HP Surestore Disk Array FC60 HP SureStore E Disk Array 12H User's and Service - Page 255

Appendix D. Back-to-Back Racking Problem Resolution Problem Resolution No LEDs lit All power to the fan assembly has failed. This is an indication the two of the PDUs and possibly the third are not supplying power to the arrays, thus indicating that none of the array enclosures are operating. This could be caused by a general power failure at the site, tripped circuit breakers for the circuits delivering power to the rack, or unplugged power cables. If these are not the causes, problem diagnosis of the rack is as follows: 1. Are the PDU circuit breakers tripped? Check the PDU circuit breakers. The PDUs are located at the back of the rack. The circuit breakers are black buttons located at the bottom of each PDU. When a circuit breaker is tripped, the black buttons will be popped out. Locate and remove the cause of any overload. Reset the circuit breaker by pushing in on the black buttons. 2. Are both plugs of the exhaust fan assembly plugged in? Although unlikely, it is possible that the exhaust fan assembly is not plugged in. If necessary, plug the exhaust fan assembly power cords into their receptacles. CAUTION! This condition is critical, as the fans are not cooling the disk storage units in the rack, and disk drive reliability may be compromised. When the power fail condition is corrected, both green LEDs on the rack front should light, indicating that at least two of the PDUs are functioning. 255 Racking