[Openstack] R: Re: Root disks with Ceph

Remo Mattei remo at mattei.org
Wed Sep 11 22:30:18 UTC 2013

Hi everyone so there is a question to check since I have not done much with ceph if you have an option to delete it on the UK what will be the command cli equivalent be?


-------- Messaggio originale --------
Da: Greg Chavez <greg.chavez at gmail.com> 
Data: 09/11/2013  14:39  (GMT-05:00) 
A: Mike Dawson <mike.dawson at cloudapt.com> 
Cc: openstack at lists.openstack.org 
Oggetto: Re: [Openstack] Root disks with Ceph 
John: I'm talking about primary root disk storage.  Secondary storage would persist of course.

Mike: Right, I just want to establish that if I set the default Cinder plugin to RBD volumes, and I do nothing else, root volumes are ephemeral.  That seems to be the case anyway.

Seems like some of these parameters become meaningless depending on your backing store.  As another example, do you really need to specify a root disk parameter if you're booting from a volume?  I would think not.

Thanks for your responses.

On Wed, Sep 11, 2013 at 1:29 PM, Mike Dawson <mike.dawson at cloudapt.com> wrote:
When you create an instance backed by an RBD Cinder volume, you can specify which behavior you want. There is a check box in Horizon to toggle the behavior.

Mike Dawson

On 9/11/2013 1:15 PM, Greg Chavez wrote:
So if I use RBD as my storage backend for Cinder, what happens to the
root disks of VMs that I terminate?

Do they still exist as RBD volumes in Ceph or are they

If the answer is that they get deleted, or at the very least OpenStack
no longer keeps track of them, then there isn't much difference between
the root and ephemeral disks in the flavors I am using. other than their
being distinct disk devices.  Or so it seems to me.

--Greg Chavez
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