actiLib Library 4U
– User and Service Guide
Page 23 of 103
6.2
SCSI requirements
The actiLib Library 4U incorporates a wide SCSI-4 Low-Voltage Differential (LVD) SCSI bus, but may
also be attached to a Single-Ended (SE) SCSI bus. Make sure your SCSI host adapter or controller
supports these standards. If you connect the Library to an SE SCSI bus, or if there are SE devices
attached to the same SCSI bus, the Library
’s performance is limited to the maximum data transfer
speed and maximum cable lengths of the SE bus. For these reasons, BDT strongly recommends that
you do not use a SE SCSI bus with the Library.
IMPORTANT
Do not connect an LTO device to a SE SCSI bus, as it
will severely degrade performance.
IMPORTANT
The actiLib Library 4U is NOT compatible with a
standard differential (Diff) or High-Voltage Differential
(HVD) SCSI bus. This Library 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 Library). These adapters are sometimes labeled
high-byte termination
6.3
SCSI host bus adapter
To get optimum performance from your actiLib Library 4U you need a SCSI bus that can transfer data
at a rate that supports the Library
’s maximum burst transfer speed, see ”Maximum storage capacity
and data transfer rate” on page 95.
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 Library 4U uses a single SCSI ID per drive to control the tape drive (LUN 0) and Library
robotic (LUN 1). The Library 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 Library. It will just see the tape
drive.
IMPORTANT
Some HBAs, such as RAID controllers, do not support
LUN scanning.
Summary of Contents for actiLib Autoloader 4U
Page 40: ...actiLib Library 4U User and Service Guide Page 40 of 103 Figure 24 Interaction Mode Commands ...
Page 43: ...actiLib Library 4U User and Service Guide Page 43 of 103 Figure 27 Interaction Mode Service ...
Page 60: ...actiLib Library 4U User and Service Guide Page 60 of 103 Figure 40 Configuration license key ...
