Technical data

Table 10–1: Hardware Components Used for Configuration Shown in
Figure 10–9 and Figure 10–10
Callout Number
Description
1
BN21W-0B Y cable
2
H879-AA terminator
3
BN21K, BN21L, or 328215-00X cable
a
4
H885-AA trilink connector
a
The maximum combined length of the BN21K, BN21L, or 328215-00X cables must not exceed 25 meters (82
feet).
10.4.3.2 Connecting Two BA356s for Shared SCSI Bus Usage
When you use two BA356 storage shelves on a shared SCSI bus in a
TruCluster configuration, one BA356 must be configured for SCSI IDs 0
through 6 and the other configured for SCSI IDs 8 through 14.
To prepare two BA356 storage shelves for shared SCSI bus usage (see
Figure 10–10), follow these steps:
1. Complete the steps of Section 10.4.1.2 for each BA356. Ensure that the
personality module address switches on one BA356 are set to select
SCSI IDs 0 through 6, and that the address switches on the other BA356
personality module are set to select SCSI IDs 8 through 14.
2. If either of the BA356 storage shelves will be on the end of the SCSI bus,
attach an H879-AA terminator to the H885-AA trilink on the DWZZB
for the BA356 that will be on the end of the bus.
3. Connect a BN21K or BN21L cable between the H885-AA trilinks.
4. When the KZPSA-BB or KZPBA-CB host bus adapters have been
installed:
• If the BA356 storage shelves are on the end of the shared SCSI bus,
connect a BN21K (or BN21L) cable between the BN21W-0B Y cables
on the host bus adapters. Connect another BN21K (or BN21L) cable
between the BN21W-0B Y cable with an open connector and the
H8855-AA trilink (on the BA356) with an open connector.
• If the BA356s are in the middle of the shared SCSI bus, connect a
BN21K (or BN21L) cable between the BN21W-0B Y cable on each
host bus adapter and the H8855-AA trilink on a BA356 storage shelf.
Configurations Using External Termination or Radial Connections to
Non-UltraSCSI Devices 10–21