IBM totalstorage 326, User Reference

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Table 22. Storage unit troubleshooting table (continued)
Problem Indicator Component Possible Cause Possible Solutions
Intermittent or
sporadic power loss to
the expansion unit Some or all CRUs Defective AC
power source or
partially plugged
in power cord
1. Check the AC power
source.
2. Reseat all installed
power cables and power
supplies.
3. If applicable, check the
power components
(power units, UPS, and
so on).
4. Replace defective power
cords.
Power supply
failure Check for a Fault LED on
the power supply and
replace the failed CRU.
Midplane failure Have the midplane replaced
(service technician only).
Unable to access
drives Drives and FC
loop Incorrect ID
settings
1. Ensure that the FC
optical cables are
undamaged and
properly connected.
2. Check the drive ID
settings.
Note: Change switch
position only when the
expansion unit is powered
off.
ESM board failure Have one or both ESM
boards replaced.
Random errors Subsystem Midplane failure Have the midplane replaced
(service technician only).
Note: If you cannot find the problem in the troubleshooting table, test the entire
system. See your storage unit documentation for more detailed information
on testing and diagnostic tools.
Chapter 8. Troubleshooting
121