IBM System Storage DCS9900 1269-3S2 Storage Expansion Unit Installation, Service, and User Guide
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Note
Although the Invalid Address error LED (shown in
) is generally not used, it will flash if you
change the thumbwheel setting while the unit is powered.
The only purpose of the thumbwheel is to
identify the chassis, but it is only read at start of day. If it is change during operation, an error condition is
created.
3.3 Disk Drive 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 LED will be OFF In normal operation. It will only be ON if there is a drive fault.
Additionally, the amber LED can be made to flash by the DCS9900 as a means of identifying a
particular drive.
3.4 Power Down
To power the Enclosure down, either:
• Switch off the Power Supply/Cooling modules installed in the Enclosure.
or
• Remove AC at the power source.
