Adaptec Enhanced Mode SCSI host adapter subsystem
The Adaptec Enhanced Mode host adapter driver provides a Storage
Device Interface (SDI)-compliant
interface to any Adaptec Host Adapters that support the Adaptec Enhanced
These devices include AHA-1740/1742, and AHA-1740A/1742A.
Note that the AHA-174x and AHA-174xA series are only
supported by this driver when configured in enhanced mode.
Support for the AHA-174x and AHA-174xA when they are
configured in Standard Mode is provided by the
The Adaptec Enhanced Mode host adapter driver enables SDI-compliant
target drivers (such as sd01 and st01) to communicate
on the SCSI bus with target controllers and logical units.
This allows normal access to mass-storage devices using standard system
interfaces and filesystems.
It is also possible for an application to access the SCSI bus
subsystem directly by using the pass-through interface.
Adaptec SCSI controllers cannot be used reliably with Emulex
SCSI/ESDI bridge controllers (also known as AT&T DCM/4E).
This is due to hardware-induced timing differences between these bridge
controllers and any SCSI-controllers other than the one that they were
designed to be used with.
It is not possible to provide a software solution to this problem.
Exercise extreme caution when using the pass-through interface.
It is possible to interfere with normal system I/O and cause hangs if
pass-through is used to an active device.
Pass-through should only be used to a device that is otherwise quiescent.
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004