Hi Emir,

I'll try to answer, but hopefully Andy will chime in to confirm.

In the upcoming release, the copying vmdk for long-term reservations
has been fixed. It's using snapshots to achieve. Resulting in faster
boot time.

On the vms per host question. This is very good question. So far your
100 vms per host is the highest I've heard about. As your aware, the
number of vms and end-user performance is going to depend on the
underlying hardware (host mem&CPU, network, and storage).

It would be good as a community for us to share hardware
recommendations on what is working well at their own site.  We have a
mix of hardware at NCSU, I'll write up some details and send that out
in a separate thread soon.


On Thu, Apr 26, 2012 at 3:56 PM, Emir Imamagic <eimam...@srce.hr> wrote:
> Hello,
> We've noticed that in case of long term reservations VCL copies the virtual
> disk of image on datastore. In case of images with many subimages (>20) we
> experienced problems with this copying. VCL would initiate multiple
> vmkfstools commands, ESXi server would get overloaded and start killing
> vmkfstools processes (messages were indicating lack of memory). Is there any
> way to bypass this behavior?
> Is this copying really needed? Is it possibly to switch it off in a clean
> manner?
> Another question is - how many VMs can vcld handle per a single VM host
> (VMware ESXi 4.1)?
> On our setup we managed to start 100 VMs on a single VMware host and it was
> still working fine. VM host has 24 cores and 256GB RAM.
> Thanks in advance
> --
> Emir Imamagic
> SRCE - University of Zagreb University Computing Centre, www.srce.unizg.hr
> emir.imama...@srce.hr, tel: +385 1 616 5809, fax: +385 1 616 5559

Aaron Peeler
Program Manager
Virtual Computing Lab
NC State University

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