Replying to Production agency video storage/management

For those who currently or have previously worked at a video production company, how do you manage/store footage?

My coworker and I have been quickly filling our Lacie 48tb 6big drives with footage and we're going to be in need of more space. We have a couple of avenues to aquire more space, but we would like to know how a formal production company manages their raw video footage.

We're an in-house video team, we don't have formal agency/big-budget experience. But we would like to know how a larger team deals with footage as they shoot it, manage it, and archive it.