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From Wido den Hollander <>
Subject Re: First review of RBD support for primary storage
Date Mon, 02 Jul 2012 12:59:04 GMT

On 29-06-12 17:59, Wido den Hollander wrote:
> Now, the RBD support for primary storage knows limitations:
> - It only works with KVM
> - You are NOT able to snapshot RBD volumes. This is due to CloudStack
> wanting to backup snapshots to the secondary storage and uses 'qemu-img
> convert' for this. That doesn't work with RBD, but it's also very
> inefficient.
> RBD supports native snapshots inside the Ceph cluster. RBD disks also
> have the potential to reach very large sizes. Disks of 1TB won't be the
> exception. It would stress your network heavily. I'm thinking about
> implementing "internal snapshots", but that is step #2. For now no
> snapshots.
> - You are able create a template from a RBD volume, but creating a new
> instance with RBD storage from a template is still a hit-and-miss.
> Working on that one.

I just pushed a fix for creating instances from a template. That should 
work now!


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