VM performance in after vMotion/HA

1. Do you have a simple configuration guide to ensure few critical vms performance are NOT affected badly after it has been vmotioned/HA when residing on another Host.  Or in other words, before I do a VM/HA I want to ensure the VMs gets the best resources for performance.

2.  Before you do a vmotion of all existing VMs on a Host to another Host or do a HA in a clustered environment,  can I come to know before, what is the maximum  vms  a specific Host can take? Are there any tools available.

2. Is there any way to ascertain  as to how many VMs, CPUs, Memory can be  assigned on a specific Host?

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
1. Make sure your Hosts are not overcomitted, and any VMs you manually moved (vMotion) have the resources on the host. VMware HA will not power on VMs, if you do not have the resources, by default!

2. Memory - does your host have the free memory to accomodate this VM.

3. No. But memory is often the bottleneck.

So if you have a host with 128GB of memory, roughly that Host can accommodate 30 VMs of 4GB each!

40 VMs of 4GB is too much - simple calculations.

If you want to do the science, then use a reporting tool, e.g. vCops, or now what is called vRops, and this will produce reports and WhatIf reports, on how many more VMs you can accomodate.
cgeorgeisaacAuthor Commented:
Thank you for your prompt and very helpful reply.
However,  could you point me to a specific link/guide  to provision a VM where I can allocate  High resources using  Cluster/Resource pool etc., in vSphere 5.5
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:

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