HP AA979A - StorageWorks SAN Switch 2/8V, Administrator'S Manual, Page: 304 / 465

316 Troubleshooting
Correcting I
2
C bus errors
I
2
C bus errors generally indicate defective hardware or poorly seated devices or blades; the specific item
is listed in the error message. Refer to the Fabric OS System Error Message Reference Manual for
information specific to the error that was received. Some CPT and Environmental Monitor (EM) messages
contain I
2
C-related information.
If the I
2
C message does not indicate the specific hardware that might 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 FRU. You might first consider re-seating
the fan FRU (unplug it and plug it back in).
To check the switch temperature
1. Log in to the switch as
user
.
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. Refer to the Fabric OS Command Reference Manual 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 of the power supplies show a status other than OK, consider replacing the power supply as soon
as possible.