User Guide

14 ASUS PCI-SC875 User’s Manual
IV. CONFIGURATION
Device Setup Menu
When you select a specific device from the Device Selections menu, your computer
monitor displays a new menu. The settings in this menu affect individual SCSI
devices attached to the selected host adapter. Changes made from this menu do not
cause the sytem to reboot upon exit from the SCSI Configuration utility.
Sync Rate (Mega Bytes/sec) - The value set with this option defines the maximum
transfer rate the host adapter attempts to negotiate. The host adapter and a SCSI
device must agree to a rate they can both handle.
Width (bits) - The value set with this option defines the maximum data width the
host adapter attempts to negotiate. The host adapter and a SCSI device must agree
to a width they can both handle. Only host adapters that can do 16 bit data transfers
have this option enabled.
Disconnect - SCSI devices have the ability to disconnect from the bus during an I/O
transfer. This option tells the host adapter whether or not to allow a device to dis-
connect. Some devices run faster with disconnects enabled (mostly newer devices),
while some run faster with disconnects disabled (mostly older devices).
Read Write I/O Timeout (secs) - This option sets the time the host adapter waits
for a read, write, verify, or seek command to complete before trying the I/O transfer
again. Since this provides a safeguard allowing the sytem to recover if an I/O opera-
tion fails, it is recommended that you always set the time-out to a value greater than
zero (no time-out).
Scan for Device at Boot Time - When there is a device you do not wish to make
available to the system, set this option to “No” for that device. Also, on a wide bus
(16 devices) with only a few devices attached, you can speed up boot time by chang-
ing this setting to “No” for all unused SCSI IDs.
Scan for SCSI LUNs - (Logical Unit Number-0 to 7) You can set this option to
“No” if you have problems with a device that responds to all LUNs whether they are
occupied or not.
Queue Tags - If your device driver can issue queue tags, this option allows you to
enable or disable the issuing of queue tags during I/O requests.
Quitting the SCSI Configuration Utility
Since some changes only take affect after your system reboots, it is important that
you quit this Configuration utility properly. You should return to the Main Menu
and exit by the Quit option. If you reboot the system without properly quitting the
utility, some changes will not take be saved.
IV. CONFIGURATION
(Device Setup/Quiting)