Sizing your ESX LUNs
I regularly get asked how LUNs should be sized for VMware..
Firstly, this is one of those ‘how long is a piece of string’ type questions.
It of course depends on the number of VMDKs you’ll be running, the storage available, the type of storage, the i/o of the storage, type of VMs etc etc etc,
Things to consider for example are, do you have storage that does de-duplication and is cost of storage a major factor (and so on)
Of course . . pretty much always, a cost savings equals a performance hit.
Anyway, as a very loose rule of thumb, I (in most cases) find that I size LUNs somewhere between 400GB and 750GB and seldom (if ever) have more than 30 vmdks per LUN.
Pretty much always, I redirect the request to the following resources:
first of all, the configuration Maximums:
and of course the composite created by Andrethegiant on the VMware communities