and better explained here: http://ceph.com/docs/master/rbd/qemu-rbd/
On Thu, May 28, 2015 at 6:02 AM, David Medberry <openst...@medberry.net> wrote: > The primary difference is the ability for CEPH to make zero byte copies. > When you use qcow2, ceph must actually create a complete copy instead of a > zero byte copy as it cannot do its own copy-on-write tricks with a qcow2 > image. > > So, yes, it will work fine with qcow2 images but it won't be as performant > as it is with RAW. Also, it will actually use more of the native underlying > storage. > > This is also shown as an Important Note in the CEPH docs: > http://ceph.com/docs/master/rbd/rbd-openstack/ > > On Thu, May 28, 2015 at 4:12 AM, Shake Chen <shake.c...@gmail.com> wrote: > >> Hi >> >> Now I try to use Fuel 6.1 deploy openstack Juno, use Ceph as cinder, nova >> and glance backend. >> >> In Fuel document suggest if use ceph, suggest use RAW format image. >> >> but if I upload qcow2 image, seem working well. >> >> what is the different use qcow2 and RAW in Ceph? >> >> >> -- >> Shake Chen >> >> >> _______________________________________________ >> OpenStack-operators mailing list >> OpenStack-operators@lists.openstack.org >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators >> >> >
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