maximum recommended VM per VMFS datastore on vSphere 5.1 ?

Hi people,

How many VM is there that is considered to be maximum per VMFS 5 datastore ? I couldn't find anywhere on VMware Maximums doco.

I'm currently planning for the new VMFS datastore size and wondering about how big should I create the datastore.

how do I know if the VMFS datastore is currently running too many VMs ?

Thanks,
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Senior IT System EngineerIT ProfessionalAsked:
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GG VPCommented:
Hi,

Its present in the configuration maximum guide, in page 4, under VMFS,

VMFS

Powered-on virtual machines per VMFS volume -  2048


Link to max guide,

https://www.vmware.com/pdf/vsphere5/r51/vsphere-51-configuration-maximums.pdf
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GG VPCommented:
I would not recommend to create a single datastore and place all your VMs in it!

Read for yourself below links,

Best Practices

http://www.vmware.com/files/pdf/vmfs-best-practices-wp.pdf

http://www.yellow-bricks.com/2009/06/23/vmfslun-size/


VMware VMFS Datastore Sizing Calculator

http://thinkingloudoncloud.com/calculator/vmware-vmfs-datastore-sizing-calculator/
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It's not really a matter of how many, but the size you need to look at...

We create datastores between 500GB and 800GB which is suitable for us, sometimes we may create a supersize LUN/datastore for large VMs.

It's like do not stack all your eggs in one basket, the larger the datastore, the more chance you are likely to have many VMs per datastore, and if there is corruption in the datastore or LUN, you will have many VMs lost.

On average we have between 10 - 20 VMs per datastore.

BUT, ensure that you do not put like VMs in the same datastore....

e.g. Heavy SQL servers or Exchange Servers in the same datastore.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
ok, my initial plan is to build 2 TB VMFS LUN so that I can put around 15 VMs maximum (C: drive standard is 100 GB) while allowing 20% for snapshotting (VADP backup or manual snapshot).

Regarding putting in the like VM in the datastore, if the Data for Exchange and SQL Server is on Physical RDM, then is that still the matter for the C:\ drive to be on the same VMFS datastore ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, OS on the same datastore is fine, just the databases on different datastores.

You may be using DeDupe on your SAN on that datastore, and the recommendation for DeDepe is to put all your OS versions on the same datastore and LUN for DeDeupe.

So that's fine.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
ok, but generally, there should be no more than 20 running VMs as per your suggestion ?

which vSphere metric do I need to know and watch to prevent performance issue ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Datastore latency, read and write!

We generally put 10 - 20 VMs per datastore no more.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Thanks
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