This is very small question, but i want to know this information.
In same time how many Virtual Machines will do for the VMotion...
There is a setting someplace, dont remember where, but the default is 2 per host / 2 per LUN / 2 per data center at once.
So if you have 4 vmotion, and more than 2 of those are on a host / LUN / data center, the others will be suspended until they complete.. but like I said there are settings where you can change this, it's just using defaults.
I believe those numbers are accurate, at least they were for 4.1