IBM DS3500 Installation, User's, And Maintenance Manual page 163

Table 6-2. Troubleshooting information (continued)
Component Problem indicator
One or more One or more green
drives LEDs off
All drives
Front panel
Some or all Intermittent or
components sporadic power loss
Drives Unable to access any
drives
Subsystem Random errors
Possible cause Possible solutions
No activity to the No action is required.
drives
No activity to the No action is required.
drives
Damaged or loose Check the SAS cables and connections.
SAS cables
ESM failure Use the controller management software to check
the drive status. Replace the ESM.
Midplane failure Contact your IBM technical-support representative.
Power supply Make sure that the cables are connected and the
power supplies are turned on.
Hardware failure If any other LEDs are lit, contact your IBM
technical-support representative.
Defective ac or dc
1. Check the ac or dc power source.
power source or
2. Secure all installed power cables and power
partially connected
supplies.
power cord
3. If applicable, check the power components
(power supplies, uninterruptible power supply,
and so on).
4. Replace defective power cables.
Power-supply Check for a fault LED on the power supply and
failure replace the failed power supply. See "Checking the
LEDs" on page 4-7.
Midplane failure Contact your IBM technical-support representative.
SAS cable
1. Make sure that the SAS cables are undamaged
and correctly connected.
2. Replace the cables.
ESM failure Contact your IBM technical-support representative.
Midplane failure Contact your IBM technical-support representative.
Chapter 6. Solving problems
6-7