FW 07.00.00/HAFM SW 08.06.00 McDATA Sphereon 4500 Fabric Switch Installation and Service Manual (620-000159-320, April 2005)

Diagnostics
4-25
Troubleshooting Tip for
Port Statistics
As a general rule, you should clear all the counters by selecting Clear
Port Stats or Clear All Port Stats after you have resolved a problem.
When troubleshooting, keep track of the time interval when errors
accumulate to judge the presence and severity of a problem. (There is
a link recovery hierarchy implemented in Fibre Channel to handle
some level of “expected anomalies”.) For troubleshooting purposes,
you want to focus on when the errors, as displayed in the Counter
column, increment very quickly.
Parts of Statistics
Tables
The tables of statistics contain the following columns:
• Statistics - the type of statistic being tracked.
• # of Wraps - times the Counter value wraps, for statistics that
grow rapidly. The maximum value that either the Counter or the
#ofWraps can hold is 2
32
, or 4,294,967,296. Each time the Counter
field reaches the maximum value of 2
32
, the wrap count is
incremented by 1.
• Counter - the number of instances of the tracked item recorded
since system initialization or the last time the counters were
cleared.
Traffic Transmit and
Receive Statistics
The Traffic Statistics include these transmit and receive values.
•Frames Rx - The number of frames that the port has received.
• Frames Tx - The number of frames that the port has transmitted.
• Four byte words Rx - The number of words that the port has
received.
• Four byte words Tx - The number of words that the port has
transmitted.
• Offline sequences Rx - The number of offline sequences (OLS)
received by this port.
• Offline sequences Tx - The number of offline sequences (OLS)
transmitted by this port.
• Link resets Rx - The number of link reset protocol frames
received by this port from the attached N_Port.
• Link resets Tx - The number of link reset protocol frames
transmitted by this port to the attached N_Port.