[openstack-dev] blueprint for 'spare-hosts'

Matthew Sherborne msherborne at gmail.com
Fri Mar 22 16:27:34 UTC 2013


All comments appreciated.

https://blueprints.launchpad.net/nova/+spec/spare-hosts

In summary, when one sets up a nova install, they can set some of the
machines to spare.

Spare means disabled plus the guarantee that there are no customer vms
running on there.

It differs from maintenance mode in that setting a spare that has VMs on
it, will just fail, rather than cause a migration.

Spare machines can be used for quick chassis swaps or can be enabled to
receive an emergency migration, or when an end user needs more space than
was initially planned.

Having 'spare' machines in your install a useful safety buffer to let you
know when to start adding more.

https://wiki.openstack.org/wiki/Blueprint-spare-hosts#Possible_later_additions

----

Please comment on implementation ideas, additional features, and perceived
usefulness.

Many Thanks,
Matthew Sherborne
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