Correcting I2C Bus Errors - HP A7533A - Brocade 4Gb SAN Switch Base Administrator's Manual

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Correcting I C bus errors
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I C bus errors generally indicate defective hardware or poorly seated devices or blades; the specific item
is listed in the error message. See the Fabric OS Command Reference for information specific to the error
that was received. Some Chip-Port (CPT) and Environmental Monitor (EM) messages contain I
information.
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If the I C message does not indicate the specific hardware that may be failing, begin debugging the
hardware, as this is the most likely cause. The next sections provide procedures for debugging the
hardware.
To check fan components:
1. Log in to the switch as user.
2. Enter the fanShow command.
3. Check the fan status and speed output.
If any of the fan speeds display abnormal RPMs, replace the fan. You may first consider re-seating the fan
(unplug it and plug it back in).
To check the switch temperature:
Log in to the switch as user.
1.
2. Enter the tempShow command.
3. Check the temperature output.
Look for indications of high or low temperatures.
To check the power supply:
1. Log in to the switch as user.
2. Enter the psShow command.
3. Check the power supply status. Refer to the appropriate hardware reference manual for details
regarding the power supply status.
If any of the power supplies show a status other than OK, consider replacing the power supply as soon
as possible.
To check the temperature, fan, and power supply:
1. Log in to the switch as user.
2. Enter the sensorShow command. See the Fabric OS Command Reference for details regarding the
sensor numbers.
3. Check the temperature output.
Look for indications of high or low temperatures.
4. Check the fan speed output.
If any of the fan speeds display abnormal RPMs, replace the fan FRU.
5. Check the power supply status.
If any power supplies show a status other than OK, consider replacing the power supply as soon as
possible.
312 Troubleshooting
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C-related