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Some improvements in Nova Scheduler config

Registered by Dmitry Ukov on 2014-03-07

These improvements will help to reach more smooth VM distribution across non-homogeneous compute nodes.
Core and Disk filters are enabled as well.
---nova.conf---
scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,CoreFilter,DiskFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter
cpu_allocation_ratio=1.0
disk_allocation_ratio=1.0
ram_allocation_ratio=1.0
ram_weight_multiplier=0.0
scheduler_host_subset_size=30
---

Blueprint information

Status:: Complete

Approver:: Vladimir Kuklin

Priority:: Low

Drafter:: Dmitry Ukov

Direction:: Approved

Assignee:: Sergii Golovatiuk

Definition:: Approved

Series goal:: Accepted for 5.0.x

Implementation:: Implemented

Milestone target:: 5.0

Started by: Mike Scherbakov on 2014-04-25

Completed by: Vladimir Kuklin on 2014-05-01

Related branches

Related bugs

Bug #1300027: Core and Disk filters are disabled by default

Fix Committed

Sprints

Whiteboard

Just for note: Nova compute RAM/CPU overcommitment options: cpu_allocation_ratio (default 16) , ram_allocation_ratio (default 1.5), disk_allocation_ratio (default 1.0).

Core and Disk filters should be enabled (they are disabled by default) in order to avoid compute node oveloading
- cpu_allocation_ratio=1.0 - Default 16.0 is way to big over commit ratio (potentially 16 vms on 1 core). 2.0 or 3.0 will be reasonable here.
- disk_allocation_ratio=1.0 - it is unsafe to over commit disk
- ram_allocation_ratio=1.0 - Actually we can use default value here.
- ram_weight_multiplier=0.0 and scheduler_host_subset_size=30 will help us to get random VMs distribution if compute nodes significantly differ from each other in terms of total RAM amount

Gerrit topic: https://review.openstack.org/#q,topic:bug/1300027,n,z

Addressed by: https://review.openstack.org/90106
Implements filters and schedules in nova.cfg

Addressed by: https://review.openstack.org/97998
Implements filters and schedules in nova.cfg

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Work Items

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