Messages
Quantum DLT 8000 Tape System
4-5
4.2
Supported SCSI Messages
Following are descriptions of each of the messages supported by the drive.
4.2.1 ABORT Message (06h)
This message is sent from the initiator to the target to clear the current I/O process on
the selected unit. Buffered (cached) write operations are completed if possible. The target
goes directly to the BUS FREE phase after successful receipt of this message. Current
settings of MODE SELECT parameters and reservations are not affected. Commands,
data, and status for other initiators is not affected.
This message can be sent to a logical unit that is not currently performing an operation
for the initiator. If no unit has been selected, the target goes to BUS FREE phase and no
commands, data, or status on the target are affected.
4.2.2 BUS DEVICE RESET Message (0Ch)
The BUS DEVICE RESET message is sent from an initiator to direct the drive to clear all
I/O processes on the drive. The message causes the drive to:
1. Flush the contents of cache to tape and go to the BUS FREE phase.
2. Execute a hard reset, leaving it as if a Bus Reset had occurred.
The drive creates a Unit Attention condition for all initiators after accepting and
processing a Bus Device Reset message. The additional sense code is set to POWER ON,
RESET, or BUS DEVICE RESET OCCURRED.
4.2.3 COMMAND COMPLETE Message (00h)
The COMMAND COMPLETE message is sent by the drive to an initiator to indicate
that an I/O process has completed and that valid status has been sent to the initiator.
After successfully sending this message, the drive goes to the BUS FREE phase by
releasing the BSY signal. The drive considers the message transmission successful when
it detects the negation of ACK for the COMMAND COMPLETE message with the ATN
signal false. If a COMMAND COMPLETE message is received by the tape drive, it is
handled as an illegal message: the drive returns MESSAGE REJECT and enters its
STATUS phase, reporting CHECK CONDITION with the sense key set to COMMAND
ABORTED.
Summary of Contents for DLTtape DLT 8000
Page 1: ...DLTTM 8000 Tape System Product Manual Nov 10 2003 81 60118 06...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued...
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Page 26: ...Table of Contents xxiv Quantum DLT 8000 Tape System...
Page 36: ...About This Manual Quantum DLT 8000 Tape System xxxii...
Page 54: ...General Description and Specifications 1 18 Quantum DLT 8000 Tape System...
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Page 376: ...Appendix A Definition of Vendor Unique Sense Data Information A 4 Quantum DLT 8000 Tape System...
Page 386: ...Appendix C Updating the Firmware C 6 Quantum DLT 8000 Tape System...
Page 396: ...Appendix E Visual Inspection Procedure for DLTtape Cartridges E 8 Quantum DLT 8000 Tape System...
Page 406: ...Appendix G DLT 7000 Emulation Feature G 8 Quantum DLT 8000 Tape System...
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