In FC you take a SCSI packet, wrap it into a FC frame (with a CRC at the end),
and then when that FC frame is put out onto the wire/fiber, it is encoded using
this 8b/10b method.
http://en.wikipedia.org/wiki/8B10B
What a invalid Tx word is when there is a 8b/10b decoding error. You'll see
these referred to as decode errors a lot of times too.
Basically the HBA received some bad data. If you monitor this count and see it
increasing by more than 1-2 an hour, you have some kind of hardware problem
between the switch serdes (serializer/deserializers which do 8b/10b work) and
the serdes on the HBA. In 99.999% of the cases where you have this count
increasing it is a bad transmitter or bad cable. If the counts are increasing I
would suggest you start by re-seating the SFP in the switch, then get a can of
compressed air and clean the cable ends and cable receptacles on the SFP and on
the HBA.
Make sure that if you are using patch panels that all those connections are
good too.
The latest generation of the 4 gig QLogic HBAs that Sun sells have diags on the
optics of the card:
SANsurfer FC HBA CLI
v1.7.0 Build 13
SFF DMI - General Menu
HBA Model QLE2460:
1: Port 1 (OS 3): WWPN: 21-00-00-E0-8B-86-02-98 Online
HBA Model QLE2460:
2: Port 1 (OS 0): WWPN: 21-00-00-E0-8B-86-3C-99 Online
3: All HBAs
4: Return to Previous Menu
Note: 0 to return to Main Menu
Enter Selection: 1
HBA 1 (OS 3): QLE2460 Port 1 WWPN: 21-00-00-E0-8B-86-02-98 Port ID: 00-00-01
------------------------------------------------------------------------------
Media Information
------------------------------------------------------------------------------
Vendor: FINISAR CORP.
Type: 400-M6-SL-I
Part Number: FTLF8524E2KNL
Speed: 100 MBytes/Sec, 200 MBytes/Sec, 400 MBytes/Sec
Revision: A
Serial Number: U8R0YCQ
------------------------------------------------------------------------------
Temperature Voltage Tx Bias Tx Power Rx Power
(C) (V) (mA) (mW) (mW)
-------------- ------- ------- -------- --------
Value 35.84 3.32 7.92 0.371 0.130
Status Normal Normal Normal Normal Normal
High Alarm 95.00 3.90 17.00 0.631 0.413
High Warning 90.00 3.70 14.00 0.631 0.261
Low Warning -20.00 2.90 2.00 0.079 0.005
Low Alarm -25.00 2.70 1.00 0.067 0.003
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