Specifications

Tagged queuing, which is also called command queuing, is a
SCSI-II feature that allows disk read and write commands to be
queued within a disk drive’s memory. This enables the drive to
sort commands for optimum efficiency.
Scatter-gather is an operating system and hardware feature that
allows several sequential read or write operations to be performed
at the same time, even though the system buffers for those
operations may not be physically contiguous in memory. The net
result is a reduction in disk latency and an increase in throughput.
The UNIX SCSI Manager also provides the following features for
your SCSI interface:
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Support for two SCSI adapter cards.
A new command, change-ha, allows you to change the system
files interactively to identify SCSI devices attached to
a different SCSI adapter card. You can use change-ha to
change the SCSI adapter associated with any SCSI device.
A new command, eisa, displays a report on the devices
attached to the SCSI interface.
A new version of the SCSI disk driver Sdsk provides tagged
queuing and scatter-gather capabilities.
A new version of the SCSI tape driver Stp allows simultaneous
access to the tape devices on different SCSI interfaces.
A new version of the CD-ROM driver Scrom allows multiple
processes to access the CD-ROM device.
Enhancements to configuration utilities, such as mkdevhd and
mkdev tape, support the configuration and use of two SCSI
adapter cards.
A new tar binary provides fixes that prevent tar from
inappropriately ignoring files with certain nodes.
7-2 Installing Software Drivers for UNIX