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SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
5–163
5.30
RELEASE (6) Command (17h)
The RELEASE and the RESERVE commands are used for contention resolution in
multiple-initiator systems. The RELEASE command is used to release a previously
reserved logical unit. The drive will not return an error if the initiator attempts to
release a reservation that is not currently valid.
Bit
Byte
7
6
5
4
3
2
1
0
0
Operation Code (17h)
1
Reserved
3rdPty
Third Party Device ID
Extent
2
Reservation Identification
3 - 4
Reserved
5
Control
Figure 5–78 RELEASE (6) Command Descriptor Block — Data Format
Table 5–77 RELEASE (6) Command — Field Descriptions
Field
Description
3rdPty
Third Party Release allows an initiator to release a logical unit that
was previously reserved. If the value in this field is 0, third party
release is not requested.
When the value is 1, the drive releases the specified logical unit, but
only if the reservation was made by the initiator using a third-party
reservation that requested the release for the same SCSI device as
specified in the Third Party Device ID field.
Third Party Device ID
Required if the 3rdPty bit is 1. This field specifies the SCSI ID (0
through 7 only) of the initiator whose third party reservation is
being released. (This field must be set if the initiator of the original
third party RESERVE is the source of the RELEASE.)
Extent
The drive supports reservations only on entire logical units.
The
value must be 0.
Reservation Identification
Any value in this field is ignored by the drive.
NOTE:
Assuming that the RELEASE Command Descriptor Block is valid, the drive always returns a
GOOD status for this command. An actual release only happens if the initiator has the unit
reserved for itself or a third-party initiator.
Summary of Contents for Quantum Atlas 10K II 9.2/18.4/36.7/73.4 GB
Page 15: ...Contents Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives xv...
Page 19: ...Contents Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives xix...
Page 25: ...About This Manual 1 4 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 55: ...Installation 3 28 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
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Page 315: ...Feature Descriptions 6 14 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 321: ...Appendix A Quick Reference A 6 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 363: ...Appendix B SCSI Bus Signal Timing B 42 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 369: ...Index I 4 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
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