<div dir="ltr">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?</div>
<div class="gmail_extra"><br><br><div class="gmail_quote">2014-09-04 14:26 GMT-03:00 Jay Pipes <span dir="ltr"><<a href="mailto:jaypipes@gmail.com" target="_blank">jaypipes@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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.<br>
<br>
-jay<div class=""><br>
<br>
On 09/04/2014 12:45 PM, Juan José Pavlik Salles wrote:<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="">
Hi Tomasz, thanks for your answer. I'll start with 10% and see what<br>
happens. Thanks again!<br>
<br>
<br>
2014-09-04 13:37 GMT-03:00 Tomasz Napierala <<a href="mailto:tnapierala@mirantis.com" target="_blank">tnapierala@mirantis.com</a><br></div>
<mailto:<a href="mailto:tnapierala@mirantis.com" target="_blank">tnapierala@mirantis.<u></u>com</a>>>:<div class=""><br>
<br>
<br>
On 04 Sep 2014, at 18:04, Juan José Pavlik Salles<br></div><div class="">
<<a href="mailto:jjpavlik@gmail.com" target="_blank">jjpavlik@gmail.com</a> <mailto:<a href="mailto:jjpavlik@gmail.com" target="_blank">jjpavlik@gmail.com</a>>> wrote:<br>
<br>
> Hi guys, I'm running a Grizzly cloud with Ubuntu 12.04+KVM. I'd<br>
like to know if there's any kind of recommended free RAM for the<br>
Hypervisor. I know there's a nova variable called "<br>
> reserved_host_memory_mb" but don't know what a proper value would be.<br>
<br>
Check on deployed compute node that has no running VMs, add some<br>
margin, say 10% and you should be fine. Usually compute nodes are<br>
not consuming extra memory besides VMs.<br>
<br>
Regards,<br>
--<br>
Tomasz 'Zen' Napierala<br>
Sr. OpenStack Engineer<br></div>
<a href="mailto:tnapierala@mirantis.com" target="_blank">tnapierala@mirantis.com</a> <mailto:<a href="mailto:tnapierala@mirantis.com" target="_blank">tnapierala@mirantis.<u></u>com</a>><div class=""><br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
--<br>
Pavlik Salles Juan José<br>
Blog - <a href="http://viviendolared.blogspot.com" target="_blank">http://viviendolared.blogspot.<u></u>com</a><br>
<br>
<br></div>
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</blockquote>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr">Pavlik Salles Juan José<div>Blog - <a href="http://viviendolared.blogspot.com" target="_blank">http://viviendolared.blogspot.com</a></div></div>
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