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 SCSI devices such as disk-drives support only one or two diagnostic pages. SES devices can support many diagnostic pages.
Read more about SCSI Diagnostic Pages: List of SCSI Diagnostic Pages
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