Alexander,

What if I use the paid version of vSphere5? And I have 96 GB of memory? Could I 
get more than 20 VMs?

Arbin Darren Sanders
 
IT Manager - Academic Computing
North Carolina Central University
712 Cecil Street
Suite 3014
Durham, NC 27707
919.530.6307
919.530.5097 (Fax)

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-----Original Message-----
From: Alexander Patterson [mailto:alexander.patter...@csueastbay.edu] 
Sent: Thursday, May 24, 2012 5:17 PM
To: vcl-...@incubator.apache.org
Cc: vcl-user@incubator.apache.org
Subject: Re: Max Number of VMs per Host

Hello,

ESXI 5 is limit by licenses with the amount of ram you can run on each machine.
The 8 GB vRAM limit is for the upcoming 5.0 free Hypervisor, the 4.x version 
had no such memory limits.
VM makes you pay now if you want to use X amount of ram per host with the 
upcoming version.

Making 4.1 I Free Version a much more attractive option to go with

We have each of our blades running ESXI 4.1 with 16 Cores and 48 GB of ram and 
we have 20 VM's per blade but we give 1.5 GB of ram to each VM.

More info here
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1014006

-Alex

On Thu, May 24, 2012 at 2:09 PM, Sanders, Arbin D <asand...@nccu.edu> wrote:
>
> I am planning on using a free version of vSphere 5 depending on the how many 
> VMs I can get. I would like to get 50 VMs per host.
>
>
>
> Arbin Darren Sanders
>
>
>
> IT Manager - Academic Computing
>
> North Carolina Central University
>
> 712 Cecil Street
>
> Suite 3014
>
> Durham, NC 27707
>
> 919.530.6307
>
> 919.530.5097 (Fax)
>
>
>
> For the Latest ITS Updates and Tips Join Us Online
>
>
>
> CONFIDENTIALITY: This email (including any attachments) may contain 
> confidential, proprietary and privileged information, and unauthorized 
> disclosure or use is prohibited. If you received this email in error, please 
> notify the sender and delete this e-mail from your system.
>
>
>
> From: Dmitri Chebotarov [mailto:dcheb...@gmu.edu]
> Sent: Thursday, May 24, 2012 12:01 PM
> To: vcl-...@incubator.apache.org
> Cc: vcl-user@incubator.apache.org
>
>
> Subject: Re: Max Number of VMs per Host
>
>
>
> 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>
> To: "vcl-user@incubator.apache.org" <vcl-user@incubator.apache.org>, 
> "'vcl-...@incubator.apache.org'" <vcl-...@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
> >
> Reply-To: "vcl-user@incubator.apache.org" 
> <vcl-user@incubator.apache.org>
>
> Date: Wednesday, May 23, 2012 3:53 PM
>
> To: "'vcl-...@incubator.apache.org'" <vcl-...@incubator.apache.org>, 
> "'vcl-user@incubator.apache.org'" <vcl-user@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
> 919.530.6307
> 919.530.5097 (Fax)
>
> For the Latest ITS Updates and Tips Join Us Online
>
> CONFIDENTIALITY: This email (including any attachments) may contain 
> confidential, proprietary and privileged information, and unauthorized 
> disclosure or use is prohibited. If you received this email in error, please 
> notify the sender and delete this e-mail from your system.
>
>
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--
Thanks,
Alex  Patterson
User Support Services
Operating System Analyst
California State University, East Bay

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