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HA VM failover question

Posted on 2013-05-13
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Last Modified: 2013-05-13
I have a HA setup with 4 blades (hosts) right now.

I have 1 VM (Called VM A) on one blade that uses a lot of resources.

None of the other hosts (blades) in the cluster have available resources matching what VM A uses

So my question is this, if VM A has to fail over will it still fail over to another host but run with limited resources or will it just not fail over?
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Question by:iamuser
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by:Andrew Hancock (VMware vExpert / EE MVE)
Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 39161997
By Default it WILL NOT Fail-Over, unless you change the Cluster HA Settings, otherwise you will get an error message, stating not enough resources.

if you want to failover, but with klimited resources

Disable vSphere HA admission control.

you will receive the following error message

Insufficient resources to satisfy HA failover level on cluster

see here

http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.avail.doc_50%2FGUID-53F6938C-96E5-4F67-9A6E-479F5A894571.html

http://www.yellow-bricks.com/2012/12/04/insufficient-resources-to-satisfy-ha-failover-level-on-cluster/
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by:iamuser
ID: 39162008
so if i change the cluster HA settings the VM will failover but just run slower
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Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 39162017
Correct.

but be careful, and use common sense, if you have a VM which requires 64GB of memory, and your host only has 8GB, it will run very very slowly! (and probably fail!)

Ideally all hosts would be roughly equal!
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by:iamuser
ID: 39162127
great thanks for the clarification
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LVL 118
ID: 39162353
No problems!
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