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Command Specifications
3 - 40 C141-E167
• INIT #A can issue INQUIRY, REQUEST SENSE, RELEASE and RESERVE commands
to TARG #0, but other commands are rejected with a RESERVATION CONFLICT status.
A RELEASE or RELEASE EXTENDED command issued by INIT #A releases TARG #0's
reserved state. Also, a RESERVE or RESERVE EXTENDED command changes the
reserve state of TARG #0.
• Commands issued by INIT #B to TARG #0 are rejected with a RESERVATION
CONFLICT status, except the INQUIRY, REQUEST SENSE and RELEASE commands. A
RELEASE command is terminated normally, but it has no influence on the TARG #0
reserve right.
3. An example of the third party reserve function is applicable when using the COPY command.
For example, TARG/INIT #1 supports the COPY command, uses the COPY command and in
the case that a data transfer between TARG #0 and TARG/INIT#1 is executed, if the third party
reserve in 2) is executed before INIT #A issues a COPY command to TARG/INIT #1, access to
TARG #0 by INIT #B during execution of the COPY command can be prohibited.
3.1.12 RESERVE EXTENDED (56)
Bit
Byte
76543210
0 X‘56’
1 LUN 3rdPty0000
2
××××××××
3 Third Party Device ID
4 00000000
5 00000000
6 00000000
7
××××××××
8
××××××××
9 0000000Link
This command controls exclusive access to a logical unit (IDD) under a multi-initiator environment
together with the RELEASE and RELEASE EXTENDED commands.
The IDD is reserved by the INIT that issued this command or for another SCSI device specified in
the CDB.
The functions of this command are the same as for the Group 0 RESERVE command (Section
3.1.11), except that it is possible to specify the third party reserve function to SCSI devices with
SCSI IDs 15 to 8.