You can use these charts to find solutions to problems that have definite
symptoms.
| Problem indicator | Component | Possible cause | Possible solutions |
|---|---|---|---|
| Amber LED on | Drive CRU | Drive failure | Replace the failed drive. See "Replacing hot-swap drives". |
| ESM board | Board failure | Replace failed board. See "Replacing an ESM board". | |
| Front panel | General machine fault | Indicates that a Fault LED somewhere on the storage unit has been turned on. Check for amber LEDs and CRUs, Refer to "Rear controls, indicators, and connectors" | |
| Amber LED on and green LED off | Power-supply CRUs | Power is turned off | Turn on all power supplies. See "Rear controls, indicators, and connectors". |
| Amber and green LEDs on | Power-supply CRUs | Power supply failure | Replace the failed power supply CRU. See "Replacing an ESM board". |
| All green LEDs off | All CRUs | The storage unit is turned off | Check that all storage unit power cables are plugged in and the power is
on. If applicable, check that the main circuit breakers for the rack
are turned on.
If the external switch 1 is set to Off, the SCSI controller must be cabled to the storage unit and turned on. See "External option switches". |
| AC power failure | Check the main circuit breaker and ac outlet. | ||
| Power supply failed | Replace the power supply CRU. See "Removing a hot-swap power supply/fan unit". | ||
| Midplane failure | Have the storage unit serviced. | ||
| Amber LED flashing | Drive CRUs | Drive rebuild or identity is in process | No corrective action is needed. |
| Power supply CRU | Fan failure | Replace the power supply CRU. | |
| Amber LED on and green dc power LED off | Power supply CRU | Power supply failure | If the power switch is on, replace the power supply CRU. See "Removing a hot-swap power supply/fan unit". |
| Amber LED on and green ac power LED off | Power supply CRU | No ac power to power supply. Check the ac power cord (cable) or breaker | If ac power is good at the source, replace the power cord CRU. If the power supply has failed, replace the power supply CRU. See"Removing a hot-swap power supply/fan unit". |
| Green LED on | Drive CRU ID=6 | Cluster configuration | If not currently cluster configured, power cycle the storage unit to re-enable ID=6. |
| One or more green LEDs off | One or two drive CRUs | No activity to the drives | No action is required. |
| All drive CRUs or those on one bus | No activity to the drives | No action is required. | |
| Damaged or loose SCSI cables | Check SCSI-bus cables and connections. | ||
| ESM board failure | Use RAID management software to check the SCSI-bus status. Replace the ESM board. See"Replacing an ESM board". | ||
| Midplane failure | Have the storage unit serviced. | ||
| Front panel | Power supply | Make sure the cables are plugged in and power supplies are turned on. | |
| Hardware failure | If any other LEDs are turned on, have the storage unit serviced. | ||
| Intermittent or sporadic power loss to the storage unit | Some or all CRUs | Defective ac power source or partially plugged power cable | Check the ac power source. Resecure all installed power cables and power supplies. If applicable, check the power components (power units, UPS, and so on). Replace defective power cables. |
| Power supply failure | Check for a fault LED on the power supply and replace the failed CRU. See"Installing a hot-swap power supply/fan unit". | ||
| Midplane failure | Have the storage unit serviced. | ||
| Unable to access drives on one or both SCSI buses | Drives and SCSI bus | Incorrect SCSI ID settings | Make sure SCSI cables are undamaged and properly connected. Check
the drive SCSI ID settings. Ensure that option switches 1 and 3 (inside
the switch card) are set to the appropriate positions.
Attention: Change switch positions only when your host server and storage unit is turned off. |
| ESM board failure | Have the storage unit serviced. | ||
| Bridge card | Bridge card failure | All high address or all low address hard-disk drive failed; check the bridge card CRU and replace if necessary. See "Replacing a bridge card". | |
| Random errors | Subsystem | Midplane failure | Have the storage unit serviced. |
If you already have run the server test program, or if running the test does not reveal the problem, have the system serviced.