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

You will probably run out of disk IO before you run into any hard limits in XenServer or XCP.

What type of SAN are you going to use? What type of network interconnect will you use to link your XenServer/XCP nodes to your SAN? How many IOPS does your SAN deliver over your chosen network interconnect?

On 1/13/2013 9:03 AM, Andrey wrote:
Sure, will try. I see in XenServer 6.1 FAQ that maximum supported number of guests is 150 and it requires increasing dom0_mem to max 4096. It's obvious that internal limits are not quite realistic so it will be good result for me if we able to run at least 100 guests. It seems that it is more realistic number although some resources note maximum number of VMs as 4-10 per CPU core (so 32-80 in my case). But in all these cases 192 GB RAM would be redundant I think.

With regards, Andrey

11.01.2013 16:43, Wei Liu ÐÐÑÐÑ:
On Fri, 2013-01-11 at 12:24 +0000, Andrey wrote:
Thank you for the answer

I'm really consider the case with creating as many DomUs as possible
with typical load and get practical info.

What about network capacity? Does this math implies to the network
resources? Should we shape the DomUs bandwidth to prevent network
overload? Can CPU be bottleneck in this configuration?

The math I did was to show you some internal infrastructure limits that
I know.

CPU / network overloading is another topic. TBH I haven't done stress
tests on CPUs and network.

And whether you will hit any bottlenecks in CPU / network or not relates
closely to your use case. Boot up DomUs and do some typical workload is
a good idea.


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