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RAID Array 3000 Controller Shelf
1–10 EK–SMCPQ–UG. C01
Figure 1–6 Device I/O Module Blower Status LEDs
S
HR-1
0
4
6
Left
Blower
LED
SCSI Bus
Address Switch S3
(Not Used)
SCSI Bus
Termination
Switch S4
Right
Blower
LED
NOTE
The SCSI bus address switch on the Controller
Shelf device I/O module does not control the tar-
get addresses of the SBB slots in the Device Ex-
pansion Shelves. This switch has been electrically
disabled by design. Refer to the StorageWorks
SBB Shelf I/O Module User’s Guide supplied with
the Device Expansion Shelf for a description of
how to set the SCSI IDs in each shelf.
SCSI bus termination switch S4 configures the SCSI bus termination of the De-
vice Expansion Shelves in the RAID Array 3000 storage system. The proper set-
tings for S4 are included in the cabling procedures in Chapter 3 of this guide.
1.5.3 Host I/O Module
The Controller Shelf contains two identical Host I/O modules (see Figure 1–7).
The module located directly to the left of the device I/O module is designated as
H1 and the module in the adjacent slot as H0. The host I/O module provides the
interface between the host bus and the controller(s) in the shelf.