Date: Thu, 15 Aug 2002 11:46:56 -0700 (PDT) From: Nate Lawson <nate@root.org> To: "Kenneth D. Merry" <ken@kdm.org> Cc: Chuck McCrobie <mccrobie@cablespeed.com>, freebsd-scsi <freebsd-scsi@FreeBSD.ORG> Subject: Re: pioneer DRM-600 problem Message-ID: <Pine.BSF.4.21.0208151134420.40312-100000@root.org> In-Reply-To: <20020814223152.A60159@panzer.kdm.org>
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On Wed, 14 Aug 2002, Kenneth D. Merry wrote:
> On Thu, Aug 15, 2002 at 00:24:50 -0400, Chuck McCrobie wrote:
> > "Kenneth D. Merry" wrote:
> > > On Wed, Aug 14, 2002 at 22:53:24 -0400, Kurt Seel wrote:
> > > > cd5: cd present [326103 x 2048 byte records]
> > > > (cd6:ahc0:0:0:6): READ CD RECORDED CAPACITY. CDB: 25 c0 0 0 0 0 0 0 0 0
> > > > (cd6:ahc0:0:0:6): ILLEGAL REQUEST asc:25,0
> > > > (cd6:ahc0:0:0:6): Logical unit not supported
> > > > (cd6:ahc0:0:0:6): fatal error, failed to attach to device
> > > > (cd6:ahc0:0:0:6): lost device
> > > > (cd6:ahc0:0:0:6): removing device entry
> > > > (cd7:ahc0:0:0:7): READ CD RECORDED CAPACITY. CDB: 25 e0 0 0 0 0 0 0 0 0
> > > > (cd7:ahc0:0:0:7): ILLEGAL REQUEST asc:25,0
> > > > (cd7:ahc0:0:0:7): Logical unit not supported
> > > > (cd7:ahc0:0:0:7): fatal error, failed to attach to device
> > > > (cd7:ahc0:0:0:7): lost device
> > > > (cd7:ahc0:0:0:7): removing device entry
> > >
> > > It looks like it's behaving bogusly there. It shouldn't respond to an
> > > inquiry on LUNs 6 and 7 if there isn't a CD slot at those LUNs.
> > >
> > > Anyway, that should be mostly harmless.
> >
> > Yes, this is a LUN based changer. To get it to swap disks, one
> > references the other LUNs. The changer should automatically swap out
> > one disk and insert the other. It looks like its doing what it should
> > during the probe.
> >
> > I don't remember exactly what the SCSI spec. says for LUNs - I think
> > reporting that the "Logical unit not supported" is valid for LUNs 6 and
> > 7 - what else would a LUN type device report if it supports 6 out of 8
> > LUNs?
>
> It shouldn't respond to an inquiry on that LUN if that LUN isn't supported.
>
> The "Logical unit not supported" error is correct, but we should never get
> that far. The first thing we do for each LUN is send an inquiry, and the
> device should just not send back a response if it doesn't support the LUN.
I thought it was legit to respond to inquiry with the following qualifier
if the device is there but doesn't support the requested LUN.
#define SID_QUAL_BAD_LU 0x03 /* The target is not capable of
* supporting a physical device on
* this logical unit. For this
* peripheral qualifier the peripheral
* device type shall be set to 1Fh to
* provide compatibility with previous
* versions of SCSI. All other
* peripheral device type values are
* reserved for this peripheral
* qualifier.
*/
-Nate
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