IBM DCS9550 1S1 Drive Enclosure Device Addressing, Switch, Function, Recommended, Definition

Installation

Figure 2–9Installing an SCM I/O Module in Bay 4

2.8Drive 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

Table 2–2Ops Panel Switch Functions (Default settings for DCS9550 1S1 Storage Expansion Unit SCM usage at 1Gb/s)

Switch	Function	Recommended		Definition
Number		Setting
1 thru 6	Not Used	Off
7 & 8	Drive Loop	Sw 7	Sw 8
	Speed Select
DCS9550 Controllers		On	Off	Force 2Gb/s
9 & 10	Drive	Sw 9	Sw 10
	Addressing
	Mode Selection
DCS9550 Controllers		Off	On	Mode 1

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