IBM DS3500 Installation, User's, And Maintenance Manual page 161

Table 6-1. Troubleshooting (continued)
Problem indicator
Intermittent or sporadic
power loss to the
storage subsystem
Unable to access drives Drives
Random errors
drive is not visible in
the Storage Manager
software
Storage enclosure is not
detected
Component Possible cause
Some or all Defective power source
components or incorrectly connected
power cable
Power supply failure
Faulty disconnect device
Midplane failure
Incorrect storage
subsystem ID settings
controller failure
Drive failure
Subsystem Midplane failure
Several components Drive failure
SAS cable failed
controller failure
Midplane failure
A drive has an interface
problem with the ESM or
controller.
Incorrect firmware
version
In a dual-controller
storage subsystem, one
controller has failed, and
in the drive channel that
originates from the other
(functioning) controller,
an ESM has failed.
Storage subsystem storage enclosure is not
supported
SAS cable failed
Possible solutions
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.
Check the fault LED on the power supply.
If the LED is lit, replace the failed
component.
Check and install a new 20 A rated
disconnect device.
Replace the DS3500. Contact your IBM
technical-support representative.
Make sure that the SAS cables are
undamaged and correctly connected.
Check the storage subsystem ID settings.
Replace one or both controllers. Contact an
IBM technical-support representative.
Replace the failed drive or drives.
Replace the DS3500. Contact your IBM
technical-support representative.
Replace the failed drive or drives.
Replace the SAS cable.
Replace controller. See Chapter 5,
"Replacing components," on page 5-1 for
more information.
Replace the DS3500. Contact your IBM
technical-support representative.
Replace the drive. See Chapter 5,
"Replacing components," on page 5-1 for
more information.
Make sure that the DS3500 has the correct
firmware version. See "Software and
hardware compatibility and upgrades" on
page 1-14.
Replace the failed controller and ESM. See
Chapter 5, "Replacing components," on
page 5-1 for more information.
Verify that the storage enclosure is
supported by the DS3500 storage
subsystem.
Replace the SAS cable.
Chapter 6. Solving problems
6-5