On 3/16/2018 10:33 AM, Peter Penchev wrote:
Would there be any major opposition to adding a StorPool shared
storage image backend, so that our customers are not limited to
volume-backed instances? Right now, creating a StorPool volume and
snapshot from a Glance image and then booting instances from that
snapshot works great, but in some cases, including some provisioning
and accounting systems on top of OpenStack, it would be preferable to
go the Nova way and let the hypervisor think that it has a local(ish)
image to work with, even though it's on shared storage anyway. This
will go hand-in-hand with our planned Glance image driver, so that
creating a new instance from a Glance image would happen
instantaneously (create a StorPool volume from the StorPool snapshot
corresponding to the Glance image).
Ask the EMC ScaleIO team how well this has gone for them:
https://review.openstack.org/#/c/407440/
There has been a lot of discussion about a generic Cinder image backend
driver in nova so that we don't need to have the same storage backend
driver explosion that Cinder has, and we could also then replace the
nova lvm/rbd image backends and just use Cinder volumes for
volume-backed instances.
I could find lots of discussion references about this, but basically no
one is planning to step up to work on that, and the existing libvirt
imagebackend code is a mess, so piling more backends into the mix isn't
very attractive.
Anyway, just FYI on all of that history.
If this will help the decision, we do have plans for adding a
full-blown Nova third-party CI in the near future, so that both our
volume attachment driver, this driver, and our upcoming Glance image
driver will see some more testing.
3rd party CI would be a requirement to get it added anyway, it's not
really an option.
--
Thanks,
Matt
__________________________________________________________________________
OpenStack Development Mailing List (not for usage questions)
Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
