SCSI Commands
5-144
Quantum DLT 4000 Tape Drive
5.20
RESERVE UNIT COMMAND (16H)
The RESERVE UNIT command reserves the specified tape drive for exclusive use
by the requesting initiator or for another specified SCSI device.
Bit
Byte
7
6
5
4
3
2
1
0
0
Operation Code (16h)
1
Logical Unit Number
3rdPty
Third Party Device ID
Rsvd
2 - 4
Reserved
5
Unused
Reserved
Flag
Link
Figure 5–71 RESERVE UNIT Command Descriptor Block - Data Format
Table 5–69 RESERVE UNIT Command Data - Field Descriptions
Field Name
Description
3rdPty
The third party reservation option for RESERVE UNIT allows an initiator to
reserve a logical unit for another SCSI device. This option is intended for
systems that use COPY, and is implemented by the tape drive.
If set to 1, logical unit is reserved for the SCSI device whose ID appears in the
Third Party Device ID field. The tape drive ignores any attempt made by any
other initiator to release the reservation and returns a GOOD status.
If set to 0, no third party reservation is requested.
Third Party
Device ID
If 3rdPty is set to 1 (indicating that an initiator has reserved the logical unit for
another SCSI device), this field contains the ID number of that SCSI device for
which the reservation was made.
Summary of Contents for DLTtape DLT 4000
Page 1: ...DLT 4000 Tape Drive Product Manual November 10 2003 81 60043 04 ...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued ...
Page 6: ......
Page 24: ...About This Manual Quantum DLT 4000 Tape Drive xxiv ...
Page 62: ...Hardware Implementation 2 28 Quantum DLT 4000 Tape Drive ...
Page 100: ...Messages 4 12 Quantum DLT 4000 Tape Drive ...
Page 264: ...SCSI Commands 5 164 Quantum DLT 4000 Tape Drive ...
Page 274: ...Appendix B EEPROM Resident Bugcheck and Event Logs B 6 Quantum DLT 4000 Tape System ...
Page 280: ...Appendix C Updating the Firmware C 6 Quantum DLT 4000 Tape Drive ...
Page 298: ...Index Index 6 Quantum DLT4000 Tape Drive ...
Page 299: ......