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

4.3.2

Ops Panel

39

4.3.3 SCM I/O Module LEDs

41

4.4.1

Audible Alarm Mute

41

4.5.1

System Faults

42

4.5.2

Power Supply/Cooling Faults

42

4.5.3

Thermal Control

43

4.5.4

Thermal Alarm

44

4.5.5

Thermal Shutdown

44

4.6.1

Dummy Carrier Modules

45

4.9.1

Power Supply/Cooling Modules

46

4.9.2

Ops Panel

48

4.9.3

SCM I/O Module

48

4.9.4

Drive Carrier Module

50

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IBM DCS9550 1S1 manual Xiii