IBM System Storage EXP2512 Express Storage Enclosure Installation, User's, And Maintenance Manual page 54

Table 6. Troubleshooting information (continued)
Component Problem indicator
One or more hard One or more green
disk drives LEDs off
All hard disk
drives
Front panel
Some or all Intermittent or
components sporadic power loss to
the EXP2500
Drives Unable to access any
drives
Subsystem Random errors
42
System Storage EXP2512 and EXP2524: Installation and Maintenance Guide
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 RAID controller management software to
check the drive status. Replace the ESM. See
"Replacing an ESM" on page 35.
Midplane failure Have the EXP2500 serviced.
Power supply Make sure that the cables are connected and the
power supplies are turned on.
Hardware failure If any other LEDs are lit, have the EXP2500
serviced.
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 "Replacing a
hot-swap power supply" on page 36.
Midplane failure Have the EXP2500 serviced.
SAS cable
1. Make sure that the SAS cables are undamaged
and correctly connected.
2. Replace the cables.
ESM failure Have the EXP2500 serviced.
Midplane failure Have the EXP2500 serviced.