Hi Dario,
Here's the user breakdown for Sloan:
[External (1768) | Professor (101) | Staff (139) | Student (13323) | Pending (3) | Deactivated (1946)]
The hardware is: Sun Fire v440 with 16GB RAM, 4 CPUs.
The software is: .LRN pre-2.1, cvs tag dotlrn-2-1-0a1, with a number of bugfixes and performance tweaks, most of which have been rolled back into the .LRN cvs.