Question of DRS HA and fully automated

I have a vCenter enabled for HA cluster (tolerates 1 default host) and DRS (fully automatic)

Most of my VM have 2 or 4 GB of memory. Now, I need to create a virtual machine with 32 GB of memory.

If the DRS load balances my cluster there will be no host monkey with 32 GB of memory available even if the cluster has more than 32 GB of memory available.

My question is (without entering the calculation of the size of opening calculation etc.) if the host where the 32 GB VM fails and HA restarts the virtual machine on the remaining hosts, DRS balance the cluster to allow the 32 GB VM to start?

In vSphere 4.1 and later, HA works with DRS "defragment" hosts so that your large VM can be restarted. It is a kind of best effort of activity and is not guaranteed to work. I'm not aware of what is true in 4.0.

For more details, I suggest the post of Duncan Epping on the subject, start by "how HA to calculate how many slots is available for each host?

http://www.yellow-bricks.com/VMware-high-availability-deepdiv/

Tags: VMware

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