Dell PowerEdge 4200 Series User Manual

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Contents

Dell PowerEdge 4200 Series User Manual Manual pdf 31 page image

Installing and Configuring SCSI Drivers 3-3SCSI Bus Interface DefinitionsThe basic host adapter settings are the SCSISelect set-tings most likely to require modification.• Host Adapter SCSI ID — This option sets the hostadapter’s SCSI identification (ID). The default set-ting is SCSI ID 7, which allows the host adapter tosupport narrow SCSI devices in addition to wideSCSI devices. Dell recommends that you leave thehost adapter set to SCSI ID 7.• SCSI Parity Checking — This option determineswhether the host adapter verifies the accuracy of datatransfer on the SCSI bus. The default setting isEnabled. You should disable SCSI Parity Checkingif any SCSI device connected to the host adapterdoes not support SCSI parity; otherwise, leave itenabled. Most SCSI devices support SCSI parity. Ifyou are unsure if a device supports SCSI parity, con-sult the documentation for the device.• Host Adapter SCSI Termination — This option setstermination on the host adapter. The default settingfor all Adaptec 78xx series host adapters is Auto.Dell recommends that you leave this option set to thedefault.Boot Device OptionsThe boot device settings allow you to specify the devicefrom which to boot your computer.• Boot Target ID — This option specifies the SCSI IDof the device from which you wish to boot your sys-tem. The default setting is SCSI ID 0. The SCSI IDselected here must correspond to the ID configuredon the boot device.• Boot LUN Number — If your boot device hasmultiple logical unit numbers (LUNs) and MultipleLUN Support is enabled (see “Advanced HostAdapter Settings” found later in this section), thisoption allows you to specify a particular LUN fromwhich to boot on your boot device. The default set-ting is LUN 0.SCSI Device/Configuration SettingsThe SCSI device/configuration settings allow you to con-figure certain parameters for each device on the SCSIbus. To configure a specific device, you must know theSCSI ID assigned to that device. If you are not sure of theSCSI ID, see “Using the SCSI Disk Utilities” found laterin this section.• Initiate Sync Negotiation — This option determineswhether the host adapter initiates synchronous datatransfer negotiation (sync negotiation) between itselfand the device. The default setting is Yes.Synchronous data transfer negotiation is a SCSI fea-ture that allows the host adapter and its attachedSCSI devices to transfer data in synchronous mode.Synchronous data transfer is faster than asynchro-nous data transfer.The host adapter always responds to sync negotia-tion if the SCSI device initiates it. If neither the hostadapter nor the SCSI device initiates sync negotia-tion, data is transferred asynchronously.Normally, you should leave the Initiate Sync Negoti-ation setting enabled, because most SCSI devicessupport synchronous negotiation and because itallows for faster data transfer.NOTE: Some older SCSI-1 devices do not supportsync negotiation. This may cause your computer tooperate erratically or hang if Initiate Sync Negotia-tion is set to Yes. Set Initiate Sync Negotiation to Nofor these devices.• Maximum Sync Transfer Rate — This option setsthe maximum synchronous data transfer rate that thehost adapter supports. The host adapter supportsrates up to 40 megabytes per second (MB/sec). Thedefault setting is 40 MB/sec (the maximum).If the host adapter is set to not negotiate for synchro-nous data transfer, the maximum synchronoustransfer rate is the maximum rate that the hostadapter accepts from the device during negotiation.(This is standard SCSI protocol.)