Table 16. Troubleshooting (continued)
Problem indicator Component Possible cause Possible solutions
Intermittent or
sporadic power
loss to the storage
subsystem
Some or all
components
Defective power
source or
incorrectly
connected power
cable
Check the ac or dc power source.
Reseat all installed power cables
and power supplies. If
applicable, check the power
components (power supplies or
uninterruptible power supply).
Replace defective power cables.
Power supply
failure
Check the fault LED on the
power supply. If the LED is lit,
replace the failed component.
Faulty disconnect
device
Check and install a new 20 A
rated disconnect device.
Midplane failure Replace the DS3500. Contact
your IBM technical-support
representative.
Unable to access
drives
Drives Incorrect storage
subsystem ID
settings
Ensure that the SAS cables are
undamaged and correctly
connected. Check the storage
subsystem ID settings.
controller failure Replace one or both controllers.
Contact an IBM technical-support
representative.
Drive failure Replace the failed drive or
drives.
Random errors Subsystem Midplane failure Replace the DS3500. Contact
your IBM technical-support
representative.
166 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide