nova/releasenotes/notes/stop-scheduling-to-disabled...

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---
features:
- |
Support for filtering out disabled cells during scheduling for server
create requests has been added. Firstly the concept of disabled
cells has been introduced which means such disabled cells will not be
candidates for the scheduler. Secondly changes have been made to the filter
scheduler to ensure that it chooses only the enabled cells for scheduling
and filters out the disabled ones. Note that operations on existing
instances already inside a disabled cell like move operations will not be
blocked.
upgrade:
- |
If the scheduler service is started before the cell mappings are created or
setup, nova-scheduler needs to be restarted or SIGHUP-ed for the newly
added cells to get registered in the scheduler cache.