Quantum DLT 8000 Handbuch PDF herunterladen (Seite 371)

SCSI Commands

Quantum DLT 8000 Tape System 5-227

WRITE FILEMARKS Command (10h) (continued)

Table 5–103 WRITE FILEMARKS Command Data — Field Descriptions

Field Name Description

WSmk Write Setmark. Must be 0. This tape drive does not support Setmarks.

Immed Immediate. When this bit is set to 1, the tape drive returns status as

soon as the Command Descriptor Block (CDB) has been validated,

unless the Filemark count is 0, or greater than 1 (since either

condition causes the WRITE buffer to be flushed to tape medium).

When set to 0, this bit indicates the status will not be returned until

the operation is complete.

Number of Filemarks This field contains the number of consecutive Filemarks to be written

to tape medium. A value of 0 is not considered to be an error; GOOD

status is returned.

The WRITE FILEMARKS command may be used to force the tape drive to write any

buffered WRITE data to the tape medium. If the tape drive is in buffered mode, and

WRITE FILEMARKS is received, the requested filemarks are appended to the data and

the WRITE buffer contents are flushed to tape medium. A value of 0 in the Number of

Filemarks field indicates that no filemarks are to be written to the tape medium, but still

flushes any WRITE data to the tape medium.

If End of Tape (EOT) is detected while writing filemarks, the tape drive finishes writing

any buffered data and terminates with CHECK CONDITION status. Within the Sense

data, the End of Medium (EOM) bit is set, the Sense Key field is set to NO SENSE and

the Additional Sense Code and Additional Sense Code Qualifier fields are set to EOM/P

DETECTED. The tape drive attempts to complete any subsequent WRITE FILEMARKS,

returning a CHECK CONDITION status in each case. If the tape drive encounters the

physical EOM when attempting a WRITE FILEMARKS, it returns CHECK

CONDITION status.

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Quantum DLT 8000 Handbuch Seite 371