HP StorageWorks DAT 72x10 Tape Autoloader - Manual (Page 14)

• Multi-mode rated SCSI cabling and terminators. Multi-mode terminators allow both LVD and
single-ended devices to be connected to the same bus. They detect the type of bus and
automatically supply the correct termination. The LVD interface enables the data to be transferred
at the drive’s maximum rate.
The autoloader is also supported on SE SCSI, but this will limit cable length and may degrade
performance. Similarly, if there are SE devices attached to an LVDS bus, the autoloader’s performance is
limited to the maximum data transfer speed and maximum cable lengths of the SE bus. If necessary,
install a SCSI host adapter, software, and compatible driver(s). Refer to the manuals for the host computer
and the SCSI host adapter for detailed information.
Table 3 Supported SCSI bus types
SCSI Bus Type Supported
Ultra160 LVD, Ultra320 LVD Yes. These are recommended configurations.
Ultra2 LVD, Ultra Wide LVD Yes.
Ultra wide, single-ended Yes.
Ultra narrow, single-ended Yes.
Fast, single-ended Not recommended. This will degrade performance and limit cable
length.
High Voltage Differential No. The drive will not work and you may damage the drive or controller
IMPORTANT:
The HP StorageWorks DAT 72x10 1U Tape Autoloader in NOT compatible with a standard differential
(Diff) or High-Voltage Differential (HVD) SCSI bus. This autoloader IS compatible with a narrow (50-pin)
SCSI bus using a 68-pin to 50-pin adapter that terminates the unused 18 pins (Not included with the
autoloader). These adapters are sometimes labeled high-byte termination.
LUN scanning
The HP StorageWorks DAT 72x10 1U Tape Autoloader uses a single SCSI ID and dual LUNs to control
the tape drive (LUN 0) and autoloader robotic (LUN 1). The autoloader requires an HBA that supports
LUN scanning. If it is not enabled, your host system will not scan beyond LUN 0 and will fail to discover
the autoloader. It will just see the tape drive.
Some HBAs, such as RAID controllers, do not support LUN scanning. For the most up-to-date SCSI HBA
compatibility information, refer to www.hp.com/go/connect .
Preparing the host
IMPORTANT:
Use proper procedures to prevent electrostatic discharge (ESD). Use wrist-grounding straps and anti-static
mats when handing internal components.
Follow these general guidelines:
• If necessary, install a suitably rated HBA, see “ SCSI requirements ” on page 13. Remember that if
there are any SE devices on the same SCSI bus, the entire SCSI bus will negotiate down to SE
speed and severely degrade performance and limit cable length.
• Make sure that your backup application and SCSI host bus adapter are compatible with the
autoloader.
• If the host server is connected to a network, check with the system administrator before turning
off power.
14 The HP StorageWorks DAT 72x10 1U Tape Autoloader