Mantis is a Sun Fire 280R donated by BT. It's a 4U UltraSparc box with 2GB of RAM and four 73GB drives (2xFC + 2xSCA) in RAID5.
It runs Debian GNU/Linux 5.0 (lenny).
The root partition is too large at the moment.
Mantis will become the new webserver (mara is struggling with wikis) in the next few weeks.