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Before you start
HP StorageWorks DAT models
This guide describes how to install and operate the following HP StorageWorks DAT models:
•HPStorageWorksDAT72x6
•HPStorageWorksDAT40x6
Which operating systems are supported?
HP StorageWorks DAT autoloaders can be connected to servers running under Windows®,
NetWare, UNIX, Tru64 and Linux. Refer to the “HP StorageWorks Tape Software
Compatibility” topic on our World Wide Web site (
www.hp.com/go/connect) for more
information about the operating system versions that are supported.
How do I connect the autoloader to my server?
You will need a properly installed and configured SCSI host bus adapter (HBA) or a built-in
SCSI controller on your server. Your autoloader is supplied with a VHD-to-HD cable to attach
the drive to a spare, external VHD SCSI port on the server. It is also shipped with a multimode
terminator. The cable and terminator are appropriate for a wide, low voltage differential (LVD)
or single-ended (SE) SCSI bus.
If the SCSI cable supplied with your autoloader is not appropriate for your server’s external
SCSI connector, you will need to order an adapter or new cable. See also "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 autoloader supports a burst
transfer rate of 40 MB/sec. To benefit from this level of performance, it is important to ensure
that the devices 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
exceed this.
• LVD-rated SCSI cabling and terminators. The LVD interface enables the data to be
transferred at the device's maximum rate.
If you attach the device to a lower specification SCSI bus, it may still work but data will not be
transferred as quickly.
The devices are not compatible with high voltage differential (HVD) SCSI devices.
The following guidelines apply:
• For optimum performance the autoloader should be the only device on the SCSI bus.
• Always terminate the SCSI bus.
• Do not attach the autoloader to the same SCSI bus as a your disk drive or to a RAID
controller.
autoload_master-frame6.fm Page 3 Monday, December 29, 2003 9:39 AM