HA-Change admission control policy on the cluster

Dear Experts,
Can we use in VMware HA, the Percentage of cluster resources reserved as failover spare capacity as admission control with two hosts.
sidy soumareIndependent IT Consulting - Senior Network and Systems EngineerAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
VMware HA when enabled by default, will require your other server to have the same resource CPU and Memory available for a FAILOVER.

Usually memory is the bottleneck.

So if you have enough space memory available on your others hosts you will not have an issue.
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sidy soumareIndependent IT Consulting      - Senior Network and Systems EngineerAuthor Commented:
So, I want make sure in two hypervisor cluster scenario the percentage admission control is accurate. Is it?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
What are you resources, how much memory is in use on host1?

how much is free on host2?

Also remember Admission Control is only a safeguard to prevent poor performance, on host2, when a HA action occurs, on host1 failure.

So if host1 is fully loaded, and it's a 64GB host, you will need host2+64GB
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sidy soumareIndependent IT Consulting      - Senior Network and Systems EngineerAuthor Commented:
Each hypervisor have 12x2.6 GHz and the usage is about 1100 MHz used in each one.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
CPU will not be the issue, Memory will be the issue!

So do you have enough memory for Host 2?
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sidy soumareIndependent IT Consulting      - Senior Network and Systems EngineerAuthor Commented:
host1 capacity is 140000 MB and the used is 50000 MB
host2 capacity 140000 MB and the used is 40000 MB
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You'll have no issues, currently, you have plenty of spare resources.

You will be able to demonstrate this, by putting a host into maintenance mode.
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sidy soumareIndependent IT Consulting      - Senior Network and Systems EngineerAuthor Commented:
Good
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