Hi all,
So I thought I understood the admission control policy but clearly not, can someone please help me understand why the below configuration is erroring with insufficient resources available when replicating a host failure.
I have the following setup
2 x v5.5 ESXi Hosts each with 16GB memory and 12 x 2.493GHz CPU's (29.9 GHz)
4 x win2008 machines with 1 vCPU and 2048MB memory each, no reservations have been set.
I'm using percentage based admission control policy and I have it set to 10% for both CPU and memory.
So
Total memory = 32GB
Total CPU = 59GHz
4 x 2008 servers totaling 4 vcpu & 8192MB memory (no reservations)
admission control set at 10 % for both cpu and memory
If i place one of the hosts into maintenance mode i get the error insufficient resources available, please help me understand why?
From my understanding.
Percentage based policy works off reservations set and because i have no reservation on any of the VM's only overhead is considered, therefore I believe the percentage is calculated using the following
(Memory reservation + memory overhead)
Default CPU which is 32MHz
I've calculated it as,
Memory = (32 - (VM1 = 0+100) + (VM2 = 0+100) + (VM3 = 0+100) + (VM4 = 0+100)) / 32 * 100 = 98% - 10% = 88% available after deducing 10% allocated to admission control.
CPU = (59 - (VM1 = 32) + (VM2 = 32) + (VM3 = 32) + (VM4 = 32)) / 59 * 100 = 99% - 10% = 89% available after deducing 10% allocated to admission control.
Thanks