HP Tc2120 HP Server Ultra 3 SCSI Host Bus Adapter Installation and Configurati - Page 21

Chapter 2 Configuration with SCSISelect • Initiate Wide Negotiation-(Default: Yes) When set to Yes, the SCSI host bus adapter attempts 16-bit data transfer (wide negotiation). When set to No, the SCSI host bus adapter uses 8-bit data transfer unless the SCSI device requests wide negotiation. NOTE Set Initiate Wide Negotiation to No if you are using an 8-bit SCSI device that hangs or exhibits other performance problems with 16-bit data transfer rate enabled. • Enable Disconnection-(Default: Yes) When set to Yes, allows the SCSI device to disconnect from the SCSI bus. Leave the setting at Yes if two or more SCSI devices are connected to the SCSI host bus adapter. If only one SCSI device is connected, changing the setting to No results in slightly better performance. • Send Start Unit Command-(Default: Yes) When set to Yes, the Start Unit Command is sent to the SCSI device at bootup. The following three options have no effect when the SCSI host bus adapter BIOS is disabled. (The SCSI host bus adapter BIOS is normally enabled by default.) • Enable Write Back Cache-(Default: N/C) Can be used to enable or disable the write-back cache on SCSI disk drives connected to the host adapter. Leave this option at its default setting of N/C (no change), which usually allows for optimum drive performance. • BIOS Multiple LUN Support-(Default: No) Leave this setting at No if the device does not have multiple Logical Unit Numbers (LUNs). When set to Yes, the SCSI host bus adapter BIOS provides boot support for a SCSI device with multiple LUNs (for example, a CD "juke box" device in which multiple CDs can be accessed simultaneously). • Include in BIOS Scan-(Default: Yes) When set to Yes, the SCSI host bus adapter BIOS includes the device as part of its BIOS scan at bootup. 15