Avago Technologies LSI20160 User Manual
Page 87
Troubleshooting
4-19
Copyright © 1993–2001 by LSI Logic Corporation. All rights reserved.
•
If the system operates properly without Ultra SCSI enabled, it is
highly likely that the SCSI bus cable and terminators are not
configured correctly for Ultra SCSI. Refer to the appropriate LSI
Logic Host Adapter User’s Guide as listed in the
section on
At Ultra3 speed (160 Mbytes/s), the system hangs (waits forever),
has a long boot time, or SCSI device is not available.
Some older SCSI devices do not tolerate Domain Validation operations.
At system boot time, Domain Validation is performed to test the data
integrity of the SCSI bus between the host adapter and each target
device. With some older SCSI devices, these operations can cause the
device to stop responding to SCSI commands.
To resolve this problem, disable Domain Validation either for a specific
SCSI target or all adapters controlled by the driver. To do so, follow these
steps:
•
To disable Domain Validation for a specific SCSI target, use the
SDMS 4.XX PCI SCSI BIOS Configuration Utility to set the Sync
Rate to 0 (async) and the Data Width to 8. This target will now run
in async/narrow mode and no Domain Validation operations will be
performed on it.
•
To disable Domain Validation for all host adapters controlled by this
driver, use the
SYMNO_DV.REG
file (supplied with the SDMS
Windows NT driver files).
Either double click on the file in Windows Explorer/File Manager
or
Type
REGEDIT SYMNO_DV.REG
at the command prompt.
This inserts a registry entry that disables Domain Validation
operations. You must reboot your system for the new registry setting
to take effect.
•
To re-enable the Domain Validation feature, use the
SYM_DOMV.REG
file and perform one of the update methods described in the
preceding paragraph.