Date: Sat, 4 Mar 2000 16:29:27 -0700 From: "Kenneth D. Merry" <ken@kdm.org> To: "Justin T. Gibbs" <gibbs@FreeBSD.ORG> Cc: Mike Smith <msmith@FreeBSD.ORG>, scsi@FreeBSD.ORG Subject: Re: chio trap with not-ready changer Message-ID: <20000304162927.A61483@panzer.kdm.org> In-Reply-To: <200003042325.QAA24066@caspian.plutotech.com>; from gibbs@FreeBSD.ORG on Sat, Mar 04, 2000 at 04:25:57PM -0700 References: <20000304161054.A61108@panzer.kdm.org> <200003042325.QAA24066@caspian.plutotech.com>
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On Sat, Mar 04, 2000 at 16:25:57 -0700, Justin T. Gibbs wrote:
> >Oooh, I think I know what may be going on here. I suspect you're hitting
> >the following case in cam_periph_error():
> >
> > } else {
> > /* decrement the number of retries */
> > retry = ccb->ccb_h.retry_count > 0;
> > if (retry)
> > ccb->ccb_h.retry_count--;
> > /*
> > * If it was aborted with no
> > * clue as to the reason, just
> > * retry it again.
> > */
> > error = ERESTART;
> > }
> >
> >You hit that when there is a SCSI error, but autosense failed, and there
> >are still retries left.
>
> If the autosense failed, the system would not print out "Unit Attention...".
> You have to have sense information for that.
The sense information that Mike included in his mail was from some
debugging stuff I told him to put in the driver.
Also, the changer driver prints out SCSI sense information if the CAM
status is CAM_SCSI_STATUS_ERROR. It doesn't check the CAM_AUTOSNS_VALID
status bit.
My guess is that the drive is sending back sense information, but maybe
it's sending it back with check condition set?
> >I'll think about it and run it by Justin (CCed) as well. You might make
> >an ideal beta tester for his error recovery code rewrite. :) (I don't
> >know if it's ready for testers just yet, though.)
>
> I think it is in good enough shape to send out. I just need to verify
> one more thing.
Cool.
> >One of the things I think he's planning on doing is issuing a request sense
> >when autosense fails. I'm not sure how much that would help in this case,
> >but it might.
>
> Yes, it does perform sense retrieval in that case.
That might help.
Ken
--
Kenneth Merry
ken@kdm.org
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