HP StorageWorks DAT 40m Getting Started Manual page 6

adapter (HBA) or a built-in SCSI controller on your SCSI host with a spare low voltage
differential (LVD) SCSI port and LVDS-compatible cables and terminators. See "Checking the
SCSI connection" on page 9.
Why is the SCSI bus type important?
The SCSI bus type determines the speed at which data can be transferred between devices on
the bus and the maximum length of cable that can be used. The drives support a burst transfer
rate of 40 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 Ultra Wide, Ultra2 Wide, Ultra3 (160) or Ultra4 (320) SCSI bus. Ultra Wide SCSI
supports the maximum bus speed of 40 MB per second, Ultra2, Ultra3 and Ultra4 SCSI
exceeds this.
• LVD-rated SCSI cabling and terminators. The LVD interface enables the data to be
transferred at the drive's maximum rate and provides a maximum cable length of 12 meters.
If you attach the drive to a lower specification SCSI bus, it may still work but data will not be
transferred as quickly and you will need to use shorter cable lengths.
Note The drives are not compatible with high voltage differential (HVD) SCSI devices.
How can I check the SCSI bus type and SCSI ID?
For many operating systems, you can install HP Library & Tape Tools from
support/tapetools and run the "Install Check" to check your server's current SCSI
configuration (see page 29). This will provide information about the SCSI bus and the SCSI
IDs in use. See also the SCSI topic in the electronic User's Guide on the
HP StorageWorks Tape CD-ROM for other ways of checking the SCSI bus type.
Do I need additional items for installation?
• You will need to order the correct size SCSI cables and terminators to suit the particular
configuration of your tape array. Cable and terminator options are listed at the HP tape
array support web site:
local HP sales office. Refer to your tape array's Getting Started Guide for details of how to
install SCSI cables and terminators on the rear panel of the tape array. The latest version of
this document can also be downloaded from
• If you do not have a spare, suitably rated SCSI connector on your server, you must install a
new HBA (also known as a SCSI card). This should be of an Ultra Wide or higher SCSI
specification. We recommend that a 64-bit Ultra 3 (160) HBA is used. You will need to
purchase and install the new HBA into an unused, 64-bit PCI expansion slot within your
server before installing your tape drive. (The kit can also be installed in a 32-bit PCI
expansion slot, but performance may be degraded.)
Refer to our World Wide Web site for recommended products, configurations and ordering
information:
4
www.hp.com/go/tapearray, and can be ordered from your
www.hp.com/go/connect
www.hp.com/go/tapearray.
www.hp.com/support .
or
www.hp.com/