World's Five Biggest SANs
I know it's not a PB but here at the Census we have one 150TB array thats used for one project and not 170K employees.
It is interesting when you get in storage of this size. I remember sitting in a meeting where we discussed a storage cabinet we were ordering. The RAW size of the cabinet was 150TB but formatted it would be 100TB ... 50TB is a lot of storage to "throw away" for redundancy / formatting! Considering at this price your paying about $10k+ a TB (With staff and infrastructure costs fractured in)!