OK, so it sounds like using the default setting of 0MB means it can essentially share at any time? So I would have to push that reservation to what the actual RAM I've assigned to the VM if I don't want this to happen? I assume since we're over built on RAM compared to actual usage, this isn't happening much.
As far as ballooning, I did not realize that, although I don't ever see any ballooning, I think again due to the fact we're over built on our hosts for RAM.
So it sounds like there is NO way to disable either of these from happening globally, I would actually have to visit each VM's settings and VMware Tools config?