| SET DEVICE IDENTIFIER | A4h |
SET 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.
Illegal Field Reservation Deferred Error Unit Attention
Command descriptor block:
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| 7 |
| 6 | 5 | 4 |
| 3 | 2 | 1 | 0 |
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| 0 |
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| Operation | Code (A4h) |
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| 1 |
| Reserved (0) |
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| Service Action (06h) |
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| 6 | (MSB) |
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| Parameter List Length |
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| 9 |
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| 10 |
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| 11 |
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| Control |
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CDB fields:
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.
Data
The format of the Device Identifier supplied in the Parameter List is as follows:
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| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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| 0 | (MSB) |
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| Identifier |
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| n |
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Commands
SET DEVICE IDENTIFIER A4h 171