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must be used with a BA356 or UltraSCSI BA356 if more than
five disks are required.
The following sections provide the steps needed to connect two storage
shelves and two member systems on a shared SCSI bus:
• BA350 and BA356 (Section 9.4.2.1)
• Two BA356s (Section 9.4.2.2)
• Two UltraSCSI BA356s (Section 9.4.2.3)
9.4.2.1 Connecting a BA350 and a BA356 for Shared SCSI Bus Usage
When you use a BA350 and a BA356 for storage on a shared SCSI bus in a
TruCluster Server configuration, the BA356 must be configured for SCSI
IDs 8 through 14.
To prepare a BA350 and BA356 for shared SCSI bus usage (see Figure 9–9),
follow these steps:
1. Complete the steps in Section 9.4.1.1 and Section 9.4.1.2 to prepare
the BA350 and BA356. Ensure that the BA356 is configured for SCSI
IDs 8 through 14.
2. If either storage shelf will be at the end of the shared SCSI bus, attach
an H879-AA terminator to the H885-AA trilink on the DWZZA or
DWZZB for the storage shelf that will be at the end of the bus. You can
choose either storage shelf to be on the end of the bus.
3. Connect a BN21K or BN21L between the H885-AA trilink on the
DWZZA (BA350) and the H885-AA trilink on the DWZZB (BA356)
4. When the KZPSA-BB or KZPBA-CB host bus adapters have been
installed:
• If the 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 storage shelf) with an open connector.
• If the storage shelves 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 storage
shelf.
Figure 9–9 shows a two-member TruCluster Server configuration using
a BA350 and a BA356 for storage.
9–18 Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices