OSD: Error Reporting

Ralph Weber roweber at IEEE.org
Wed Aug 20 05:04:56 PDT 2008

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For consistency, the cited OSD-2 4.16.1 text needs to be modified
to provide the same exceptions as the text after table 24 in SPC-4.
SPC-3 needs to change to SPC-4, and there may be some other minor editorial
nits, but ...
The entire Deferred Error gambit is a red herring.
None of the text after SPC-4 table 24 applies to Deferred Errors.
item listed after table 24 is MODE PARAMETERS CHANGED. Furthermore,
I doubt that T10 will approve adding more special cases to this list.
OSD-2 can (and shall) report Deferred Errors in the descriptor format.
OSD-2 devices should reject all REQUEST SENSE commands with the DESC
bit set to zero. The response to a REQUEST SENSE command with DESC set
to one should be descriptor format sense data ... unless otherwise
specified. This may reflect a problem in SPC-4 r16 table 250, but
that problem is an SPC-4 issue, not an OSD-2 issue.
All the best,
Eddy Quicksall wrote:
> Paragraph 4.16.1 of osd2r04 says "OSD logical units shall use 
> descriptor format sense data (see SPC-3) to report all errors".
> From SPC4r16, DESC == 0 means "The device server shall return fixed 
> format sense data (see
> 4.5.3) in the parameter data."
> If the initiator issues a request sense but sets DESC to 0 then should 
> the target report ILLEGAL REQUEST / INVALID FIELD IN CDB? (note that 
> there could be a Deferred Error to report).
> Also the sentence following Table 24 of spc4r16 says "The RESPONSE 
> CODE field shall be set to 70h in all unit attention condition sense 
> data in which (a) the ADDITIONAL SENSE CODE field is set to 29h or 
> ..." but since it is OSD then there is a conflict.
> Eddy

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