344 IBM TotalStorage: SAN Product, Design, and Optimization Guide
An RS-232 maintenance port at the rear of the director, with port access
password-protected, enables installation or service personnel to change the
director’s internet protocol (IP) address, subnet mask, and gateway address.
Service personnel can also run diagnostics and isolate system problems
through a local or remote terminal.
Redundant FRUs (logic cards, power supplies, and cooling fans) can be
removed or replaced without disrupting director or Fibre Channel link
operation.
A modular design enables quick removal and replacement of FRUs without
the use of special tools or equipment.
Concurrent port maintenance means UPM cards can be added or replaced
and fiber-opt ...