IBM System Storage DCS9900 1269-3S2 Storage Expansion Unit Installation, Service, and User Guide
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4.1.1.4
Controller Doesn’t Recognize the IBM System Storage DCS9900 3S2
Storage Expansion Unit
1
Check that the SAS interface cables from the IBM System Storage DCS9900 3S2 Storage Expansion
Unit to the host computer are fitted correctly.
2
Check that any SAS interface cables to the 16 Bay expansion enclosures are fitted correctly.
3
Check that the LEDs on all installed drive carrier modules are illuminated Green. Note that the drive LEDs
may not be lit during drive spinup.
4
Check that all drive carrier modules have been correctly installed.
5
Check that the EBOD module setup is as follows:
–
Check that the EBOD module has been correctly installed and all external links and cables are
securely fitted.
–
Check the maximum cable length has not been exceeded.
6
Check that the configuration switches on the Ops Panel are set correctly:
–
Switches 9 and 10 should be ON.
–
Switches 11 and 12 should be OFF.
4.2 Audible Alarm
The Ops Panel also includes an Audible Alarm which indicates when a fault state is present. The following
conditions will activate the Audible Alarm:
• Drive Fault
• Fan Fault
• Voltage out of range
• Over temperature
• Thermal overrun
• System fault
4.2.1 Audible Alarm Mute
When the Audible Alarm sounds, it may be muted by pressing the Alarm Mute push-button. Automatic
muting will take place after two minutes if the mute switch is not manually operated. The Alarm Mute
push-button is located above the indicators on the Ops Panel (
When the alarm is muted it will continue to sound with short intermittent bleeps to indicate that a problem
still exists. It will be silenced when all problems are cleared. (Refer to Thermal Shutdown states, Section
LED Test Mode
The Alarm Mute push-button can also be used to test the LEDs on the Ops Panel. When the Mute push-
button is held, all LEDs will be illuminated if there are no faults present.
