[one-users] CPU and Memory Overcommitment

[Igor Laskovy]

Thank you for reply!

One further question - how Fault Tolerance mechanism (via HOST_HOOK) deal
with this reservations? Does it reserved some "slots" for VMs recovery? If
not and if I at every turn manually don't control available resources on
hosts those may cause to situation when my automatically recreated VMs will
stuck in placement state.


On Wed, Sep 4, 2013 at 12:23 PM, Carlos Martín Sánchez <
cmartin at opennebula.org> wrote:

> Hi,
>
> On Tue, Sep 3, 2013 at 1:32 PM, Igor Laskovy <igor.laskovy at gmail.com>wrote:
>
>> Hello all!
>>
>> I found that this already have discussed not so far from now -
>> http://comments.gmane.org/gmane.comp.distributed.opennebula.user/10568
>>
>> As understand for now about Memory over-commitment for production I can
>> forget ;)
>>
>> For CPU over-commitment I can only use CPU & VCPU attributes, right?
>>
>
> That's right
>
>
>> If I will, for example, set CPU to 0.2, than host will do only
>> reservation of processor time for that VM OR do limit ether, so this VM
>> will limited of 1/5 of one physical/logical hardware core?
>>
>
> We enforce the CPU reserved at hypervisor level with cgroups for kvm,
> credit scheduler for xen, and the esx cpu scheduler for vmware
>
> Regards
>
> --
> Join us at OpenNebulaConf2013 <http://opennebulaconf.com/> in Berlin,
> 24-26 September, 2013
> --
> Carlos Martín, MSc
> Project Engineer
> OpenNebula - The Open-source Solution for Data Center Virtualization
> www.OpenNebula.org <http://www.opennebula.org/> | cmartin at opennebula.org
>  | @OpenNebula <http://twitter.com/opennebula>
>



-- 
Igor Laskovy
facebook.com/igor.laskovy
studiogrizzly.com
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