IBM DCS9550 1S1 manual Starting the Drives, Disk Drives LEDs, Power Down

Operation

Table 3–2Ops Panel LED States

LED	Definition	Color	Normal	Fault
			Status	Status
2Gb Link	Indicates link speed	Green	Off	On
Speed
Hub Mode
	Not Used	Green	Off	Off

3.3Starting the Drives

Unless otherwise selected during installation, all drives in the enclosure should automatically start their motors. If this has not occurred one of the following conditions may exist:

•There may be a power problem (an alarm and power fault indication would normally be active).

•If there is only one Power Supply/Cooling Module present, the drive motors will spin up in a delayed sequence.

3.3.1Disk Drives LEDs

Each drive carrier incorporates two indicators, an upper (GREEN) and lower (AMBER). In normal operation the Green LED will be ON and will flicker as the drive operates.The amber indicator is OFF during normal operation and ON if there is a drive fault present.

3.4Power Down

To power the Enclosure down, either

•Switch off the Power Supply/Cooling modules installed in the Enclosure.

or

• Remove AC Mains at the power source

36 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide