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SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands
81-81200-02 REV A01 January 2005 4-141
3h Exclusive
Access
READS: Exclusive; any command from any initiator other than the
initiator holding the persistent reservation that attempts a transfer from
the drive results in a reservation conflict.
WRITES: Exclusive; any command from any initiator other than the
initiator holding the persistent reservation that attempts a transfer to the
drive results in a reservation conflict.
ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT
RESERVE OUT command with the Reserve service action from any
initiator other than the initiator holding the persistent reservation
results in a reservation conflict. The initiator that holds the persistent
reservation can reserve the logical unit, extents, or elements as long as
the persistent reservations do not conflict with any reservations already
known to the drive.
4h Obsolete ---
5h WRITE
Exclusive
Registrants
Only
READS: Shared; any application client on any initiator may execute
commands that perform transfers from the drive to the host.
WRITES: Exclusive; any command from an initiator that has not
previously performed a Register service action with the drive that
attempts a transfer to the drive results in a reservation conflict.
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve
the logical unit, extents, or elements as long as the persistent
reservations to not conflict with any reservations already known to the
drive.
6h Exclusive
Access
Registrants
Only
READS: Exclusive; any command from an initiator that has not
previously performed a Register service action with the drive that
attempts a transfer from the drive results in a reservation conflict.
WRITES: Exclusive; any command from an initiator that has not
previously performed a Register service action with the drive that
attempts a transfer to the drive results in a reservation conflict.
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve
the logical unit, extents, or elements as long as the persistent
reservations to not conflict with any reservations already known to the
drive.
7h -
Fh
Reserved Not applicable.
Table 4-81. PERSISTENT RESERVATION IN Type Codes (Continued)
Code Name Description
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