Compaq AA-RHGWB-TE manual Connecting Storage Shelves Together

SCSI bus (cable and BA356) under the 3-meter limit to still allow high speed operation.

If you are using a DWZZB-VW, install it in slot 0 of the BA356.

9.4.1.3 Preparing an UltraSCSI BA356 Storage Shelf for a TruCluster Configuration

An UltraSCSI BA356 storage shelf is connected to a shared UltraSCSI bus, and provides access to UltraSCSI devices on the internal, single-ended and wide UltraSCSI bus. The interface between the buses is the DS-BA35X-DA personality module installed in the UltraSCSI BA356.

To prepare an UltraSCSI BA356 storage shelf for usage on a shared SCSI bus, follow these steps:

1.Ensure that the BA35X-MJ jumper module is installed behind slot 6 (see Section 9.3.2.1, Figure 9–7, and Figure 9–8).

2.Set the SCSI bus ID switches on the UltraSCSI BA356 personality module (DS-BA35X-DA, Figure 9–3) as follows:

•If the UltraSCSI BA356 is to house disks with SCSI IDs in the range of 0 through 6, set the personality module address switches S3-1 through S3-7 to OFF.

•If the UltraSCSI BA356 is to house disks with SCSI IDs in the range of 8 through 14, set personality module address switches S3-1 through S3-3 to ON and switches S3-4 through S3-7 to OFF.

3.Disable the UltraSCSI BA356 differential termination. Ensure that personality module (DS-BA35X-DA) switch pack 4 switches S4-1 and S4-2 are ON (see Figure 9–3).

____________________ Note _____________________

S4-3 and S4-4 are not used on the DS-BA35X-DA.

9.4.2 Connecting Storage Shelves Together

Section 9.4.1 covered the steps necessary to prepare the BA350, BA356, and UltraSCSI BA356 storage shelves for use on a shared SCSI bus. However, you will probably need more storage than one storage shelf can provide, so you will need two storage shelves on the shared SCSI bus.

______________________ Note _______________________

Because the BA350 contains a narrow (8-bit), single-ended SCSI bus, it only supports SCSI IDs 0 through 7. Therefore, a BA350

Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices 9–17