Compaq AA-RHGWB-TE manual Configuring a Shared Scsi Bus for Tape Drive Use

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The tape drive SCSI connectors are labeled DLT1 (tape drive 1) and DLT2 (tape drive 2). The control panel designation for the drives is DLT0 (tape drive 1) and DLT1 (tape drive 2).

The default for the TL881 or TL891 DLT MiniLibrary is to place the robotics controller and tape drive 1 on the same SCSI bus (Figure 8–17). A 0.3-meter SCSI jumper cable is provided with the unit. Plug this cable into the second connector (from the left) and the third connector. If the MiniLibrary has two drives, place the second drive on the same SCSI bus with another 0.3-meter SCSI bus jumper cable, or place it on its own SCSI bus.

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The internal cabling of the TL881 and TL891 is too long to allow external termination with a trilink/terminator combination. Therefore, the TL881 or TL891 must be the last device on the shared SCSI bus. They may not be removed from the shared SCSI bus without stopping all ASE services that generate activity on the bus.

To achieve system performance capabilities, we recommend placing no more than two tape drives on a SCSI bus.

We recommend that tape devices be placed on separate shared SCSI buses, and that there be no storage devices on the SCSI bus.

The cabling depends on whether or not there are one or two drives, and for the two-drive configuration, if each drive is on a separate SCSI bus.

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It is assumed that the library robotics is on the same SCSI bus as tape drive 1.

To connect the library robotics and one drive to a single shared SCSI bus, follow these steps:

1.Connect a 328215-00X, BN21K, or BN21L between the last Y cable or trilink connector on the bus to the leftmost connector (as viewed from the rear) of the MiniLibrary. The 328215-004 is a 20-meter cable.

2.Install a 0.3-meter SCSI bus jumper between the rightmost robotics connector (second connector from the left) and the left DLT1 connector (the third connector from the left).

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