HP StorageWorks DAT Tape Drives User Guide - SCSI (April 2005)

HP StorageWorks DAT Tape Drives User Guide 27

3. Attach the VHD connection on the SCSI cable to the server’s external SCSI connector and secure

it by tightening the screws.

Figure 12 Connecting the SCSI cable

4. Attach the HD connection on the SCSI cable to one of the SCSI connectors on the rear panel of

the tape drive and secure it by tightening the screws.

5. Connect the LVD terminator to the drive’s other SCSI connector and tighten the screws to secure

it.

Why does the tape drive need a terminator?

Terminators are essential, as they provide the correct voltages on the SCSI bus and prevent unwanted

signal reflections from interfering with data transfers. The rule is:

There must be termination at both physical ends of the bus and only at the ends.

Normally the HBA forms one end of the SCSI bus and provides termination. You, therefore, need to

ensure that the other end of the bus is terminated. If the tape drive is at the end of the SCSI bus, the

terminator must be attached to the tape drive.

If you want to attach additional devices to the SCSI bus after the tape drive, you will need to remove the

SCSI terminator and attach the next device to this SCSI connector. Make sure that you attach the

terminator to the last device in the chain.

Always use an LVD terminator (supplied with the tape drive) or a multimode terminator. See ”SCSI

configuration guide” on page 57 for more information about SCSI cables and termination.

LVD SCSI terminator