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Re: [Xen-users] Please help estimate number of the domUs

On Fri, 2013-01-11 at 09:00 +0000, Andrey wrote:
> Hello,
> Is it possible to estimate how many PV domUs (for the VPS, for example 
> with 512MB-1GB memory) can be run on the server with the following 
> specifications:
> HP DL380p Gen8
> 2 CPU Intel Xeon E5-2509 2.4Ghz (8 cores)
> 192GB RAM
> Storage is HP P2000 G3 FC dual-controller array with 600GBx24 disks 
> directly connected to the server.

If your VPS has 512MB RAM, then you can in theory have 192/0.5 = 384
guests. Typical DomU needs at least 4 event channels (1 xenconsole, 1
xenstore, 1 disk, 1 vif). If your Dom0 is 32 bit then you can hit event
channel limit because 32 bit Dom0 only has 1024 event channels. If your
Dom0 is 64 bit then it has 4096 event channels and this will not be a

Xenconsoled and CXenstored/OXenstored has implementation limits that
they can only handle 1024 fds in the event loop.

One way to estimate the real limit is to boot up as many Mini-OS as
possible. It is very easy to do this and you can get much more practical
information than pure maths.

Hope this helps.


> Actually I'm in stage of planning server and storage resources (network, 
> domU storage) to provide VPS hosting. Where can I get additional 
> information about that for Xen?
> With regards, Andrey
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxx
> http://lists.xen.org/xen-users

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