[one-users] OpenNebula 3.2 need memory and CPU over-commit.

[Maxim Mikheev]

Hi Everyone,

We are using Open Nebula on Ubuntu 11.10. Our VM's usually never use a 
whole system in the same time. But when they are active they usually 
require huge amount of computational power.

OpenNebula has a protection from Overcommitment of memory and CPU. I 
have a question: How can I manually setup Overcommitment by factor 2 for 
CPU and Memory?
Significant amount of memory is helpful for our calculations but all 
this extra memory is a caches. It means that nothing will be happen if 
Cache size will be decreased for the VM. The cache  can be dynamically 
scale down by balloon driver which is a default for Libvirt and KVM in 
Ubuntu.
It means that I absolutely sure that would like to over-commit memory. 
There are no problem for a processor too. Our calculations took usually 
several days and one day extra for one VM does not change anything.
I already used these scheme with over-commitment on Proxmox and it works 
well.

Regards,
     Max