Open Stack

Greg,

I believe what you're referring to is talked about on this blog entry:
http://www.sebastien-han.fr/blog/2013/06/24/what-i-think-about-cephfs-in-openstack/

With a corresponding blueprint/code fix for havana?
https://blueprints.launchpad.net/nova/+spec/bring-rbd-support-libvirt-images-type

Looked all this up a month or so ago... as I would personally also like to
use Ceph for both ephemeral, cinder and Object storage.

- Mitch


On Wed, Sep 11, 2013 at 12:39 PM, Greg Chavez <greg.chavez at gmail.com> wrote:

> 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.
>>
>> Thanks,
>> 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
>>> 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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