Reserve Unit Command; Table 195 Reserve Unit 6-Byte Command Descriptor Block - Data Format - Quantum LTO 2 User Manual

RESERVE UNIT Command

Table 195 RESERVE UNIT
6-Byte Command Descriptor
Block — Data Format
LTO-2 SCSI Interface Guide
The command reserves the drive for exclusive use of the
RESERVE UNIT
requesting Initiator.
The drive reservation once established, remains in effect until one of the
following occurs:
• Another
RESERVE UNIT
that requested the current reservation. The new reservation
supersedes the current one and may be the same as the current one.
Redundant use of the command is not considered an error.
• A
RELEASE UNIT
requested the current reservation. The drive returns to unreserved
mode.
• A Bus Device Reset message (Parallel SCSI interface) or Target Reset
or Logical Unit Reset task management request arrives from any
Initiator.
• A Reset condition occurs.
• Firmware is updated.
When the drive is reserved, it returns Reservation Conflict Status in
response to most commands received from excluded Initiators.
,
REQUEST SENSE PREVENT MEDIUM REMOVAL
zero), and
RELEASE UNIT
Bit
7
Byte
0
Ignored LUN
1
2
3
4
5
command arrives from the same Initiator
command arrives from the same Initiator that
commands are accepted from any initiator.
6 5 4
Operation Code (16h)
Reserved
Reserved
Reserved
Control
Chapter 2 SCSI Commands
RESERVE UNIT Command
INQUIRY
(with a prevent bit of
3 2 1
Reserved
2
,
0
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