SCSI Receive Diagnostic Results Command
Encyclopedia
The SCSI Receive Diagnostic Results command is used to interrogate the results of a self-test. The self-test must have been triggered by a previous Send Diagnostic
command which would have defined the self-test required. This is usually associated with one of the available diagnostic pages
.
The CDB
structure for this command is:
SCSI Send Diagnostic Command
The SCSI Send Diagnostic command is used to instruct a target device to perform a self-test on a specific LUN. The CDB structure is:The special parameter fields in the CDB have the following meaning:*PF - Page Format:...
command which would have defined the self-test required. This is usually associated with one of the available diagnostic pages
SCSI diagnostic pages
SCSI target devices provide a number of SCSI diagnostic pages. These can be used by a Send Diagnostic command to tell a target device to run a specialised self-test. The Receive Diagnostic Results command is used where the results from the self-test operation are non-trivial.Most of the common...
.
The CDB
SCSI CDB
In SCSI computer storage, commands are sent in a Command Descriptor Block .Each CDB can be a total of 6, 10, 12, or 16 bytes, but later versions of the SCSI standard also allow for variable-length CDBs. The CDB consists of a one byte operation code followed by some command-specific parameters.A...
structure for this command is:
| bit→ ↓byte |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|
| 0 | Operation code = 1Ch | |||||||
| 1 | Reserved | PCV | ||||||
| 2 | PAGE CODE | |||||||
| 3–4 | Allocation length | |||||||
| 5 | Control | |||||||