On 02/03/2011 06:08 PM, Phil Meyer 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.
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!
Thanks Phil. I will run minimal services on host side (ntp, postfix and kvm). In the
example that you explain, does enough with the host had, for example, 8.5 GB of RAM?
I don't need HA or Clustering services or to connect to external storage (I will use
local disks).
Thanks.
--
CL Martinez
carlopmart {at} gmail {d0t} com
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