IBM DCS9550 1S1 manual SCM Input/Output Module, DCS9550 Controller Settings

						Introduction
Table 1–1	Ops Panel Switch Functions (Default settings for DCS9550 1S1 Storage Expansion
UnitSCM usage at 2Gb/s)
Switch Number		Function	Recommended Setting			Definition
*See Sw 11
7 & 8		Drive Loop Speed	Sw 7		Sw 8
		Select
DCS9550 Controller Settings			Off		Off	Force 1Gb/s
DCS9550 Controller Settings			On		Off	Force 2Gb/s (recommended)
9 & 10		Drive Addressing	Sw 9		Sw 10
		Mode Selection
DCS9550 Controller Settings			Off		On	Mode 1
			On		On	Mode 0
			On		Off	Mode 2
			Off		Off	Mode 3 (not supported)*
11		SOFT SELECT		On		Selects functions using the
						hardware switches
12		Not Used		Off

Note: * Please contact your supplier for further information.

Important Switch settings are only read at Power On.

1.2.3SCM Input/Output Module

The DCS9550 1S1 Storage Expansion Unit includes an enclosure with rear facing bays which houses one or two SATA Control Interface Adaptor (SCM I/O) modules (see Figure 1–3), dependent on configuration required.

The plug-in SCM I/O modules have been designed for integration into a DCS9550 1S1 Storage Expansion Unit, providing external FCAL cable interfacing with up to 16 SATA disk drives.

Processors housed on the SCM I/O modules provide enclosure management and interface to devices on the Backplane, PSU, SCM and Ops Panel, to monitor internal functions.

The module incorporates the following LED indicators:

Host

Important If only one SCM module is fitted, the SCM module must be installed in Rear Bay 4 location [see Figure 1–3, ”Enclosure Chassis (Rear)”, on page 2] and a Blank I/O module fitted in the unused

bay.
Table 1–2	SCM I/O Module LEDs
LED		Definition	Color	Normal	Fault
				Status	Status
FC Host Port 0		Incoming FC signal is GOOD	Green		Off
Signal Good		No connection or incorrect connection		On
		Invalid SFP connection			Flashing

IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide 5