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28 WRITE (0Ah)
2. The initiator issues a sixth buffered WRITE command to the EXB-8500
(WRITE 6). The 100 KBytes of data associated with this command
exceeds the motion threshold and causes the EXB-8500 to re-tension the
tape.
The EXB-8500 returns Good status to the initiator, indicating that the
command completed successfully.
3. While the tape is being re-tensioned, the initiator issues two more
buffered WRITE commands to the EXB-8500 (WRITE 7 and WRITE
8). The data associated with these commands is transferred to the
EXB-8500’s buffer; however, none of the data in the buffer has been
written to tape yet.
These commands also receive Good status.
4. After the tape is re-tensioned, the data associated with the first two
WRITE commands (WRITE 1 and WRITE 2) is transferred from the
buffer to tape.
5. As the EXB-8500 writes the data associated with WRITE 2 to tape, it
encounters LEOT. As a result, the next WRITE command (WRITE 9)
terminates abnormally and receives Check Condition status. The
extended sense data is set as follows:
❏
❏
❏
❏
❏
❏
❏
Valid = 1
Error Code = 71h (error associated with previous command)
EOM = 1
Sense Key = 0h (No Sense)
Information bytes = requested transfer length
ASC and ASCQ = 00h 00h. This indicates that no error occurred, but
the initiator should note that PEOT is closer than would otherwise be
expected. See “Important” on the previous page.
LBOT = 0.
6. The remaining data in the buffer (from WRITE 3 through WRITE 8) is
written to tape. Thus, the tape is between 600 and 700 KBytes closer to
PEOT than it would be if LEOT had been encountered during the current
write operation.
WRITE Command Issued after LEOT Encountered
Issuing a WRITE command after LEOT is encountered causes the EXB-8500
to go into unbuffered mode and to return Check Condition status after all of
the data is written to tape. The EOM bit is set to 1 and the LBOT bit is set to 0
in the extended sense data, with the sense key set to No Sense. The Valid bit
is not set, which indicates that all data was written to tape.
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