Compaq AA-RHGWB-TE Preparing the TZ89 for Shared Scsi Usage, Setting the DS-TZ89N-VW Scsi ID

Ensure that DWZZA jumper J2 or DWZZB jumpers W1 and W2 are installed to enable the single-ended termination.

Remove the termination from the differential end by removing the five 14-pin SIP resistors.

2.Attach a trilink connector to the differential end of the DWZZA or

DWZZB.

3.Connect the single-ended end of a DWZZA to the TZ88N-TA with a BC19J cable.

Connect the single-ended end of a DWZZB to the TZ88N-TA with a BN21M cable.

4.Install a H8574-A or H8890-AA terminator on the other TZ88N-TA SCSI connector.

5.Connect a trilink or Y cable to the differential shared SCSI bus with BN21K or BN21L cables. Ensure that the trilink or Y cable at the end of the bus is terminated with an H879-AA terminator.

The single-ended SCSI bus may be daisy chained from one single-ended tape drive to another with BC19J cables as long as the SCSI bus maximum length is not exceeded. Ensure that the tape drive on the end of the bus is terminated with a H8574-A or H8890-AA terminator.

You can add additional TZ88N-TA tape drives to the differential shared SCSI bus by adding additional DWZZA or DWZZB/TZ88N-TA combinations.

______________________ Note _______________________

Ensure that there is no conflict with tape drive, system, and disk SCSI IDs.

8.2 Preparing the TZ89 for Shared SCSI Usage

Like the TZ88, the TZ89 comes in either a tabletop (DS-TZ89N-TA) or a StorageWorks building block (SBB) 5.25-inch carrier (DS-TZ89N-VW). The SBB version takes up three slots in a BA356 StorageWorks enclosure.

The following sections describe how to prepare the TZ89 in more detail.

8.2.1 Setting the DS-TZ89N-VW SCSI ID

The DS-TZ89N-VW backplane connector makes a connection with the backplane in the middle of the three slots occupied by the drive. If the switches are set to automatic to allow the backplane position to select the SCSI ID, the ID corresponds to the backplane position of the middle slot. For example, if the DS-TZ89N-VW is installed in a BA356 in slots 1, 2, and

Configuring a Shared SCSI Bus for Tape Drive Use 8–5