Asus PCI-SC896 User Manual page 27

3. Configuring
3.2.3 Device Selections Menu
When you select the Device Selections option, the corresponding menu ap-
pears. The settings in this menu affect individual SCSI devices attached to the
selected host adapter. Changes made from this menu do not cause the system
to reboot upon exit from the SCSI BIOS Configuration Utility. To change a
value, select the required device by using the arrow keys and press Enter. A
new menu appears providing the options and utilities available. For example,
you could cursor to Sync Rate to change the Sync Rate value of the chosen
device.
Sync Rate (Mbytes/s) – The value set with this option defines the maximum
data 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 SCSI data
width the host adapter attempts to negotiate. The host adapter and a SCSI de-
vice 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 initiator
during an I/O transfer. This disconnect frees the SCSI Bus to allow other I/O
processes. This option tells the host adapter whether or not to allow a device to
disconnect. Some devices run faster with disconnects enabled (mostly newer
devices), while some run faster with disconnects disabled (mostly older de-
vices).
Read/Write I/O Time-out (seconds) – This option sets the amount of time
the host adapter waits for a read, write, or seek command to complete before
trying the I/O transfer again. Since this provides a safeguard allowing the sys-
tem to recover if an I/O operation fails, it is recommended that you always set
the time-out to a value greater than zero.
NOTE: If the time-out is set to zero, then the I/O will never time-out.
Scan for Device at Boot Time – When there is a device you do not want to be
available to the system, set this option to "No" for that device. Also, on a bus
with only a few devices attached, you can speed up boot time by changing this
setting to "No" for all unused SCSI IDs.
Scan for SCSI Logical Units (LUNs) – You can set this option to "No" if you
have problems with a device that responds to all LUNs whether they are occu-
pied or not. For example, if there is a SCSI device with multiple LUNs but you
do not want all of those LUNs to be available to the system, then set this option
to "No." This will limit the scan to LUN0 only.
ASUS PCI-SC896 User's Manual 27