SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
5–119
PERSISTENT RESERVATION IN Command (5Eh) (continued)
Table 5-56 presents the definitions of the characters of the available “Type” values from the Type
field of the PERSISTENT RESERVATION IN Read Reservations parameters.
Each of the codes provides handling instructions for READ operations, for WRITE operations,
and for subsequent attempts to establish persistent reservations (referred to as “Additional
Reservations Allowed” in the table).
Table 5–56 Persistent Reservation Type Codes and Their Meanings
Code
Name
Description
0h
READ Shared
READS: Shared; any application client on any initiator may execute
commands that perform transfers from the disk to the initiator.
WRITES: Prohibited; any command from any initiator that performs a
transfer from the initiator to the disk results in a reservation
conflict.
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the
logical unit, extents, or elements as long as
the persistent reservations do not conflict
with any reservations already known to the
device server.
1h
WRITE Exclusive
READS: Shared; any application client on any initiator may execute
commands that perform transfers from the disk to the initiator.
WRITES: Exclusive; any command from any initiator other than the
initiator that holds the persistent reservation that attempts a
transfer to the disk results in a reservation conflict
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the
logical unit, extents, or elements as long as
the persistent reservations do not conflict
with any reservations already known to the
device server.
2h
READ Exclusive
READS: Exclusive; any command from any initiator other than the initiator
that holds the persistent reservation that attempts a transfer from
the disk results in a reservation conflict
WRITES: Shared; any application client on any initiator may execute
commands that perform transfers to the disk from the initiator.
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the
logical unit, extents, or elements as long as
the persistent reservations do not conflict
with any reservations already known to the
device server.
(continued)
Summary of Contents for Quantum Atlas 10K II 9.2/18.4/36.7/73.4 GB
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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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