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

["admin@xxxxxxxxxxx" <admin@xxxxxxxxxxx>]

You should measure the performance of the SAN using something like 
IOmeter (running IOmeter on the hardware you plan to run XenServer or 
XCP on).  Assuming you configure those drives in RAID10, I would guess 
that SAN would deliver about 2,000 to 5,000 IOPS.  If you use RAID5 
(please don't), then you will see far less IOPS during mixed read and 
write tests.
If you want to deploy 100 VMs onto that SAN, then each VM is only have 
to have 20-50 IOPS (assuming RAID10).  The performance in each VM will 
be less than fantastic.  If the VMs need to do any IO intensive tasks, 
the owners of the VMs are probably going to complain about sluggish 
performance.  I don't think the SAN you listed can deliver enough IOPS 
to satisfy 100 VMs.
On 1/13/2013 12:17 PM, Andrey wrote:
> Well, storage is the direct-connect HP P2000 G3 FC dual-controller 
> array with 600GBx24 disks in dual-path configuration (two HBA ports -> 
> two controllers ports). I guess it is quite enough.
> 13.01.2013 20:45, admin@xxxxxxxxxxx ÐÐÑÐÑ:
> > 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.
> > > >
> > > >
> > > > Wei.
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> >
> >
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