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ESXi 5.0 Resource Pools

compdigit44 asked
Last Modified: 2012-02-17
I have a ESXi 5.0 server with 128GB of Ram and local storage. The server has 13 VM's range from 4GB of Ram to 20GB (Please note 4 of the VM's are using 20GB). Only one VM has a 1GB reservation. I was suprised to see that my VM through a host memory alarm early today and that 90% of my host memory was in use. When I looked at the resource allocations the guest VM's memory usage was very low but the host memory usage on the at least 4 VM's was high.

I have three resource pools in place.
high - no reservation
normal - 900mb
low - 300mb

Is it possible to have to many resource pools which could cause resource problems
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Top Expert 2010

May I ask why you're using RPs? Do you have SLAs in place for guaranteed resource allocation to your VMs?

vSphere does a great job on its own of allocating resources where needed to VMs that may need it (in contention). Unless you have an org/departmental need to segregate resources I recommend against using RPs. You can run into issues with resources as well create an extra layer of administration overhead that may not be needed.

Top Expert 2010

And yes, if you don't understand RPs, you can run the risk of not having enough resources in a RP for your VMs to run, or run with optimal performance...
Top Expert 2010

I recommend looking through the Res Mgmt Guide, beginning on pg. 47 for more on RPs:


Thanks for the reply. The reason why I want to use RP to to allow VM that were more important to have access to resource when durning higher processing times....I created the RP's to help avoid resource problems. Which is why I'm comfused as to why my memory was so high. Once I removed two of my resource pools memory usage on the host when down.. I haven't read the PDF yet but could you give me a nut shell explaination in the mean time
Top Expert 2010
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