Re: [Xen-users] How many VMs on single server...

[Andy Smith <andy@xxxxxxxxxxxxxx>]

Hi Alessandro,

On Thu, Aug 23, 2007 at 06:05:02PM +0200, Alessandro R. wrote:
> Hi List,
> 
> is there mathematical method to calculate how many VMs I can run on a
> single server?

No, since it depends on what resources the individual domains need.

For example, my users tend to use more IO than CPU or RAM, so I
always run out of disk spindles before I run out of disk space, RAM
or CPU.

Others may well have users that need a lot of RAM, or are CPU-bound,
or whatever.

> For example: in my setting I have one server with Intel Xeon 3050 Dual
> Core - single socket - with 4GB Ram and 2 hdd of 250GB SATA; hard
> drive is mirroring with software RAID and I'm using an image disk for
> xen VM. I want run only HVM vm.
> 
> How many VMs can I run on this?

One, if it needs ~4G RAM and ~250G of disk.

> Now I'm using RAM as delta (suppose to give 5-10 GB of disk space):
> if I give for each VM 256MB of RAM I will be able to start 14 domU
> with 90 - 100 MB of RAM in dom0.

You will have no problem starting and running 14, 15, 20, 30, maybe
100s of domains.  Whether they have enough resources to do what you
want them to do is another question.

Cheers,
Andy

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