Resilient?
Transporter 15 with 8TB capacity (6TB usable), 15 users
Transporter 30 - 12TB (9TB usable), 30 users
Transporter 75 - 12TB (10 usable), 75 users
Transporter 150 - 24TB (20TB usable) and, you guessed it, 150 users
Presumably this means they're RAID5 devices:
4x2TB
4x3TB
5x2TB
6x4TB
respectively?