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36 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide
3.3 Starting 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.
3.3.1 Disk 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.
3.4 Power 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
2Gb Link
Speed
Indicates link speed Green Off On
Hub Mode Not Used Green Off Off
Table 3–2 Ops Panel LED States
LED Definition Color Normal
Status
Fault
Status