Reserve Extended (56) - Fujitsu MAU3147RC SERIES Technical Manual

(2) Reserve right and third party reserve function
The third party reserve function is not supported by the drive.
If the 3rd Pty bit of CDB byte 1 is "0," the IDD is reserved for the INIT that has
issued this command. The INIT has the reserve right for the IDD.
If the 3rd Pty bit is "1," execution of this command is terminated with the
CHECK CONDITION status (ILLEGAL REQUEST [= 5]/Invalid field in CDB
[= 24-00]).

4.1.11 RESERVE EXTENDED (56)

Bit
Byte
0
1
2
3
4
5
6
7
8
9
Together with the RELEASE command, this command controls exclusive access
to the logical unit (IDD) under a multi-initiator environment.
C141-C009
7 6 5
0 0 0 3rd Pty
× × ×
Third Party Device ID
0 0 0
0 0 0
0 0 0
× × ×
× × ×
0 0 0
4.1 Control/Sense Commands
4 3 2
X'56'
0 0
× × ×
0 0 0
0 0 0
0 0 0
× × ×
× × ×
0 0 0
1 0
0 0
× ×
0 0
0 0
0 0
× ×
× ×
0 0
4-83