Avago Technologies LSI20160 - Manual (Page 121)

Troubleshooting 5-17
Copyright © 1993–2001 by LSI Logic Corporation. All rights reserved.
Problems with SCSI devices installation or operation.
If a SCSI device is not operating properly (either the device is not found
or a SCSI interface error occurs during scanning), it is possible that the
third party device drivers do not support the auto request sense feature
of LSI Logic host adapters. Disable the auto request sense feature as
described below and try the device operation again.
Step 1. To disable the auto request sense feature, use the
SYMNO_AR.REG file (supplied with the SDMS driver installation
files). Either double click on the file in Windows Explorer or type
REGEDIT SYMNO_AR.REG at the command prompt.
This inserts a registry entry that disables the auto request
sense feature. You must reboot your system for this change to
take effect.
Step 2. To re-enable the auto request sense feature, use the
SYM_AUTO.REG file and perform one of the update methods
described in the preceding paragraph.
Problems with certain SCSI devices when using an Ultra SCSI
adapter.
Some SCSI devices do not function properly when the adapter attempts
to negotiate Ultra SCSI transfer rates. If a device is not operating
properly, check the transfer speed setting using the SDMS 4.XX PCI
SCSI BIOS Configuration Utility (press
Ctrl-C when the SDMS PCI
SCSI BIOS banner appears during the system boot process). Devices
that do not support Ultra SCSI should be set to a maximum of
10 Mbytes/s for 8-bits, and 20 Mbytes/s for 16-bits.
Problems with Ultra160 SCSI devices using Ultra160 SCSI protocol.
If the system is configured with an LSI Logic host adapter that supports
Ultra160 SCSI and an Ultra160 SCSI device is on the SCSI bus,
intermittent problems and possible system crashes can occur if the SCSI
bus cable and terminators do not conform to the Ultra160 SCSI
specification.
•
To disable Ultra160 SCSI support for all devices, use the SDMS 4.XX
PCI SCSI BIOS Configuration Utility (press
Ctrl-C when the SDMS
PCI BIOS banner appears during the system boot process).