scheduler: Add instance number as weight when select hosts
Currently nova filter hosts by using given filters, then it will select
the 'best' match host by sorting the hosts with its weight. Currently
there are 2 weight object existing, one is metrics and the other is ram weight;
metrics weight is mostly for monitor so ram is the only one widely used.
If we have following scenarios: 1 host with 10G memory and already has
5 vms each has 1G virtual memory, another host has 2G memory without
any vm on it. Currently scheduler will select the first host because it
has more memory left but apparently it will increase the workload of the host
e.g. I/O rate etc.
Blueprint information
- Status:
- Started
- Approver:
- John Garbutt
- Priority:
- Low
- Drafter:
- jichenjc
- Direction:
- Needs approval
- Assignee:
- jichenjc
- Definition:
- Pending Approval
- Series goal:
- None
- Implementation:
-
Needs Code Review
- Milestone target:
- None
- Started by
- John Garbutt
- Completed by
Related branches
Related bugs
Sprints
Whiteboard
Accepted into juno. Seems Ok, and this doesn't need a spec. --johnthetubaguy 13th October 2014
Gerrit topic: https:/
Addressed by: https:/
Create Nova Scheduler Num Instances Weighter
Bumping to k-2 -- mikal 9 Dec 2014
Sorry, we have now hit the non-priority feature freeze for kilo. Please resubmit your spec for the L release. --johnthetubaguy 5th Feb 2015
Re-approving for liberty, doesn't need a spec --johnthetubaguy 13th April 2015
Re-approving for mitaka --johnthetubaguy 13th October 2015
Sorry, we have now hit the Non-Priority Feature Freeze for Mitaka. For more details please see: http://
--johnthetubaguy 2016.01.30
