On 09/04/2014 01:51 PM, Juan José Pavlik Salles wrote:
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.
I'd go with something like this:
Host RAM dom0/reserved host RAM
================== ======================
16 - 32 GB 2 GB
32 - 64 GB 2.75 GB
64 - 128 GB 3.50 GB
128 - 256 GB 4.25 GB
256+ GB 5.50 GB
If you have heavy packing of VMs (lots of tiny or small VMs), you may
want to add a half GB to the above, but not much more than that, IMO)
> 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?
No, not on the compute nodes, no. On the controller nodes, yes, but
that's a totally different thing :)
Best,
-jay
2014-09-04 14:26 GMT-03:00 Jay Pipes <[email protected]
<mailto:[email protected]>>:
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
<[email protected] <mailto:[email protected]>
<mailto:tnapierala@mirantis.__com
<mailto:[email protected]>>>:
On 04 Sep 2014, at 18:04, Juan José Pavlik Salles
<[email protected] <mailto:[email protected]>
<mailto:[email protected] <mailto:[email protected]>>> 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
[email protected] <mailto:[email protected]>
<mailto:tnapierala@mirantis.__com <mailto:[email protected]>>
--
Pavlik Salles Juan José
Blog - http://viviendolared.blogspot.__com
<http://viviendolared.blogspot.com>
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Blog - http://viviendolared.blogspot.com
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