What is the exact use of VM==>Edit Settings==>Resources==>CPU(Reservation,Limit and Unlimited) options?

[ViswanathAngaja]

Hi All,

Can anybody please explain what is the use of (Reservation, Limit and Unlimited) option provided in the VM resource allocation settinngs?

I want to know about these proeprties and why they are used for? Exact answer will me appreciable.

Thanks in Advance !!

Viswanath

[Gav0]

Regardless of the amount of resource (CPU/RAM etc) that the VM thinks it has when its booting up (IE what it has been configured for) you can customise exactly how much the host or resource group will actually grant it.

Take RAM for example.  you have a VM with 4gb allocated, when it boots up it will do its POST etc and think it has 4gb ram.  you can then throttle or guarentee this amount using Resource Allocation.

LIMIT: you are not having 4gb of RAM, im only going to let you have 1GB

UNLIMITED: you can have your 4GB as long as there is enough available on the host/resource pool

RESERVATION:  Im going to reserve x amount of RAM just for, other VM's cant use it

works the same way for CPU

[MauroBonder · Accepted solution]

might this guide can help to understand http://www.vmware.com/pdf/vsphere4/r40/vsp_40_resource_mgmt.pdf

http://vmzare.wordpress.com/2007/02/27/sharesreservationlimits-cpumemory-resource-settings/

Please, don't forget the awarding points for "helpful" and/or "correct" answers.

Mauro Bonder - Moderator

[ViswanathAngaja]

Thanks to all.