Reservations on each virtual machine

Why is it a bad idea to have reserves of CPU and memory on each virtual machine in a cluster? I'm trying to find more information. This is a good answer. I would be grateful if anyone can provide additional information on this topic.

Setting memory reservation affect the virtual machine and its surroundings. Definition of reservation by virtual computer is not recommended; It is advisable to create pools of resources instead of by M V reservations. Reservations of setting at a granular level leads to an increase in administrative costs and operational overhead. But when the situation requires to use a booking of VM, how a reservation is adjustable to ensure performance as well as possible without losing the physical memory and also less impact as possible. The answer: define a reservation equal to use memory average of VMS comments.

Pasted from <http://frankdenneman.nl/2009/12/08/impact-of-memory-reservation/>

Reservation on each machine virtual is a bad idea because you are guaranteeing resources to guest, regardless of usage.

For example. You guarantee 4 GB of RAM to a virtual computer, but using only 2 GB, 2 GB of physical RAM that could be used by other virtual machines running in this case you lose.

It's a good idea in case you know the use of the virtual machine is high and it would take resources guaranteed to continue to work effectively

Tags: VMware

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