Directly south of Kemper Hall lies the Campus Data Center. It houses many of the important servers used by students, staff, and faculty at UCD, basically the supporting infrastructure for the administration, while the research computers are scattered around campus. This includes the email servers, web servers, MyUCDavis, Course Management (Smartsite or Sakai), DNS, a time service, and a bunch of other services that are the core service infrastructure supporting all computing at UCD. They're a part of the Information and Educational Technology department at UC Davis. If the campus network at UCD ever goes sentient and tries to feed on the hoomans all over campus, they will likely be devoured here.
They used to house the "public" unix service and Usenet news on campus. Both of those services have been retired.
The Data Center uses approximately 350kw of power and has 90 tons of cooling to dissipate the heat load generated by the equipment inside.
Photos
Look! Wires!
I'm sure these do something important 
More wires! 
Possibly DaFIS 
They're currently transitioning away from stacking UPSes between the racks, 
OMG it's an Xserve RAID 
LTO backup tapes for disaster recovery 
Cabinets, lots of cabinets 
One of several really big air conditioners. This one provides 12 tons of cooling
