Rack Diagram (BlockDiag)

RackDiag (part of Blockdiag) lets you describe the physical layout of equipment in server racks as text, and automatically renders them as rack elevation diagrams - the kind you'd see in data centre documentation.

rackdiag {
  8U;
  1: UPS [2U];
  3: DB Server;
  4: Web Server;
  5: Web Server;
  6: Web Server;
  7: Load Balancer;
  8: L3 Switch;
}