[Openstack] significanse of reserved_host_memory_mb

mad Engineer themadengin33r at gmail.com
Thu Nov 27 11:20:59 UTC 2014


George,
              overcommit of RAM is 1  and that is working.However instances
are still getting created with available free memory <
reserved_host_memory_mb

On Thu, Nov 27, 2014 at 4:33 PM, George Mihaiescu <lmihaiescu at gmail.com>
wrote:

> Depending on your overcommit ratio, the scheduler can schedule instances
> using more virtual memory than the available physical memory on the host,
> 700 MB in your case.
> On 27 Nov 2014 05:36, "mad Engineer" <themadengin33r at gmail.com> wrote:
>
>> hi all i have set
>> reserved_host_memory_mb in nova.conf of controller and compute and
>> restarted necessary services.
>> i am expecting scheduler to not pickup host that has less than what is
>> reserved_host_memory_mb
>> in my example i put reserved_host_memory_mb = 1024
>> and free RAM in compute node is 700 Mb.
>> But still scheduler chooses this host and created a new instance on it.I
>> am expecting scheduler to show "No valid Hosts found" as it has less ram
>> than reserved_host_memory_mb = 1024
>>
>> Can some one help me understand this value
>>
>> Thanks
>>
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