Resource Allocation and used

[vivath]

Hi guy,

I have two ESXi hosts with memory 100 GB for each.

I put them into cluster, so I have 200GB as cluster pool.

I enable HA feature on that cluster.

I remove admission control on the cluster.

I provision one VM with spec of memory 150GB. and the current used memory of the VM is just only 50GB. (Allocation: 150GB, Used: 50GB).

my problem is:

if one of my host down, can my VM restart and run on another host?

Thank you for your comment.

[rcporto · Accepted solution]

First, take in mind that a virtual machine uses CPU and memory resources only from the host where the virtual machine is running. You're able to assign more than 100GB for a single virtual machine due to memory overcommitment technologies. So, depending of the load in your ESXi hosts, if one host fail, that virtual machine can restart on the another host. But again, it will depends of the load on the other host. If you're running just a single virtual machine I believe that it will restart on the another host without problem.

[vivath]

rcportoHi Richardson Porto,

If admission control is enabled, the allocation over commitment is disable. is it correct?

and it will restrict both CPU and memory or memory only?

example, two hosts with 100GB of memory for each, => total resource 200GB in cluster pool. if admission control enabled with 50% Guaranty => resource available only 100GB.

so Can I assign resource to my VM over 100GB (allocated resource)?

Thank you.

[rcporto]

Admission control do not disable overcommitment unless you're using reservations.