Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 98)

Reset Processing

This section specifies how the CTS processes power-on resets, SCSI

bus resets, and device resets. The CTS processes resets differently

depending on whether a data cartridge is present or not.

Data Cartridge Present before Reset

If a data cartridge is present before the reset occurs, the tape is

rewound, unloaded, and reloaded. When the reset is complete, the

tape is positioned at LBOT and the CTS is ready to process tape

motion commands.

When a data cartridge is present, the CTS responds to the reset as

follows:

It returns Check Condition status to the first command received.

The sense key is set to Unit Attention (6h), and the Additional

Sense Code (ASC) and Additional Sense Code Qualifier (ASCQ)

fields indicate that a reset occurred.

It processes all non-motion commands. The default status

returned by the TEST UNIT READY (00h) command is Check

Condition status with the sense key set to Not Ready (2h). The

ASC and ASCQ fields indicate that the device is becoming ready.

An EEPROM option is available to control how the CTS handles tape

motion commands during reset and load operations (see the

“Command queuing” option on page A-22). Depending on the CTS’s

EEPROM image, the CTS performs one of the following actions when

it receives tape motion commands during a reset or load operation:

It queues (holds) one tape motion command (and disconnects, if

allowed) until the reset operation is complete and the tape is

loaded. Once the load is complete, it processes the queued

command.

It returns Busy status.

It returns Check Condition status with the sense key set to Not

Ready.

If the tape is already rewound when the reset occurs, the reset takes

about one minute to complete. Additional time is required if the CTS

needs to rewind the tape.

3-36

EXB-8205 and EXB-8505

(Standard and XL)

510503

3 Implementing CTS Operations

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Exabyte EXB-8205 Instruções de Operação Página 98