Features

SCSI Device Configuration

Sync Transfer Rate

Fast SCSI devices, including the U320-SCSI controller, are capable of transferring data to and from the SCSI bus at speeds ranging up to 320 Mbyte/s at synchronous data transfer. The configurable maximum data transfer rate is 320 Mbyte/s. For this setting the options "Wide Negotiation",

"Packatized" and "Disconnection" must be activated (YES).

Packetized

When activating the packetized option for the U320 SCSI operation not only data but also SCSI

commands and messages in synchronous operation are transferred. These are transferred together with data in packages. With this more bus bandwidth for real data transmission are available. This

option is only for the U320 operation.

QAS

By the QAS (Quick Arbitration and Select) option the packages are transferred on the SCSI bus

without a bus free phase between the packages. As a result a higher throughput on the SCSI bus is achieved. This option is only for the U320 operation.

Initiate wide negotiation

This option determines whether the SCSI controller attempts 16-bit data transfer (Wide negotiation) instead of 8-bit data transfer. As a result two byte are transferred simultaneously via the SCSI bus

instead of one byte.

Enable disconnection

The default setting is Yes (enabled).

This permits SCSI devices to enable the SCSI bus during command execution.

A typical example of this is a tape device that has no need to access the SCSI bus during rewinding and can be "disconnected" from the SCSI bus for this period.

You can disable the function (No) if you have only connected one SCSI device. In this case, disabling disconnection improves performance slightly.

Send Start Unit Command

The default setting is Yes (enabled).

When this feature is enabled, the SCSI devices which support this function are not started by switching on the server until they receive a "Start Unit" command from BIOS of the U320 SCSI controller. (To do this the U320-SCSI controller BIOS must not be disabled).

This function is used to distribute the high starting currents of the SCSI devices over a specific period and to release the power supply of your server.

BIOS Multiple LUN Support

This option determines whether booting from a SCSI device that has multiple LUNs (Logical Unit Numbers) is supported. The default setting is No (disabled).

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Fujitsu D1419 technical manual Scsi Device Configuration

D1419 specifications

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