Adaptec 2910C User Guide - Page 8

Default Settings The AHA-2910C has default settings appropriate for most PCI systems (see the table of settings below). Do not run SCSISelect unless you want to change a default setting. SCSI Bus Interface Definitions Host Adapter SCSI ID SCSI Parity Checking Host Adapter SCSI Termination Additional Options ® SCSI Device Configuration Initiate Sync Negotiation Maximum Sync Transfer Rate Enable Disconnection Additional Options ® Advanced Configuration Options Plug and Play SCAM Support Default 7 Enabled Automatic Default Yes (Enabled) 10 MBytes/sec Yes (Enabled) Default Disabled Definitions of SCSISelect Settings This section defines the SCSI device settings for the host adapter and for each device on the SCSI bus. SCSI Bus Interface Definitions The following definitions are most likely to require modification: s Host Adapter SCSI ID-This option sets the SCSI ID of the host adapter. To give the host adapter the highest priority on the SCSI bus, we recommend that you leave the host adapter at its default setting of SCSI ID 7. s SCSI Parity Checking-This option determines whether the host adapter verifies the accuracy of data transferred on the SCSI bus. The default setting is Enabled. If any SCSI device connected to the host adapter does not support SCSI parity, disable SCSI Parity Checking on the host adapter and all SCSI devices. To determine if a device supports SCSI parity, consult the device documentation. s Host Adapter SCSI Termination-This option sets termination on the host adapter. You can set termination to Automatic, Enabled, or Disabled. In general, you should leave this option set to its default setting of Automatic. SCSI Device Configuration Options SCSI device configuration options allow you to configure parameters for each device on the SCSI bus. To configure a specific device, you must identify the SCSI ID assigned to that device. To determine the SCSI ID of a device, see Using the SCSI Disk Utilities on page 9. s Initiate Sync Negotiation-This option determines whether or not synchronous data transfer negotiation between the host adapter and a device is initiated by the host adapter. The default setting is Yes (Enabled). Set Initiate Sync Negotiation to No for devices that do not support Sync Negotiation. s Maximum Sync Transfer Rate-This option sets the maximum synchronous data transfer rate that the host adapter supports. The host adapter supports rates up to 10 MBytes/sec. If Initiate Sync Negotiation is set to No, then the maximum synchronous transfer rate is the maximum rate that the host adapter accepts from the device during negotiation. s Enable Disconnection-This option lets a SCSI device temporarily disconnect the SCSI device from the SCSI bus. This allows the host adapter to perform other operations while the SCSI device is disconnected. The default setting is Yes. Set Enable Disconnection to Yes if two or more SCSI devices are connected to the host adapter. Advanced Configuration Options Plug and Play SCAM Support-This option allows the host adapter to automatically assign SCSI IDs to SCSI devices that support the SCAM protocol. Caution: The default setting is Disabled. Most non-SCAM legacy devices tolerate the SCAM protocol, so you can enable this option even if you have a non-SCAM device. 8