Here is some info:  

http://myvirtualcloud.net/?p=1155

This is for VMware View which could be approximated to VCL.

There is also limits per VMFS datastore (if you not using NFS).  
I have seen different recommendations for VM number per ESXi host per shared 
VMFS - VMWare recommends 16 VMs per Host for shared VMFS for VMFS-v3.

What hypervisor do use for VCL?

Thanks.   


--
Thank you,

Dmitri Chebotarov
Virtual Computing Lab Systems Engineer, TSD - Ent Servers & Messaging
223 Aquia Building, Ffx, MSN: 1B5
Phone: (703) 993-6175
Fax: (703) 993-3404


On Thursday, May 24, 2012 at 11:42 , Young h Oh wrote:

> Normally, you can calculate the average number of VMs depends on the 
> computing power (CPU). For example, 1 physical core can supports 2 VMs with 2 
> GB RAM. If you have 2 CPUs with 16 cores, then you might run 32VMs with 64GB 
> RAM. However,  the max number of VMs per host depends on variable facts as Al 
> Quiros mentioned, In addition to Al's comments, you might also consider the 
> application you want to run on guest VMs. If applications are more 
> computation intensive, the number of CPUs would be important fact to decide 
> the max number of VMs per host.  
>  
>  In our environment, we don't use VMware but running  RHEL 6 x64 with KVM on 
> IBM blade hosts with 16 CPUs and 24GB RAM. We run average 15 Windows XP VMs 
> with 1GB memory without much performance overhead. However, we can run  up to 
> 22 VMs  but the performance was not good.  
>  
> Best regards,
> --------------------------------------------------------------------
> Young Hyun Oh
> IBM Tivoli  
>  
> Evelio Quiros ---05/24/2012 10:58:12 AM---Hello, As you know, the number of 
> Virtual Machines per host depends on available resources (CPU, RAM
>  
> From: Evelio Quiros <evq...@fiu.edu (mailto:evq...@fiu.edu)>
> To: "vcl-u...@incubator.apache.org (mailto:vcl-u...@incubator.apache.org)" 
> <vcl-u...@incubator.apache.org (mailto:vcl-u...@incubator.apache.org)>, 
> "'vcl-dev@incubator.apache.org (mailto:vcl-dev@incubator.apache.org)'" 
> <vcl-dev@incubator.apache.org (mailto:vcl-dev@incubator.apache.org)>,  
> Date: 05/24/2012 10:58 AM
> Subject: Re: Max Number of VMs per Host
>  
>  
>  
> Hello,
>  
> As you know, the number of Virtual Machines per host depends on available 
> resources (CPU, RAM, Disk), as well as the demands of the image.  
> As a general guide, I have found the following to be reasonable. Other 
> admins, please share your opinions.
>  
> For a single VM host with 12 virtual CPU and 98 GB RAM, I typically allocate 
> 25 Windows VM. When necessary, I have raised it to 32 Windows XP machines. 
> For linux based images, I have used 50 VM without issues. Monitor the 
> performance tab on your vSphere client to see if the host is over-worked.  
> On Virtual Machines that require higher performance, I usually will not place 
> them on a host with more than 10 working VM. But the most important thing is 
> to watch the performance closely. You will get a feel for how many VM per 
> host by experience.
> As always, your mileage may vary.
>  
> Regards,
> Al Quiros
> Florida International University
>  
>  
> From: <Sanders>, Arbin D <asand...@nccu.edu (mailto:asand...@nccu.edu)>
> Reply-To: "vcl-u...@incubator.apache.org 
> (mailto:vcl-u...@incubator.apache.org)" <vcl-u...@incubator.apache.org 
> (mailto:vcl-u...@incubator.apache.org)>
> Date: Wednesday, May 23, 2012 3:53 PM
> To: "'vcl-dev@incubator.apache.org (mailto:'vcl-dev@incubator.apache.org)'" 
> <vcl-dev@incubator.apache.org (mailto:vcl-dev@incubator.apache.org)>, 
> "'vcl-u...@incubator.apache.org (mailto:'vcl-u...@incubator.apache.org)'" 
> <vcl-u...@incubator.apache.org (mailto:vcl-u...@incubator.apache.org)>
> Subject: Max Number of VMs per Host
>  
> All,
>   
> What is the number of VMs do you all run per VMware host? Is it limited to 
> the RAM limitation for vSphere 5? How many purchase vSphere licenses?
>   
> Arbin Darren Sanders
>   
> IT Manager – Academic Computing
> North Carolina Central University
> 712 Cecil Street
> Suite 3014
> Durham, NC 27707
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