Date: Thu, 16 Nov 2006 10:38:42 -0700 From: "Kenneth D. Merry" <ken@kdm.org> To: Matthew Jacob <lydianconcepts@gmail.com> Cc: freebsd-scsi@freebsd.org, mjacob@freebsd.org Subject: Re: amusing stumble for the 6 to 10 byte checking code Message-ID: <20061116173842.GB64023@nargothrond.kdm.org> In-Reply-To: <7579f7fb0611160836t655c8100j31e300a37c0cc9dc@mail.gmail.com> References: <20061115211433.R8053@ns1.feral.com> <20061116061158.GA37070@nargothrond.kdm.org> <7579f7fb0611160836t655c8100j31e300a37c0cc9dc@mail.gmail.com>
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On Thu, Nov 16, 2006 at 08:36:15 -0800, Matthew Jacob wrote: > >That shouldn't have happened in response to a unit attention. It should > >only happen if the SIM comes back with CAM_REQ_INVALID, or if the target > >comes back with an illegal request sense code. So there may have been > >another intervening error that caused the switchover. > > Yeah- but where? I dunno. I just took a quick look through CAM and the ISP driver for CAM_REQ_INVALID, and didn't see any obvious place that would return CAM_REQ_INVALID for a 6 byte write... Computers are causal, though, so I'm sure there's a reason in there *somewhere*... > >> (da0:isp1:0:0:0): WRITE(10). CDB: 2a 0 0 8 68 90 0 0 80 0 > >> (da0:isp1:0:0:0): CAM Status: SCSI Status Error > >> (da0:isp1:0:0:0): SCSI Status: Check Condition > >> (da0:isp1:0:0:0): ILLEGAL REQUEST asc:24,0 > >> (da0:isp1:0:0:0): Invalid field in CDB > >> (da0:isp1:0:0:0): Unretryable error > > > >Hmm. Illegal field, and not invalid command operation code? That's odd. > >What kind of drive is this? The CDB looks valid at first glance... > > > > Yeah, this is what's puzzling me. This is a normal FC drive. Puzzled... Yeah, definitely a weird error. I'd never expect a SCSI drive to reject a normal 10 byte write like that. There are no weird flags in the CDB, and the lba and length don't seem out of range at all... (Unless you've got a 200MB hard FC hard drive...) Ken -- Kenneth Merry ken@kdm.org
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