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

Installing a removable DAT tape drive32

For many operating systems you can install HP Library & Tape Tools from the

HP StorageWorks Tape CD-ROM and run the “Install Check” to check your computer’s current

SCSI configuration (see ”Diagnostic tools” on page 49). This will provide information about the

SCSI bus and the SCSI IDs in use. The UNIX Configuration Guide on the HP StorageWorks Tape

CD-ROM, also provides instructions on how to determine the SCSI IDs of existing devices.

2. Set the appropriate switch. Figure 5 shows the address switch on the back panel of the

HP Tape Array 5300.

Figure 16 SCSI address switch on tape array

3. The HP Tape Array 5300 has four SCSI ID switches to enable the installation of up to four

half-height drives.

4. Make sure that a SCSI terminator is attached to the appropriate SCSI-OUT connector on the

back of the tape array.

5. Determine whether you need to change the SCSI ID from the default of 3.

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. Attach the terminator to the appropriate SCSI-OUT

connector on the tape array.

SCSI

Bay 4

SCSI

Bay 2

SCSI

Bay 3

SCSI

Bay