Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 315)

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25.4 Data Buffering

The CTS provides two modes of operation for the WRITE command:

unbuffered and buffered. The mode of operation is set with the

MODE SELECT command (byte 02, bits 6 through 4, in the Parameter

List Header).

Unbuffered Write Operation

When the CTS is set for an unbuffered write operation, it returns

Good status as soon as all data blocks are written to tape.

Buffered Write Operation

When the CTS is set for a buffered write operation, it returns Good

status as soon as all data blocks are successfully transferred to the

buffer. The data in the buffer is written to tape when one of the

following conditions occurs:

The motion threshold is reached during a WRITE command (see

Section 3.6).

The CTS receives one of the following commands:

•

REWIND (01h)

•

WRITE FILEMARKS (10h) non-immediate

•

SPACE (11h) in either direction

•

ERASE (19h)

•

LOAD/UNLOAD (1Bh)

•

LOCATE (2Bh) in the reverse direction

The operator presses the unload button.

The time specified for the Write Delay Time field in the MODE

SELECT command elapses (note, however, if the Write Delay

Time field is 0, a partially full buffer is not flushed to tape). See

Section 10.12 for more information about the Write Delay Time

field.

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

25-5

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