Open Stack

> -----Original Message-----
> From: Daniel P. Berrange [mailto:berrange at redhat.com]
> Sent: 07 October 2015 13:25
> To: Tim Bell <Tim.Bell at cern.ch>
> Cc: Sean Dague <sean at dague.net>; OpenStack Development Mailing List
> (not for usage questions) <openstack-dev at lists.openstack.org>; openstack-
> operators at lists.openstack.org
> Subject: Re: [Openstack-operators] [openstack-dev] [nova] Min libvirt for
> Mitaka is 0.10.2 and suggest Nxxx uses 1.1.1
>
> On Wed, Oct 07, 2015 at 11:13:12AM +0000, Tim Bell wrote:
> >
> > Although Red Hat is no longer supporting RHEL 6 after Icehouse, a
> > number of users such as GoDaddy and CERN are using Software
> > Collections to run the Python 2.7 code.
>
> Do you have any educated guess as to when you might switch to deploying
> new OpenStack version exclusively on RHEL 7 ? I understand such a switch is
> likely to take a while so you can test its performance and reliability and 
> so on,
> but I'm assuming you'll eventually switch ?
>

I think we'll be all 7 by spring next year (i.e. when we install Liberty). The 
software collections work is not for the faint hearted and 7 brings lots of 
good things with it for operations so we want to get there as soon as 
possible. Thus, I think we'd be fine with a change in Mitaka (especially given 
the points you mention below).

> > However, since this modification would only take place when Mitaka
> > gets released, this would realistically give those sites a year to
> > complete migration to RHEL/CentOS 7 assuming they are running from one
> > of the community editions.
> >
> > What does the 1.1.1 version bring that is the motivation for raising
> > the limit ?
>
> If we require 1.1.1 we could have unconditional support for
>
>  - Hot-unplug of PCI devices (needs 1.1.1)
>  - Live snapshots (needs 1.0.0)
>  - Live volume snapshotting (needs 1.1.1)
>  - Disk sector discard support (needs 1.0.6)
>  - Hyper-V clock tunables (needs 1.0.0 & 1.1.0)
>
> If you lack those versions, in case of hotunplug, and live volume snapshots
> we just refuse the corresponding API call. With live snapshots we fallback 
> to
> non-live snapshots. For disk discard and hyperv clock we just run with
> degraded functionality. The lack of hyperv clock tunables means Windows
> guests will have unreliable time keeping and are likely to suffer random
> BSOD, which I think is a particularly important issue.
>
> And of course we remove a bunch of conditional logic from Nova which
> simplifies the code paths and removes code paths which rarely get testing
> coverage.
>
> Regards,
> Daniel
> --
> |: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ 
> :|
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> :|
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