Set device identifier a4h, Pre-execution checks, Command descriptor block – HP Q153090901 User Manual
Page 171: Cdb fields, Data
SET DEVICE IDENTIFIER A4h
C
omm
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ds
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SET DEVICE IDENTIFIER
A4h
S
ET DEVICE IDENTIFIER
allows a initiator to set the Device ID information to that supplied in the
Parameter List. This information can be later retrieved by the
REPORT DEVICE IDENTIFIER
command.
Upon successful completion the command will post sense key
UNIT ATTENTION
with additional
sense of 3F05h (device identifier changed) to all initiators except the one that issued the
command. Once set the Device Identifier will only be cleared by a successful Set Device Identifier
command or a drive reset.
Pre-execution checks:
Command descriptor block:
CDB fields:
Data
The format of the Device Identifier supplied in the Parameter List is as follows:
Illegal Field
Reservation
Deferred Error
Unit Attention
7
6
5
4
3
2
1
0
0
Operation Code (A4h)
1
Reserved (0)
Service Action (06h)
2–5
Reserved (0)
6
(MSB)
Parameter List Length
9
(LSB)
10
Reserved (0)
11
Control
Service Action
Must be 06h
Parameter List Length The length in bytes of the Device Identifier to be set. If the value exceeds 64,
CHECK CONDITION is returned with additional sense of 2400h (invalid field in
CDB).
0 Not an error, but clears any previously stored Device ID.
7
6
5
4
3
2
1
0
0
(MSB)
Identifier
n
(LSB)