SAM requirements for ACA on unsupported logical unit?

Gerry_Houlder at Gerry_Houlder at
Mon Nov 15 15:03:10 PST 1999

* From the T10 Reflector (t10 at, posted by:
* Gerry_Houlder at
The only thing you have "missed" is that the standard doesn't allow any
exception for commands directed to unsupported LUNs. My reading of the standard
paragraphs you quote require the setting of an ACA (not a CA like you describe)
when NACA=1. I think the target should act like the standard says. If initiators
don't like this behavior, they can simply use NACA=0 until they are sure the
target actually supports the LUN in question. Or we can change the standard.

Feel free to propose wording changes to describe you desired behavior.

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