[Openstack] Root disks with Ceph

John Griffith john.griffith at solidfire.com
Wed Sep 11 17:23:15 UTC 2013

On Wed, Sep 11, 2013 at 11:15 AM, Greg Chavez <greg.chavez at gmail.com> 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
> deleted/marked-as-free?
> 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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> Depends on what you're doing here.  Attaching Cinder volumes as
secondary/persistent storage has nothing to do with your root/ephemeral
disks.  If you're doing boot from volume then the Cinder volume is your
root disk.

In other words, in the first case when you terminate the instance yes, the
root disks go away (ephemeral).  Is that what you're getting at?
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