I currently have a two node cluster. Each node is identical. Each host has 128GB of memory and an 8 core CPU running at 2.1Ghz.
I have HA enabled on the cluster with admission Control as follows:
So I can tolerate one node failing (50%).
If this is the case then why do the vSphere HA numbers show 96% free for CPU fail over reserves currently available (not in use) and 99% memory fail over reserves currently available (not in use):
Shouldn't the blue bar in the above screenshot show a higher utilisation for memory considering I am using 106GB currently? Same for CPU?
My cluster utilisation at the time of taking the above screenshots is as follows:
.
The other thing I don't understand is, why do I get the following message sometimes after rebooting vCenter:
Usually my memory usage is way under 128GB of RAM so I should have sufficient resources to tolerate a host failure and yet I get the above warning in vCenter and I'm not sure why? The only way I have found to get rid of this warning is to disable HA and re-enable. I'm not sure if this is the correct thing to do?
I'm running vSphere 6.5 Update 1.
Thanks!
