Sun Oracle Storage Tek T10000, Справочное руководство

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E20425-01 • Chapter 4 Commands 227
Space Command
Notes:
1. A zero in the Count field does not move tape.
2. If a filemark is encountered during a Space Blocks command, Check
Condition status is returned and the tape is positioned past the filemark.
The Valid and Filemark bits in the sense data are set and the Information
Bytes are set to the Count minus the actual number of blocks moved (not
counting the filemark).
3. If an end-of-data is encountered during any space command (except
space to end of data), Check Condition status is returned and the tape is
positioned after the last valid record.
For space blocks and filemarks, the Valid bit is set and the Information
Bytes contains the Count minus the actual number of blocks or filemarks
moved. The Sense Key is set to Blank Check. If the tape is positioned past
LEOT, EOM is also set.
4. A forward space into PEOT returns Check Condition status and sets the
EOM bit, and a sense key of Media Error. The information bytes contain
the count minus the actual number of blocks or filemarks moved.
5. A reverse space operation into BOT returns Check Condition, sets the
Valid and EOM bits, and sets the information bytes to the count minus the
actual number of blocks or filemarks moved.
6. A space to end of data positions the tape after the last block or filemark.
7. A Check Condition caused by early termination of any space command
does not result in a negative value in the information bytes.
8. A Reverse Space Operation of any type that does not complete
successfully returns the count in the information bytes as a positive
residual.