Maximum recommended Memory Utilization for ESXi

[TheVMinator]

What is the maximum percentage utilization I should allow on an ESXi host?  80%? 90?

I thinking in this case that if I need to move VMs onto a host temporariliy for 30 mins or so during a maintenance event, what is the percentage memory utilization I shoud stay under for a single ESXi host?

[JeffInouye]

I always try to stay under a peak usage of 90% in order to avoid too much ballooning or swapping to disk.  you can monitor the statistics as you go to make sure you aren't swapping too much.  In most cases as long as you have vmware tools installed with the balloon driver, this will help the situation out.

Be aware that this 90% threshold I go by is for larger ESXi hosts with 256GB of RAM or more.  When you start dealing with lower RAM capacities in a host, you have to be aware of the reserved space for vmkernel, as well as overheard for the virtual machines as you migrate them.

[admin]

when you will see in the vcenter default configuration its its its showing 85% to 95%  also you can check and will get ur question ans checking default memory alarm ..where vmware defined default value for alarm in definition tab..

Yours, Phillips