Host Demand isn't the sum of VM Demand : Why ?

[david_loup]

Hello,

In the tab "operation - Detail" with a host selected, can someone explain me the differences between the "host demand" and the "Virtual Machines Demand" ?

I don't get why the sum of the VM demand isn't equal to the host demand (no even close !)

Here's a screenshot that illustrate my question : http://s30.postimg.org/5vkh4zx41/Host_vs_VM_Demand.jpg

Thank you.

[gradinka]

Hm, is it possible that you have other VMs on that host which are not being monitored?

Or maybe some FT operations going on? (guessing here)

[david_loup]

Thank you for responding so quickly,

  I checked : All my VMs are being monitored by Vcops.

Does memory reservation affects the host demand ?

Edit : I have the same issue with the free version of Vcops monitoring another Vcenter.

I don't understand why I have this problem only for memory : http://s30.postimg.org/62vnv0qv5/Host_vs_VM_Demand_1.jpg

As you can see, the host demand for CPU is the sum of the VM CPU demand. But for memory, there is this problem.

I though memory reservation wasn't supposed to have an impact on demand, but when I lowered reservation on some VM, it lowered memory demand on the host.

Any idea of what can cause this difference between host and VM demand ?

[mark_j]

This demand on this host is reflecting system usage due to, very possibly, your reservations. Regardless of what cap/plan model your using, demand or allocation, reservations are ALWAYS taken in to consideration.