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Hi Jay, I do agree about 10% being too much memory in big nodes, but right
now we are using small ones (too small if you ask). These new nodes are
16GB so if I reserve 4 Gb for the dom0 I'd be loosing 25% of the available
RAM. I was thinking about something like: if you have got less than 32GB
give 10% of it to the dom0 and If you have got more than 32GB go with 4GB
for the dom0. Maybe different environments will need different rules, but
this should work in most standar deployments I'd say. Jay, you mentioned
that big nodes running many VMs don't neet more than 4GB of dedicated RAM,
haven't you ever had any swapping situation in that kind of scenarios?


2014-09-04 14:26 GMT-03:00 Jay Pipes <jaypipes at gmail.com>:

> There's not really any need for 10% in my experience. Giving dom0/bare
> metal around 3-4GB is perfectly fine for the vast majority of scenarios,
> even when there's a hundred or more VMs on the box. Most compute node
> server hardware nowadays should have 128-512GB of RAM available, and 4GB
> for the host is more than enough.
>
> -jay
>
>
> On 09/04/2014 12:45 PM, Juan José Pavlik Salles wrote:
>
>> Hi Tomasz, thanks for your answer. I'll start with 10% and see what
>> happens. Thanks again!
>>
>>
>> 2014-09-04 13:37 GMT-03:00 Tomasz Napierala <tnapierala at mirantis.com
>> <mailto:tnapierala at mirantis.com>>:
>>
>>
>>
>>     On 04 Sep 2014, at 18:04, Juan José Pavlik Salles
>>     <jjpavlik at gmail.com <mailto:jjpavlik at gmail.com>> wrote:
>>
>>      > Hi guys, I'm running a Grizzly cloud with Ubuntu 12.04+KVM. I'd
>>     like to know if there's any kind of recommended free RAM for the
>>     Hypervisor. I know there's a nova variable called "
>>      > reserved_host_memory_mb" but don't know what a proper value would
>> be.
>>
>>     Check on deployed compute node that has no running VMs, add some
>>     margin, say 10% and you should be fine. Usually compute nodes are
>>     not consuming extra memory besides VMs.
>>
>>     Regards,
>>     --
>>     Tomasz 'Zen' Napierala
>>     Sr. OpenStack Engineer
>>     tnapierala at mirantis.com <mailto:tnapierala at mirantis.com>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> --
>> Pavlik Salles Juan José
>> Blog - http://viviendolared.blogspot.com
>>
>>
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-- 
Pavlik Salles Juan José
Blog - http://viviendolared.blogspot.com
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