[Openstack] significanse of reserved_host_memory_mb

mad Engineer themadengin33r at gmail.com
Thu Nov 27 12:55:52 UTC 2014


it reports "Free ram (MB): 425"
but free -m has different result.

Is it working for you.Are you using icehouse

On Thu, Nov 27, 2014 at 6:16 PM, George Mihaiescu <lmihaiescu at gmail.com> wrote:
> Then I would enable debug and verbose in nova.conf and restart the scheduler
> service. In this way you should see in the logs the entire scheduler logic
> and what resources it thinks your host has.
>
> On 27 Nov 2014 06:20, "mad Engineer" <themadengin33r at gmail.com> wrote:
>>
>> 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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>>
>




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