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4.1 Control/Sense Commands
C141-C013 211
4.1.21 SET DEVICE IDENTIFIER (A4)
Bit
Byte
7 6 5 4 3 2 1 0
0 X'A4'
1
0 0
0 Service Action (X' 06')
2
0 0 0 0 0 0 0
0
3
0 0 0 0 0 0 0
0
4
0 0 0 0 0 0 0
0
5
0 0 0 0 0 0 0
0
6 Parameter List Length (MSB)
7 Parameter List Length
8 Parameter List Length
9 Parameter List Length (LSB)
10
0 0 0 0 0 0 0
0
11 0 0
0 0 0
0
0
0
This command requests that the device identifier information in the logical unit be
set to the value received in the SET DEVICE IDENTIFIER parameter list.
On successful completion of this command a unit attention shall be generated for
all initiators except the one that issued the service action. When reporting the unit
attention condition the additional sense code shall be set to DEVICE
IDENTIFIER CHANGED.
The "Service Action" field can be specified only X'06'.
The "Allocation Length" field specifies the length in bytes of the Identifier that
shall be transferred from the application client to the device server. The maximum
value for this field shall be 512 bytes. A parameter list length of zero indicates
that no data shall be transferred, and that subsequent REPORT DEVICE
IDENTIFIER commands shall return an Identifier length of zero. Logical units
that implement this command shall be capable of accepting a parameter list length
of 512 bytes or less. If the parameter list length exceeds 512 bytes and the logical
unit is not capable of storing the requested number of bytes, then the device server
shall return CHECK CONDITION status (ILLEGAL REQUEST [=5] / Invalid
field in CDB [=24-00]).
The SET DEVICE IDENTIFIER parameter lists are shown in Table 4.35.