators/2015-May/007142.html
On Wed, May 13, 2015 at 2:24 PM Forrest Flagg <fostro.fl...@gmail.com> wrote: > Hi, > > Looking at the documentation for Fuel 6.0 [1] and it's stated that when > using Ceph one should disable qcow2 so that images are stored in raw > format. This is due to the fact that Ceph includes its own mechanisms for > copy-on-write and snapshots. According to [2] this is true only when using > a BTRFS file system, but in Fuel 6.0 Ceph uses XFS which doesn't provide > this functionality. Also, [2] recommends not using BTRFS for production as > it isn't considered fully mature. In addition, Fuel 6.0 [3] states that > OpenStack with raw images doesn't support snapshotting. > > Given this, why does Fuel suggest not using qcow2 with Ceph? How can Ceph > be useful if snapshotting isn't an option with raw images and qcow2 isn't > recommended? Are there other factors to take into consideration that I'm > missing? > > [1] > https://docs.mirantis.com/openstack/fuel/fuel-6.0/terminology.html#qcow2 > [2] > http://ceph.com/docs/master/rados/configuration/filesystem-recommendations/ > [3] > https://docs.mirantis.com/openstack/fuel/fuel-6.0/user-guide.html#qcow-format-ug > > Forrest > > _______________________________________________ > Mailing list: > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : openstack@lists.openstack.org > Unsubscribe : > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >
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