Resource pool reservation/expandable reservation

Essendon

I have 24GB of RAM available at the cluster level (there are 3 hosts). I created two resource pools and called them Development_VMs and Production VM's. See screenshot for settings.



Note how Expandable Reservation is enabled. I understand that this is to satisfy virtual machine-level reservation set within the resource pool. Questions:

1. How is the used reservation = 576MB? I added up the virtual machine overhead memory and it comes to 300MB, there is no reservation set at the VM level so how is it 576MB? Is it some other kind of overhead?

2. I realize I have Expandable Reservation enabled, how did it calculate that the available reservation is 9341 MB? I have 24GB RAM at the cluster level and the other pool (Development_VMs) has the following config:



So I guess the question is how it arrived at 9341 MB? Configured RAM on each VM is (AppVM2 = 256MB, Dummy = 4GB, VM1 = 256MB and VM2 = 4GB)

Thanks!

dave330i

Essendon wrote: »

I have 24GB of RAM available at the cluster level (there are 3 hosts). I created two resource pools and called them Development_VMs and Production VM's. See screenshot for settings.



Note how Expandable Reservation is enabled. I understand that this is to satisfy virtual machine-level reservation set within the resource pool. Questions:

1. How is the used reservation = 576MB? I added up the virtual machine overhead memory and it comes to 300MB, there is no reservation set at the VM level so how is it 576MB? Is it some other kind of overhead?

2. I realize I have Expandable Reservation enabled, how did it calculate that the available reservation is 9341 MB? I have 24GB RAM at the cluster level and the other pool (Development_VMs) has the following config:



So I guess the question is how it arrived at 9341 MB? Configured RAM on each VM is (AppVM2 = 256MB, Dummy = 4GB, VM1 = 256MB and VM2 = 4GB)

Thanks!

Expandable reservation allows the resource pool to borrow resource from the parent cluster/resource pool. As for the 576 MB resource used, did you add the CPU & memory overhead?

Essendon

I know it borrows from its ancestor, but how did it arrive at that figure?

That might be it but how do I find out the CPU overhead?

dave330i

My bad. For some reason I thought vCenter reported CPU & RAM overhead seperately.

Essendon

Bumping this up guys.

jibbajabba

Check the overhead reservation

VM > Resource Allocation > Overhead Reservation