User manual ASUS LSI896

[. . . ] LSI Integrated SCSI LSI 896 32-bit 2Ch. Ultra160 SCSI Contents General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 SCSI Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 The SCSI Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Some devices run faster with disconnects enabled (mostly newer devices), while some run faster with disconnects disabled (mostly older devices). ASUS LSI SCSI User's Manual 3. Configuring Read/Write I/O Time-out (seconds) ­ This option sets the amount of time the integrated SCSI waits for a read, write, or seek command to complete before trying the I/O transfer again. Since this provides a safeguard allowing the system 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 occupied 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. Queue Tags ­ This option allows you to enable or disable the issuing of queue tags during I/O requests when your device driver can do this. Format Device ­ If enabled, this option allows you to low-level format a magnetic disk drive. Low-level formatting will completely and irreversibly erase all data on the drive. Note that this utility will only format 512 byte sectors. For other sector sizes, do not use this utility. Verify ­ This option allows you to read all the sectors on a disk looking for errors. When selected, this option displays the following message: "Verify all sectors on the device Press ESC to abort Else press any key to continue" Help ­ This option brings up a help screen with information about the current menu. Restore Default Setup ­ This option resets all device selections back to their optimal settings. Select this option to restore all manufacturing defaults for the specified adapter. Note that all user customized options will be lost upon saving after restoring default setup. Exit this menu ­ This option allows you to leave the current menu screen and return to the previous screen. ASUS LSI SCSI User's Manual 13 3. Configuring Exiting the SCSI BIOS Utility Since some changes only take effect after your system reboots, it is important that you exit this configuration utility properly. Return to the Main Menu and exit by using the Quit option. IMPORTANT: If you reboot the system without properly exiting the utility, some changes may not take effect. 3. Configuring 14 ASUS LSI SCSI User's Manual 3. Configuring Glossary of Terms and Abbreviations Address - A specific location in memory, designated either numerically or by a symbolic name. Asynchronous Data Transfer - A method of transmission which does not require a common clock, but separates fields of data by stop and start bits. [. . . ] Synchronous Data Transfer - One of the ways data is transferred over the SCSI bus. Transfers are clocked with fixed-frequency pulses. This is faster than asynchronous data transfer. Synchronous data transfers are negotiated between the SCSI integrated SCSI and each SCSI device. [. . . ]