Compaq StorageWorks Fibre Channel Troubleshooting Guide

Fibre Channel Fault Isolation Utility 2-5
Display of a FC-AL with a Missing Fibre Channel Tape Controller
The figure below shows a Fibre Channel Host Bus Adapter highlighted with a Fibre Channel
Tape Controller missing. This indicates that while the Tape Controller has become inactive on
the FC-AL since the utility was started. This could mean that it has been physically
disconnected or that errors are occurring on the FC-AL at a great enough frequency to prevent
the device from maintaining login.
If there are a large number of errors occurring in the FC-AL, the Fibre Channel Host Bus
Adapter may not be able to communicate with the Fibre Channel Tape Controllers on the
FC-AL. In this case, the Fibre Channel Controllers may appear to be offline in the program,
although in reality they are physically connected to the FC-AL. When a FC-AL shows errors,
the Fibre Channel Array and Tape Controllers may alternate between being logged-on the
FC-AL or missing.
Figure 2-4. Display of a FC-AL with two Fibre Channel Tape Controllers shown as missing