User's Guide

Chapter 2 Media Changer Commands
Reserve Element (6) Command (16h)
Quantum SuperLoader 3 Software Interface Guide 133
Reserve Element (6) Command (16h)
The RESERVE ELEMENT command reserves the specified media changer
for exclusive use by the requesting initiator or for another specified SCSI
device. Element reservations are not supported.
Third party reservations are not supported by this command. The
Reserve Element (10) must be used instead.
Figure 78 Reserve Element (6)
Descriptor
A reservation via the RESERVE ELEMENT command remains in effect
until one of the following conditions is met:
• The initiator that made the reservation sends another
RESERVE
ELEMENT
command.
• The device is released via a
RELEASE ELEMENT command from the
same initiator.
•A
BUS DEVICE RESET message is received from any initiator.
• A hard reset occurs.
The occurrence of the last two conditions is indicated by the media
changer returning a
CHECK CONDITION status, sense key of UNIT
ATTENTION
on the next command following the condition. It is not an
error to issue a
RESERVE ELEMENT command to a media changer that is
currently reserved by the requesting initiator.
Bit
Byte76543210
0
Operation Code (16h)
1
Logical Unit Number Obsolete Rsv’d
2 - 4
Reserved
5
Unused Reserved Flag Link