openstack/ironic
Code Issues Proposed changes

Add nova scheduler_host_subset_size option to docs

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This should be set higher than the number of nodes in the deployment,
because otherwise nova will continue to pick the same nodes as instances
cycle out, meaning some machines may never be used while others get many
instances provisioned.

This also helps with scheduler races when booting a large number of
instances at the same time.

Change-Id: I5a898616743105fe5410d7370a91e5c60120b596
This commit is contained in:
Jim Rollenhagen 2016-08-03 09:01:48 -04:00
parent 863ffe984c
commit f4132778e6
1 changed files with 8 additions and 0 deletions
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8
doc/source/deploy/install-guide.rst
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@ -491,6 +491,14 @@ Compute service's controller nodes and compute nodes.*
#scheduler_tracks_instance_changes=True
scheduler_tracks_instance_changes=False
# New instances will be scheduled on a host chosen randomly from a subset
# of the N best hosts, where N is the value set by this option. Valid
# values are 1 or greater. Any value less than one will be treated as 1.
# For ironic, this should be set to a number >= the number of ironic nodes
# to more evenly distribute instances across the nodes.
#scheduler_host_subset_size=1
scheduler_host_subset_size=9999999
2. Change these configuration options in the ``ironic`` section.
Replace: