Open Stack

Le 26/08/2014 17:35, Simon Pasquier a écrit :
> Hi,
> 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.
>
>
> Simon
>
> [1] 
> http://docs.openstack.org/trunk/config-reference/content/section_compute-scheduler.html 
>
>
>

Simon is absolutely right, you need to make use of a RAMWeighter with 
negative pound.
At the moment, that's only possible for RAM, there is another patch in 
progress for consolidating over CPUs [2]


[2] https://review.openstack.org/109325


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