HA Testing in VMware

1. Is there any way I can Test OR   Confirm that HA will definitely work in vSphere  5.5,  before I  manually do it.
2. Are there any specific  Tools (even Third Party) available to confirm this.

I require this  since some maintenance tasks need to be performed on the  ESXi Hosts.
cgeorgeisaacAsked:
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JeffMatthiasCommented:
No you can't test HA unless you have an outage of one of the hosts.  Just be sure your other hosts have enough memory and CPU to handle the load before removing one.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
This is simple

1. Is there any way I can Test OR   Confirm that HA will definitely work in vSphere  5.5,  before I  manually do it.

Move all Production Virtual Machines to another host. Create a virtual machine for test purposes on the host to be tested.

PULL THE POWER OUT OF THE HOST TO BE TESTED!

VMware HA - needs an uncontrolled failure!

VMs will be restarted on other available hosts in the cluster, within 1-2mins.

if they do not, HA has failed
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cgeorgeisaacAuthor Commented:
Thank you Jeff and Andrew.
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cgeorgeisaacAuthor Commented:
I had seen Andrew's   advise ONLY after I had given  JeffMatthias the full marks.  When you see only one answer posted, I as the requestor get a feeling that, that is the ONLY answer!   I guess I should have waited for some more time.   If possible you may give Andrew 350 points and  JeffMatthais 150 points please.  Thanks.
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JeffMatthiasCommented:
You can't test HA without actually forcing HA.  That is what I meant and it still holds true.  You can't test HA you have to just create a failover event by removing a NIC or shutting down one of the host.

Technically it can't be TESTED until you actually do it.
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