Open Stack

On Thu, Mar 14, 2013 at 8:13 PM, Michael Still <mikal at stillhq.com> wrote:

> On Thu, Mar 14, 2013 at 8:50 PM, Blair Bethwaite
> <blair.bethwaite at gmail.com> wrote:
>
> > I think Joe has hit on the crux of this here. There are so many
> permutations
> > of possible deployments that it just isn't reasonable to test everything,
> > let alone even think of all the possibilities, e.g., to continue with the
> > current example, what happens if I have several different pools of shared
> > storage servicing distinct sets of compute nodes under the same Nova
> > deployment...? So it seems reasonable when looking at issues like this
> that
> > they should be viewed through the prism of a novice OS operator
> (experienced
> > sysadmin but little domain knowledge).
> >
> > For this particular problem I don't think either the on or off default is
> > satisfactory. Nova needs to know whether it's dealing with shared
> storage or
> > not. Where it is, the default should be off, where it's not, on.
>
> Grizzly attempts to handle this very situation -- it tries to learn
> the topology of your storage and do sensible things. Unfortunately Joe
> was aware of a bug but didn't report it, and now we don't have time to
> fix it for grizzly RC1, which is a shame. Perhaps we'll get it fixed
> for RC2, although it still seems that a bug hasn't been filed.
>

Filed: https://bugs.launchpad.net/nova/+bug/1155391


>
> I'd expect to see this feature on by default in grizzly. Its been off
> for two releases, which should be ample time for operators to have run
> it in their labs. Its now time to deploy it for real. Its important
> that we enable it because nova is too hard to configure correctly, and
> we need to reduce the number of "make it work" flags that operators
> need to add to deployments. Ultimately nova is in the business of
> managing resources on compute nodes -- its creating and destroying
> VMs, disk volumes, iscsi endpoints and so forth. Cached disk images
> are no different.
>
> I think my overall learning from this thread is that there's no point
> disabling features for a few releases so that operators can test in a
> staged manner -- the reality is that testing doesn't occur.


> Michael
>



-- 
Joe Topjian
Systems Administrator
Cybera Inc.

www.cybera.ca

Cybera is a not-for-profit organization that works to spur and support
innovation, for the economic benefit of Alberta, through the use
of cyberinfrastructure.
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