actiLib Autoloader 1U
– User and Service Guide
Page 19 of 97
IMPORTANT
The actiLib Autoloader 1U is NOT compatible with a
standard differential (Diff) or High-Voltage Differential
(HVD) SCSI bus. This loader 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
loader). These adapters are sometimes labeled high-
byte termination
6.3
SCSI Host Bus Adapter (HBA)
To get optimum performance from your actiLib Autoloader 1U you need a SCSI bus that can
transfer data at a rate that supports the loader
’s maximum burst transfer speed, see ”Maximum
storage capacity and data transfer rate” on page 92.
A single-ended SCSI host bus adapter will severely degrade performance and limit cable length.
Also, if there is any SE devices on the same SCSI bus, the entire SCSI bus will negotiate down
to SE speed, severely degrading performance.
6.4
LUN scanning
The actiLib Autoloader 1U uses a single SCSI ID per drive to control the tape drive (LUN 0) and
loader robotic (LUN 1). The loader 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 loader. It will
just see the tape drive.
IMPORTANT
Some HBAs, such as RAID controllers, do not support
LUN scanning.