[placement][nova][ptg] Summary: Shared resource providers for shared disk on compute hosts

Chris Dent cdent+os at anticdent.org
Fri May 3 20:08:00 UTC 2019

See also: https://etherpad.openstack.org/p/ptg-train-xproj-nova-placement

There's a spec in progress about turning on support for shared disk
providers [1]. We discussed some of the details that need to be
resolved and actions that need to be taken.

The next action is for Tushar to update the spec to reflect the
decisions and alternatives:

* For some virt drivers, we need example one or two tools for:
     * creating a shared disk provider, setting inventory, creating
       aggregate, adding compute nodes to the aggregate
     * updating inventory when the (absolute) size of the storage
   These were initially discussed as example tools that live in the
   placement repo but it might actually be better in nova. There's an
   abandoned example [2] from long ago.

* Other virt drivers (and potentially Ceph w/libvirt if a reliable
   source of identifier is available) will be able to manage this
   sort of thing themselves in update_provider_tree.

* Other options (for managing the initial management of the shared
   disk provider) include:
     * write the provider info into a well-known file on the shared disk
     * variations on the inventory.yaml file

* We would like to have shared disk testing in the gate. Matt has started
   https://review.opendev.org/#/c/586363/ but it does not test multinode,

Note that apart from the sample tools described above, which might
be in the placement repo, the required actions here are on the nova
side. At least until we find bugs on the placement side resulting
from this work.

[1] https://review.opendev.org/#/c/650188/
[2] https://review.opendev.org/382613

Chris Dent                       ٩◔̯◔۶           https://anticdent.org/
freenode: cdent                                         tw: @anticdent

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