Quantum DLT 7000 Manuel télécharger pdf (Page 273)

SCSI Commands

Quantum DLT 7000 Tape System 5-169

WRITE Command (0Ah) (continued)

Table 5–82 WRITE Command Data — Field Descriptions (continued)

Field Name Description

Fixed (cont.) When the Fixed bit is 1, the Transfer Length field specifies the number of blocks to

be transferred to the host beginning at the current tape position. This form of WRITE

is valid only if the logical unit is currently operating in the Fixed Block mode – when

it has been instructed to use fixed-length blocks with MODE SELECT. The current

block length is the block length defined in the MODE SELECT command. Upon

termination, the tape is logically positioned after these blocks.

Transfer

Length

This field contains the length of the data transfer in bytes or blocks depending on

whether Fixed or Variable block mode is selected.

When the Transfer Length is 0, no data is transferred and the current position on the

logical unit is not changed.

Exception Conditions

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

any buffered data. The command terminates with CHECK CONDITION status.

Within the sense data, the EOM bit is set, the Sense Key is set to NO SENSE,

and the Additional Sense code and Additional Sense Code Qualifier fields are set

to EOM/P detected. The drive attempts to complete any subsequent writes,

returning a CHECK CONDITION status in each case.

If the tape drive encounters the physical End of Medium (EOM) when

attempting WRITE, a CHECK CONDITION status is returned. Within the sense

data, the EOM and Valid bits are set, and the Sense Key field is set to Volume

Overflow. The Information fields contain the residue count and the Additional

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

Detected. The tape is physically positioned at EOM/P.

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Quantum DLT 7000 Manuel Page 273