User`s guide

2-4 StorageWorks Fibre Channel Storage Switch Sevice Guide
Isolating a System Fault
Loopback paths are built into the Switch hardware for use by diagnostics. A
loopback path test within the Switch verifies the proper internal Fibre Channel
port logic functions and the paths between the interfaces and central memory.
The Switch’s diagnostics also support external loops for testing interface cards
and their GBIC modules in cross port configurations. These port-to-port
diagnostics allow checking installed fiber cables, and provide port fault
isolation.
Removing Power
When all data-transferring processes external to the Switch are completed,
removing power from the Switch does not disrupt the Fabric.
NOTE:
Error messages are stored in RAM and are lost when power is removed from the
Switch. Access the error message log to view and note any error messages before
removing power from the Switch.
Status and Activity Indicators
The following status activity indicators apply to G_Port and FL_Port interface
cards.
NOTE:
FL_Port interface cards have an additional green LED (visible from the front of the
Switch) to distinguish them from G_Port interface cards.
Front Panel LED Power Indicator
The color and flash speed of the power LED, as described in Table 2-1,
indicates Switch status.