RE: [PATCH V3 1/4] Encapsulate scsi_do_report_luns

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So far the T10 Base feature set proposal has not been restating requirements already required by the core standards - it's just upgrading "mays" and "shoulds" to "shalls".  Should we also include a list of "shall" rules like this that have had known violations in the past?


> -----Original Message-----
> From: James Bottomley [mailto:James.Bottomley@xxxxxxxxxxxxxxxxxxxxx]
> Sent: Thursday, 07 March, 2013 11:31 AM
> To: Elliott, Robert (Server Storage)
> Cc: Jeremy Linton; Rob Evers; linux-scsi@xxxxxxxxxxxxxxx;
> michaelc@xxxxxxxxxxx; bvanassche@xxxxxxx; emilne@xxxxxxxxxx
> Subject: Re: [PATCH V3 1/4] Encapsulate scsi_do_report_luns
> 
> On Thu, 2013-03-07 at 17:01 +0000, Elliott, Robert (Server Storage)
> wrote:
> > Good point; INQUIRY, REPORT LUNS, REQUEST SENSE, and NOTIFY DATA
> > TRANSFER DEVICE do not report unit attention conditions.
> 
> Well, yes they do, at least on several devices I have here.
> 
> Can I point out again that we can't code to SAM ... we have to code to
> what already exists. SAM is useful as a guideline, but it isn't gospel.
> In particular where the real world does something SAM says it shouldn't
> (like sending UA to INQUIRY), we have to go with the real world.
> 
> This also means we can't go through the linux SCSI subsystem changing
> behaviour based on what SAM says the behaviour should be.  Most of what
> the SCSI subsystem does is an accumulation based on years of trying to
> fix it for annoying and out of spec devices.
> 
> James
> 

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