Cabling The Expansion Unit; Scsi Cabling Information - IBM Netfinity EXP300 Installation And User Manual

Expansion unit ID label

Cabling the expansion unit

This section provides the SCSI and power cabling information. After you attach your
SCSI and power cables, use the instructions provided in "Turning the expansion unit
on and off" on page 21 for the initial startup of the expansion unit.

SCSI cabling information

The IBM Netfinity EXP300 comes with two ESM boards. There are two 68-pin SCSI
Very High Density Connector Interface (VHDCI) connectors. From left to right as
seen from the back, these connectors are for SCSI bus 2 and SCSI bus 1. See "Rear
controls, indicators, and connectors" on page 6 for the location of these connectors.
There are three ways to configure these buses.
Attention: A loss of data can occur if you change the position of internal switch 1 or
internal switch 3 after storing data on the drives. Please contact the IBM HelpCenter
for assistance if you want to change the configuration of your expansion unit from a
rack (internal switch 1 Off) to a tower (internal switch 1 On) or from a tower to a rack
orientation. See "Getting help, service, and information" on page 37" for more
information.
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IBM® Netfinity® EXP300 Installation and User's Guide
Dual-Bus configuration
0 1 2 3 4 5
2. Install the expansion unit ID label.
a. Verify the setting of the expansion unit number switch (0-9).
b. Apply the expansion unit ID label that matches the setting for the unit ID
switch in the blank label area directly to the left of the SCSI ID label.
3. Continue with "Cabling the expansion unit".
To configure each bus independently:
1. Verify that option switch 3 (inside the switch card) is set to On. See "Setting
the interface options and ID settings" on page 11 for more information.
2. Attach one external SCSI cable from the controller in the server to the SCSI-
bus 1 connector.
3. Attach a second external SCSI cable from the controller in the server to the
SCSI-bus 2 connector.
To configure the expansion unit as a single 14-drive SCSI bus:
1. Verify that Option Switch 3 (inside the switch card) is set to Off. See "Setting
the interface options and ID settings" on page 11 for more information.
6 1 2 8 9 10 11 12
SCSI ID label Serial number label
13 14