Need some clarification on the reservations of memory

After running our VMware environment a pretty ' hands-off "path, so far (based on PROD/DEV resource pools with High/Low shares but no other reservations/limits of CPU/MEM), it seems that we will have to start getting more accurate when it comes to our important VMs (problems of memory the other day affected some Windows VMs of prestige).

I'm pretty happy with memory and CPU reserves, but I want to say...

  1. If the assignment of a reserve of 3 GB memory to a 3 GB Windows VM, it will be none of this 3 GB available to other virtual machines when the virtual machine is not actively using all booking / 3GB.

  2. If the virtual machine requires all of a sudden all the 3 GB, but there is a conflict of memory on the host computer, how does ESX ensure that the / 3GB is available when virtual machine he needs?  Is the memory still allocated to the VM, but all simply not used?  Is the inflated/shared memory of guests without reservations to satisfy the requirements of the virtual machine with a reservation?  Are vmotioned VM on the host to provide the required RAM

  3. Admission control is called only when the virtual machine is running (as opposed to being rebooted)?

In short, bookings of memory will allow me to say to the owner of the application that their virtual machines are guaranteed memory resources that they need, when they need it.  I don't want to offer that and then have the roles reversed on me when it turns out that is not to be true.

Any help appreciated and I'm ready to attribute points to a helpful soul...

Jon

(1) only a reboot of the VC restarts the virtual machine world.

(2) although very unlikely - Ppossibly, sound must be incredibly bad timing, and the 2nd VM would have to have its own reserves.

The concerns you have are EXTREMELY likely if get you into such a situation, it is easy enough to temporarily disable the admission control, move the surroundings of things you must do and turn it back on.

We use bookings, while we do not encounter this.

-Matt

VCP, vExpert, Unix Geek

Tags: VMware

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