is the pooling of vRAM entitlements limited to a single vCenter instance, I mean - if you have multiple vCenter instances, does that mean that you also have multiple vRAM pools?
Or is the licensing component in vSphere 5 now able to be used by multiple vCenter instances?
What about linked mode?
This might relax people that maybe have a legacy farm with 2- to 4-core-CPUs and not-so-much-RAM per CPU on the one side (with a plenty of unused vRAM entitlements), and another modern farm with 6- to 12-core CPUs and 128GB+ RAM per CPU (with the desperate need for more vRAM entitlements) on the other side ...
Yes, but think of a situation where you don't want to use linked mode, but have several separated installations - maybe in a multi-national enterprise - that are also managed by different entities and people...
In such a situation it would be good to either
a) have a globally usable licensing service with CPU and vRAM entitlement pooled all over the enterprise, or at least:
b) to be legally entitled to over-subscribe vRAM-entitlements in one environment if you under-utilize the pool of another environment to the same amount (Practically this can easily be possible, because vRAM pool entitlements are not technically enforced).
Probably, only a VMware guy can answer this question, but it's an important one for large enterprises.