[rhelv6-list] Minimal RAM for a RHEL6 KVM host?

[Danishka Navin]

On Thu, Feb 3, 2011 at 10:38 PM, Phil Meyer <pmeyer at themeyerfarm.com> wrote:

> On 02/03/2011 09:00 AM, carlopmart wrote:
>
>> Hi all,
>>
>>  Which is the minmal amount of RAM needed for a RHEL6 KVM host?? I read
>> RedHat's docs about this, and it seems 2GB ... Really??
>>
>>  Is it possible to limit RAM used by the KVM host as a Xen does??
>>
>>  Thanks.
>>
>
> Xen dom0 is a tiny, raw hypervisor using bits of the Linux kernel to
> operate hardware.
>
> KVM is a kernel module based hypervisor.  Thus it uses the full kernel and
> OS with all that implies.
>
> VMs utilizing the KVM hypervisor run as applications in the host
> application space.  This is totally different than Xen.
>
> It has great advantages, and a few disadvantages.
>
> Using KVM, you have to think of the VMs as fixed sized applications.
>
> Want to run 2 4GB KVM VMs?  The host needs to have more than 8GB available
> to it in order to dedicate RAM to the VMs as well as manage its own
> resources.
>
>
but i have given 3GB for my VM where the base system has 2GB of RAM.
i was just testing not for production.

Base OS is Fedora 14 and Guest is RHEL6


> I am bending the specifics slightly to make the point that KVM based VMs
> run on top of a full kernel/OS, and that KVM VMs are treated as applications
> within that space.
>
> Hope this helps.
>
> Good Luck!
>
>
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-- 
Danishka Navin
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