[9274] in linux-scsi channel archive
Re: Problem w/ recent scsi_scan changes
daemon@ATHENA.MIT.EDU (Robin T. Miller)
Mon Jul 31 09:37:47 2000
Message-ID: <3985816E.CF488E31@compaq.com>
Date: Mon, 31 Jul 2000 09:38:54 -0400
From: "Robin T. Miller" <Robin.Miller@compaq.com>
MIME-Version: 1.0
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Steve Ralston <sralston@ra.ks.lsil.com>,
linux-scsi <linux-scsi@vger.rutgers.edu>
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Hi Alan,
hmmm... my memory is a little fague on this, but I thought someone
had suggested looking at the Inquiry peripheral qualifier field?
"Peripheral Device Connected", /* 0x0 */
"Peripheral Device NOT Connected", /* 0x1 */
"Reserved", /* 0x2 */
"No Physical Device Support" /* 0x3 */
yea, I know not all devices report this correctly, but it should help.
[ sorry, I don't have 2.4 source so I don't know it it's there already ]
Regards,
Robin
Alan Cox wrote:
>
> > We're having a problem with recent (linux-2.4.0-test2) scsi_scan.c,
> > centered around this change:
> > /*
> > * We used to do a TEST_UNIT_READY before the INQUIRY but that was
> > * not really necessary. Spec recommends using INQUIRY to scan for
> > * devices (and TEST_UNIT_READY to poll for media change). - Paul G.
>
> This change is correct.
>
> > We have a RAID subsystem that happens to return (e.g.):
> > SCSI Error Report =-=-= (ioc0,scsi0:4)
> > SCSI_Status=02h (CHECK CONDITION)
> > Original_CDB[]: 00 80 00 00 00 00 - "TEST UNIT READY"
> > SenseData[A0h]: 70 00 05 00 00 00 00 98 00 00 00 00 25 00 00 00 00 00 ...
> > SenseKey=5h (ILLEGAL REQUEST); FRU=00h
> > ASC/ASCQ=25h/00h "LOGICAL UNIT NOT SUPPORTED"
> > to TEST_UNIT_READY (and READ_CAPACITY, et al), which *used* to cause linux
> > to ignore the LUN.
> >
> > We kindly request that TEST_UNIT_READY *before* INQUIRY be reinstated.
>
> That breaks some standards compliant subsystems. Probably what needs to be done
> is to accept logical-unit-not-supported from a TUR as meaning we guessed wrongly
>
> Alan
>
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