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74 Internal Drives in Servers
Termination
Termination must be present at two and only two positions on the SCSI bus—
at the beginning of the SCSI bus and at the end of the SCSI bus. Termination
is normally enabled by default on the HBA and most internal SCSI cables
have a terminator attached. This will usually be a small, rectangular block of
plastic attached to the cable end and marked ‘SCSI Terminator’.
Therefore, assuming the HBA is the first device on the bus, you should check
that the second terminator is placed after the last device. If the drive should be
the only device on a bus, as is recommended, the terminator should be
placed after the drive.
Termination Power
With HP’s Ultrium drives, termination power is always provided; you cannot
switch it off. The supply is a 5V line via a fuse and diode/capacitor
combination. In this way, the drive “tops up” the termination power voltage if
the host supply is below 5V (due to cable length or bad host termination
power).
Backup Software
You need backup software that supports the HP Ultrium drive within your
system’s configuration. In a direct attach configuration, where the tape drive
is attached to a standalone server, you can use backup software that is
designed for a single server environment. In network and SAN
configurations, you will need backup software that supports enterprise
environments. As a general rule, native backup applications (such as
NTBackup and tar) do not provide the required data streaming rate to get the
full performance of your drive. For the latest list of backup packages that
support HP Ultrium drives, please consult our World Wide Web site
(www.hp.com/go/connect).
Applications usually recognize tape drives by their manufacturers’ ID string
rather than their model number, so check the table below for the appropriate
reference.
Drive Model ID String
Generation 2 Ultrium drive
HP Ultrium 2-SCSI