Tandberg Data DAT 160, User Manual

Page: 49 / 58

8
SCSI configuration guide
In this chapter:
• “ SCSI in DAT devices ” on page 49
• “ SCSI terminology ” on page 50
• “ Setting up the SCSI bus ” on page 50
• “ Identifying SCSI IDs ” on page 51
• “ Setting the SCSI ID on DAT drives ” on page 52
• “ SCSI termination ” on page 52
• “ SCSI cables ” on page 54
SCSI in DAT devices
DAT tape drives are Ultra160 SCSI-2 compatible devices. They are designed
to operate on a low voltage differential (LVD) SCSI interface. They are not
compatible with high voltage differential (HVD) SCSI devices.
The drives support a burst transfer rate of 160 MB/sec. To benefit from this
level of performance, it is important to ensure that the drives are connected
to a SCSI bus of a similar or higher specification. This means that you need:
• An Ultra160 or Ultra320 SCSI host bus adapter. Ultra2 SCSI is also
supported, but performance may be degraded if there are several devices
on the SCSI bus.
• LVD-rated SCSI cabling and terminators. The LVD interface enables the
data to be transferred at the drive's maximum rate and provides a max-
imum cable length of 12 meters.
We also recommend that the tape drive is connected to a dedicated host
bus adapter. If you need to connect multiple devices to the bus, performance
may be restricted if there are too many (3 or more) devices on the bus that
are accessed simultaneously. Connecting devices of lower SCSI
specification, such as Ultra2 or Ultra SCSI, may also restrict performance
to your tape drive. Using Single Ended 8-Bit SCSI devices on the same bus
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# August 2009