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Diagnostics 73
Loop Error Histogram Display
The Loop Error Histogram indicates errors detected on the FC-AL when a
Fibre Channel Host Controller is highlighted. Each bar represents a 3 second
period of activity. The histogram scrolls from right to left. The figure below
shows a single error period. Notice that FC-AL errors do not update the
histogram unless a Fibre Channel Host Controller is highlighted. This occurs
because the server's only view of the FC-AL is through the Fibre Channel Host
Controller, yielding no real indication of where the source of errors may be.
When errors are displayed, individual components may be disconnected from
the FC-AL to determine the failing cable, GBIC, or component. The flow
charts in the Troubleshooting Guide help you through this process.
Figure 6-16. The Loop Error Histogram, showing a single 3 second error
interval
Selecting the server causes the sum of all errors on all FC-ALs to be displayed.
Selecting a different Fibre Channel Host Controller will display the errors
associated with that FC-AL.
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