This link may be helpful

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2000935



On May 24, 2012, at 5:32 PM, Alexander Patterson 
<alexander.patter...@csueastbay.edu> wrote:

> I'm not sure from what I have been reading, might want to contact your
> VMware Rep and see what they can do if you plan on upgrading to 5.
> 
> WIth ESXI 4.1
> 
> Infrastructure limitations
> Some limitations in ESX Server 4 may constrain the design of data centers:
> Guest system maximum RAM: 255 GB
> Host system maximum RAM: 1 TB[
> Number of hosts in a high availability cluster: 32
> Number of Primary Nodes in ESX Cluster high availability: 5
> Number of hosts in a Distributed Resource Scheduler cluster: 32
> Maximum number of processors per virtual machine: 8
> Maximum number of processors per host: 160
> Maximum number of cores per processor: 12
> Maximum number of virtual machines per host: 320
> VMFS-3 limits files to 262,144 (218) blocks, which translates to 256
> GB for 1 MB block sizes (the default) or up to 2 TB for 8 MB block
> sizes.However, on a VMFS Boot drive, it is usually very difficult to
> use anything other than 1 MB Block size
> 
> With ESXI 5 there has been some changes to these limits
> Guest system maximum RAM: 1 TB
> Host system maximum RAM: 2 TB
> Number of hosts in a high availability cluster: 32
> Maximum number of processors per virtual machine: 32
> Maximum number of processors per host: 160
> Maximum number of cores per processor: 25
> Maximum number of virtual machines per host: 512
> VMFS-3 is supported and has the same limits as before
> VMFS-5 however has a max volume size of 64 TB and a max file size of 2
> TB - 512 B
> How much vRAM does a VMware vSphere Hypervisor license provide?
> vSphere Hypervisor license provides a vRAM entitlement of 32GB per
> server, regardless of the number of physical processors. vSphere
> Hypervisor can be used on servers with maximum physical RAM capacity
> of 32GB.
> 
> On Thu, May 24, 2012 at 2:20 PM, Sanders, Arbin D <asand...@nccu.edu> wrote:
>> 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)
>> 
>> 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.
>> 
>> 
>> -----Original Message-----
>> From: Alexander Patterson [mailto:alexander.patter...@csueastbay.edu]
>> Sent: Thursday, May 24, 2012 5:17 PM
>> To: vcl-dev@incubator.apache.org
>> Cc: vcl-u...@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-dev@incubator.apache.org
>>> Cc: vcl-u...@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-u...@incubator.apache.org" <vcl-u...@incubator.apache.org>,
>>> "'vcl-dev@incubator.apache.org'" <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
>>>> 
>>> Reply-To: "vcl-u...@incubator.apache.org"
>>> <vcl-u...@incubator.apache.org>
>>> 
>>> Date: Wednesday, May 23, 2012 3:53 PM
>>> 
>>> To: "'vcl-dev@incubator.apache.org'" <vcl-dev@incubator.apache.org>,
>>> "'vcl-u...@incubator.apache.org'" <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
>>> 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
>> 
>> ______________________________________________________________________
>> This email has been scanned by the Symantec Email Security.cloud service.
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>> ______________________________________________________________________
>> 
>> ______________________________________________________________________
>> This email has been scanned by the Symantec Email Security.cloud service.
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> 
> 
> 
> -- 
> Thanks,
> Alex  Patterson
> User Support Services
> Operating System Analyst
> California State University, East Bay

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