4.3 Powering On/Off the Disk Array UnitThis section describes how to turn on or off the power of the disk array unit. Turning on or off thepower carelessly may cause some data to be corrupted, some software to operate incorrectly, and/orthe unit to become defective.Turning on AC powera) Before turning on the power, push each hard disk drive to make sure they are all fullyinserted.b) Turn on both power switches on the rear of the disk array unit.If an additional disk enclosure is connected, first turn on the two power switches on the rearof the additional disk enclosure, and then turn on the two power switches on the rear of thedisk array unit. Alternatively, turn on the disk array unit and all the additional disk enclosuresconnected with the disk array unit at the same time.The disk array unit and additional disk enclosure have a redundant power configuration toprevent the entire unit from shutting down due to a single failure. Therefore, when turning onthe disk array unit, turn on all the power switches (of the disk array unit and additional diskenclosures) at the rear of the unit.When turning on the power switches, confirm that the POWER GOOD LED (green) of thepower supply and the POWER LED (green) on the front panel of the disk array unit and theadditional disk enclosure(s) light on. Power supply starts, and the POWER LED (green) is onwhile the power switches are on.The disk array unit performs the self-test and initialization sequence immediately after thepower is turned on. When the self-test and initialization terminate and the disk array unitbecomes ready, the DIR LED of the controller on the disk array unit stops lighting and startsflashing. Confirm the DIR LED status, and then turn on the host system.The disk array unit takes 15 minutes (at maximum) to start.- 28 -