HP Surestore Disk Array 12h HP SureStore E Disk Array 12H User's and Service M - Page 252
Troubleshooting, LEDs on the front of the fan assembly. If a failure occurs
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Appendix D. Back-to-Back Racking Troubleshooting Troubleshooting A computer/instrument rack which has been field-upgraded for back-to-back racking has improved cooling and power features. In addition, the upgrade (the exhaust fan assembly) provides circuitry which can report fan failures and provide an indication of power failures. Fan and power failures are reported via indicator LEDs on the front of the fan assembly. If a failure occurs, the rack will continue to operate with its remaining non-failed components. To isolate a possible power or fan failure, use one of the following procedures, based on the status of the indicator LEDs. NOTE The two exhaust fan assembly power cables need to be connected into two separate PDUs, such as PDU #1 and PDU #2. The new PDUs installed from the power upgrade kit are not wired through the rack power switch. The rack power switch, at the top of the rack, is disconnected and no longer provides power switching. To disconnect power to the rack you must unplug each of the three PDUs. 252 Racking