This behavior is expected. There are multiple background operations that VSC performs to query for updates to the vSphere inventory (e.g. VM deletion, moves, renames, etc., inactive vSphere sessions). Are you observing any problems due to this?
This is a new install of NetApp. We don't have anything on the storage yet. VSC 4.2 was installed on vCenter for performance testing right now. One thing I have noticed was, when I try accessing the VSC snap-in. It takes like 65secs to come up. That's not normal.
For us this has caused unexpected growth in our database and forces us to store gigs of unnecessary events. This should be an easily configurable feature to set polling frequency for the different plugins. We mainly use B&R and discovery on an adhoc basis so polling all the time is unnecessary.