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The case of the missing CPU affinity button October 1, 2012

Posted by vbry21 in VMware blogs.
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I had an interesting failure on the course this week whilst testing the VMware Update Manager lab, the ‘Putting Server into Maintenance Mode” failed.

 

We immediately suspected that a VM still had a CPU affinity set.

 

We right clicked the VM > Edit Settings > Resources Tab, but we couldn’t find the CPU affinity option under advanced CPU.

 

The reason was as follows.

 

When the Lab Cluster was enabled for DRS, it disables the ability to set CPU affinities on the VMs, this makes sense, the reason being that one of the functions of DRS is to enable the VMs to automatically load balance, if a CPU affinity is set, the VM cannot load balance.

 

The fix therefore was to temporarily disable DRS on the cluster, go into the VM settings, remove the CPU affinity, the Advanced CPU option on the resources tab of the VM magically appeared.

 

DRS on the cluster was re-enabled and the lab worked a treat

 

 

 

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