[openstack-dev] [Nova][Cinder] Questions re progress

Duncan Thomas duncan.thomas at gmail.com
Wed Mar 18 17:59:34 UTC 2015

I'm not sure of any particular benefit to trying to run cinder volumes over
swift, and I'm a little confused by the aim - you'd do better to use
something closer to purpose designed for the job if you want software fault
tolerant block storage - ceph and drdb are the two open-source options I
know of.

On 18 March 2015 at 19:40, Adam Lawson <alawson at aqorn.com> wrote:

> Hi everyone,
> Got some questions for whether certain use cases have been addressed and
> if so, where things are at. A few things I find particularly interesting:
>    - Automatic Nova evacuation for VM's using shared storage
>    - Using Swift as a back-end for Cinder
> I know we discussed Nova evacuate last year with some dialog leading into
> the Paris Operator Summit and there were valid unknowns around what would
> be required to constitute a host being "down", by what logic that would be
> calculated and what would be required to initiate the move and which
> project should own the code to make it happen. Just wondering where we are
> with that.
> On a separate note, Ceph has the ability to act as a back-end for Cinder,
> Swift does not. Perhaps there are performance trade-offs to consider but
> I'm a big fan of service plane abstraction and what I'm not a fan of is
> tying data to physical hardware. The fact this continues to be the case
> with Cinder troubles me.
> So a question; are these being addressed somewhere in some context? I
> admittedly don't want to distract momentum on the Nova/Cinder teams, but I
> am curious if these exist (or conflict) with our current infrastructure
> blueprints?
> Mahalo,
> Adam
> *Adam Lawson*
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Duncan Thomas
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