HA and affinity rules & book by Duncan & Frank

VMware vSphere reading 5 clusters of Duncan & Frank (Pocket v1.0) deepdive, I'm confused.

On page 212, second paragraph, it says (roughly) VMware HA is not aware of the virtual-VM anti machine affinity rules, and after an HA event may begin on the same host. But on page 215, second paragraph, it says (roughly) HA will not violate the mandatory rules after HA failover.

This seems to contradict itself.

I can not type the full section due to copyright.

Is anyone able to explain it?

See you soon.

Hello

There are two types of rules:

  1. VM - VM affinity rules
  2. VM - host affinity rules

HA is not aware of the first, machine virtual-VM, so any rule you create here will be ignored by HA.

Now, for the second, it's a bit more complicated... There are two types of VM - affinity host rules:

  1. Bride aka mandatory
  2. Expected preferential aka

HA will respect 'must' of the rules, but will be no respect for the rules 'should '.

That's what means the book.

Tags: VMware

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    Unfortunately, as you use vSphere4.1, you're out of look about the DRS control over an HA event, it's a feature of 5.x

    If you do a manual vMotion then you are effectively denying your rules of affinity of DRS, until she physically check the rule during the migration.  It's as good as it gets.

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