On 08/06/2014 01:41 PM, Jay Pipes wrote: > On 08/06/2014 01:40 AM, Tom Fifield wrote: >> On 06/08/14 13:30, Robert Collins wrote: >>> On 6 August 2014 17:27, Tom Fifield <t...@openstack.org> wrote: >>>> On 06/08/14 13:24, Robert Collins wrote: >>> >>>>> What happened to your DB migrations then? :) >>>> >>>> >>>> Sorry if I misunderstood, I thought we were talking about running VM >>>> downtime here? >>> >>> While DB migrations are running things like the nova metadata service >>> can/will misbehave - and user code within instances will be affected. >>> Thats arguably VM downtime. >>> >>> OTOH you could define it more narrowly as 'VMs are not powered off' or >>> 'VMs are not stalled for more than 2s without a time slice' etc etc - >>> my sense is that most users are going to be particularly concerned >>> about things for which they have to *do something* - e.g. VMs being >>> powered off or rebooted - but having no network for a short period >>> while vifs are replugged and the overlay network re-establishes itself >>> would be much less concerning. >> >> I think you've got it there, Rob - nicely put :) >> >> In many cases the users I've spoken to who are looking for a live path >> out of nova-network on to neutron are actually completely OK with some >> "API service" downtime (metadata service is an API service by their >> definition). A little 'glitch' in the network is also OK for many of >> them. >> >> Contrast that with the original proposal in this thread ("snapshot VMs >> in old nova-network deployment, store in Swift or something, then launch >> VM from a snapshot in new Neutron deployment") - it is completely >> unacceptable and is not considered a migration path for these users. > > Who are these users? Can we speak with them? Would they be interested in > participating in the documentation and migration feature process?
Yes, I'd really like to see some participation in the development of a solution if it's an important requirement. Until then, it feels like a case of an open question of "what do you want". Of course the answer is "a pony". -- Russell Bryant _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev