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24 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide
2.8 Drive Enclosure Device Addressing
Each enclosure has 16 drive bays. The SEL_ID of each drive is determined by the device slot
(0-15) in which it is installed and the address range setting, which is set by means of the
Enclosure ID switch on the Ops Panel (shown in Figure 1–2 on page 2) at the rear of the
enclosure. The switch settings are shown in Table 2–2
Figure 2–9 Installing an SCM I/O Module in Bay 4
Table 2–2 Ops Panel Switch Functions (Default settings for DCS9550 1S1 Storage Expansion Unit
SCM usage at 1Gb/s)
Switch
Number
Function Recommended
Setting
Definition
1 thru 6 Not Used Off
7 & 8 Drive Loop
Speed Select
Sw 7 Sw 8
DCS9550 Controllers On Off Force 2Gb/s
9 & 10 Drive
Addressing
Mode Selection
Sw 9 Sw 10
DCS9550 Controllers Off On Mode 1