Re: [Xen-users] Maximum number of VMs per xen server

[Pandu Poluan <pandu@xxxxxxxxxxx>]

On Mar 9, 2012 2:13 AM, "moftah moftah" <mofta7y@xxxxxxxxx> wrote:
>
> Hi,
>
> It looks like I am having problems when I create more than 100 VM in
> one xen node.
>
> up to 60 VMs there is zero problems and between 60 and 100 problems start
>
> more than 100 the node becomes unstable.
>
> The node has tons of memory (more than 30 GB free)
> also the node has 16 cores so the processor isnt the issue here.
> is there any limitation in xen that prevent the system from serving
> more than 100 VMs ?
>

You're pushing 6 VMs per core, if the VMs are not paravirtualized, that's a huge load. There's also the question of I/O bottleneck.

After starting the 60th VM, i.e., when slowdowns begin, how's the processor and I/O load?

Rgds,

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