Reserve; Command Description - Tandberg Data SLR7-140 PROGRAMMER Manual

24.

Reserve

24.1. Command Description

The RESERVE command will reserve the Drive exclusively
for the requesting Initiator or another specified SCSI
device.
The reservation will remain in effect until superseded
by another RESERVE command from the Initiator that made
the reservation or until released by a RELEASE command
from the same Initiator, or a BUS DEVICE RESET message
from any Initiator, or a SCSI-bus reset condition. It
will not be an error to issue this command to the Drive
if it is currently reserved to the requesting Initiator.
If the Drive
Initiator, then
CONFLICT status.
If, after honoring the reservation, any other Initiator
subsequently attempts
INQUIRY, REQUEST
(with a prevent bit of zero) or RELEASE, the command
will be rejected with RESERVATION CONFLICT status. A
RELEASE command
ignored by the reserved Drive.
The third-party reservation option allows an Initiator
to reserve the
option is intended for use in multiple-initiator systems
that use the COPY command.
If the third-party
setting the 3RD bit), then the RESERVE command will
reserve the Drive for the SCSI device specified in the
third-party device ID field (3RD Party ID). The Drive
will preserve
another RESERVE command from the Initiator that made the
reservation or until released by the same Initiator, by
a BUS DEVICE RESET message from any Initiator, or by a
SCSI-bus reset condition. The Drive will ignore (i.e.,
return GOOD status)
Initiator to release the reservation.
An Initiator that holds a current reservation may modify
that reservation (e.g., switch third-parties) by issuing
another RESERVE command to the Drive. The superseding
RESERVE command will release the previous reservation
state only when the new reservation is granted.
If disconnection
disconnect when executing this command if the previous
command was an immediate type command.
24-1 Tandberg SLR Product Line SCSI Functional Specifications
is previously
the Drive will
to perform
SENSE, PREVENT
issued by another
Drive for another
reservation
the reservation
any attempt
is allowed,
reserved by another
return RESERVATION
any command
ALLOW MEDIUM REMOVAL
Initiator will
SCSI device.
option is used
until superseded
made by any
the Drive will
except
be
This
(by
by
other
only