Quantum DLT 8000 Instrukcja Obsługi Pobierz pdf (Strona 332)

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101

SCSI Commands

5-188 Quantum DLT 8000 Tape System

REQUEST SENSE Command (03h) (continued)

The REQUEST SENSE command causes the tape drive to transfer detailed sense data to

the initiator.

The sense data is valid for a CHECK CONDITION or RESERVATION CONFLICT

status returned on the previous command. The sense data bytes are preserved by the tape

drive until retrieved by a REQUEST SENSE command, or until the receipt of any other

command from the same initiator, though some commands, such as INQUIRY, do not

change sense data.

If the tape drive receives an unsolicited REQUEST SENSE, it returns sense data with

the appropriate values in the End of Media (EOM), Sense Key, Additional Sense Code,

and Additional Sense Code Qualifier. The positional information provided reflects the

logical position of the tape drive. The tape drive returns information based on the non-

diagnostic data in its buffer as well as the data on tape medium. Additionally, bytes 25

through 28 contain the amount of tape to be written in 4 KB blocks.

REQUEST SENSE does not cause the drive to flush its buffered data to tape. Therefore,

if the host requires the exact physical positioning of the tape medium, it should precede

the REQUEST SENSE command with a WRITE FILEMARKS command with length 0

(Immed=0) specified. This forces the tape drive to flush any currently-buffered data to

tape. A subsequent REQUEST SENSE command returns the actual physical (and

logical) position of the tape drive to the initiator.

The following illustration portrays the format of REQUEST SENSE DATA.

1 2 ... 327 328 329 330 331 332 333 334 335 336 337 ... 407 408

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