Question: Deferred Sense reporting priority

Terry L. Spear terrys at
Thu Apr 23 16:20:24 PDT 1998

* From the T10 (formerly SCSI) Reflector (t10 at, posted by:
* "Terry L. Spear" <terrys at>
Does anyone know of a reference in the standards that addresses this
implementation issue:

When implementing a target device that supports Deferred Sense, an
algorithm must be chosen that fixes a priority scheme as to the order in
which the following "conditions", if simultaneously present, are reported
to the initiator by a target: Contingent Allegiance, Unit Attention(s), and
Deferred Sense.

While I believe the proper reporting priority is:
	Contingent Allegiance, Deferred Sense, Unit Attention(s)

I have yet to find a clear statement to this fact in any SCSI-3 standards

What have other implementors done?


Terry L. Spear(terrys at	Breakthrough Systems Inc.
303-661-0355					12400 Arapahoe Road
303-661-9707 (fax)				Lafayette, CO  80026
SCSI Target Firmware, Test Suites, Host Drivers, Applications
* For T10 Reflector information, send a message with
* 'info t10' (no quotes) in the message body to majordomo at

More information about the T10 mailing list