[Openstack-operators] consolidation options for nova scheduler

Simon Pasquier spasquier at mirantis.com
Tue Aug 26 15:35:17 UTC 2014

IIUC you probably want to set ram_weight_multiplier to a negative number.
>From the OpenStack documentation [1]:

By default, the scheduler spreads instances across all hosts evenly. Set
> the ram_weight_multiplier option to a negative number if you prefer
> stacking instead of spreading. Use a floating-point value.



On Tue, Aug 26, 2014 at 5:01 PM, George Shuklin <george.shuklin at gmail.com>

> Good day.
> I can't find any options for nova scheduler to consolidate new instances
> on few hosts instead of 'spreading' them on all available hosts.
> Simple example: let says we has 10 hosts, each host got 10Gb of memory for
> instances. We has flavors of 3Gb and 5Gb of RAM. If we run 20 new
> instances, they will consume about 6Gb per host and we will not able to run
> new instance with 6Gb of RAM (even we have 10*4=40 Gb of free memory on
> computes, none of the hosts has more than 4Gb of memory).
> Is any nice way to say 'consolidate' to openstack? Thanks!
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