HP 2120 HP StorageWorks Disk System 2120 Users Guide (5697-5367, March 2005) - Page 30

30 HP StorageWorks Disk System 2120 Isolating Faults Table 7 lists the probable causes and solutions for problems you may detect on the disk system. When more than one problem describes your situation, investigate the first solution that applies. The table lists the most basic problems first and excludes them from subsequent problem descriptions. Erratic LED behavior on the disk system could be observed in the following situations: ■ When a server that is connected to a Disk System 2120 is powered down or loses power (and the disk system remains powered on) ■ When the disk system is powered up when connected to a downed server ■ When an unconnected disk system is powered up An example of this LED behavior is the LEDs staying lit solidly. This condition is caused by the disk system being deprived of term power when the server loses power or is powered down. The disk system does not provide its own term power. It relies on the host bus adapter to which it is connected for term power. TABLE 7 Troubleshooting Table Problem LED Description State Probable Cause Disk system fails to power on when installed System power LED is off Power cord is not plugged in. The power button is not pressed. AC breaker is tripped or AC power source has failed. The PDU/PDRU is defective. Enclosure chassis is faulty. Operating system reports errors on a device System power LED is blinking Power supply is defective. Cooling fans are not spinning at the correct speed. Disk module LED is on solid or off Use diagnostic utilities to determine disk status. Solution Plug in the power cord. Press the power button. Confirm AC power availability. Replace the PDU/ PDRU. Replace the enclosure chassis. Replace the enclosure chassis. Replace the enclosure chassis. Depending on the results, monitor or replace disk module.