[openstack-dev] [nova] volume affinity filter for nova scheduler
robertc at robertcollins.net
Wed Jul 10 12:34:00 UTC 2013
On 4 July 2013 03:54, Russell Bryant <rbryant at redhat.com> wrote:
> Thanks for starting this thread.
> I was pushing for the weight function. It seems much more appropriate
> for a cloud environment than the filter. It's an optimization that is
> always a good idea, so the weight function that works automatically
> would be good. It's also transparent to users.
> Some things I don't like about the filter:
> - It requires specifying a scheduler hint
> - It's exposing a concept of co-locating volumes and instances on the
> same host to users. This isn't applicable for many volume backends. As
> a result, it's a violation of the principle where users ideally do not
> need to know or care about deployment details.
We'll probably need something like this for Ironic with persistent
volumes on machines - yes its a rare case, but when it matters, it
matters a great deal.
Robert Collins <rbtcollins at hp.com>
HP Cloud Services
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