Should I upgrade from ESXi 4.0 to ESXi 6.0?

Question

VMware

Hardware: Dell PE R610,
2 x Xeon E5530 2.4 GHz
4 x SAS 146GB
RAM 16 GB.

The main question: Will productivity fall?

Answer 1

It's worth updating.
Productivity will not fall, but only increase. In addition, old bugs will be fixed and new features added. I myself have one server on 6.0 in production, it works fine.
On ESXi 5.5, there were several small but unpleasant jambs, which were solved only by updating to 6.0
. Since you have a single server, you should not worry at all. It is difficult to update the entire infrastructure with hundreds of virtual machines, but you can do one server in an evening.