[cisco-voip] UCS memory sizing best practices

[Daniel Clark]

Hello folks,

We have a customer with a C220 M4S running ESXi 6.0.  It's currently
sitting at 42GB of 48GB memory utilization (87%).  We had to increase the
RAM allocated to multiple VMs when we upgraded the customer's UC
environment from 11.0 to 11.5 and 11.6.  This drove it over the 80% warning
threshold configured in our monitoring system.  This sensor is purely
looking at memory allocated versus total memory on the physical host.

The utilization has been as solid as you'd expect since the upgrade, and
there are no plans to increase utilization further, but management has
asked that we verify Cisco's best practices before we raise the monitoring
threshold to 90% to clear the warning.

Does anyone have links to Cisco (or VMWare) documentation which says
anything along the lines of, "Memory utilization on an ESXi host should not
exceed x%"?  We can open a TAC case for this if needed, but I wanted to
check if anyone had a quick reference document that my google-fu couldn't
come up with.

Thank you in advance!
Daniel
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