Hi Dave, Disclaimer: I'm not an OpenStack user. On 04/05/2013 03:43 PM, Dave Spano wrote:
If I pause my instances in Openstack, then snapshot and clone my volumes, I should have a consistent backup correct? Is freezing on snapshot creation like LVM a potential future feature?
No, probably not. Unless you are also saving the memory state of the instance you can't be 100% sure you snapshot is consistent.
Writes can still be buffered inside the VM and those do not end up in your snapshot.
So to get 100% consistent snapshot you will have to flush the buffers, freeze the filesystem, snapshot and unfreeze.
I've considered Sebastien's method here( http://www.sebastien-han.fr/blog/2012/12/10/openstack-perform-consistent-snapshots/ ), but I would prefer to backup via ceph and outside of the vm. Dave Spano Optogenics Systems Administrator _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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