From owner-freebsd-scsi  Wed Mar 17 22:55:33 1999
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Date: Thu, 18 Mar 1999 17:54:27 +1100
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199903180654.RAA13465@godzilla.zeta.org.au>
To: ken@plutotech.com, winter@jurai.net
Subject: Re: SONY SMO-C501-09 not recognized under CAM
Cc: freebsd-scsi@FreeBSD.ORG, joerg_wunsch@uriah.heep.sax.de
Sender: owner-freebsd-scsi@FreeBSD.ORG
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X-Loop: FreeBSD.org

>eisa-test# disklabel da5
>disklabel: ioctl DIOCGDINFO: Invalid argument
><on console>
>da5: cannot find label (no disk label)
>da5s4: cannot find label (no disk label)
>dscheck: b_bcount 512 is not on a sector boundary (ssize 1024)
>da5: cannot find label (no disk label)
>da5s4: cannot find label (no disk label)
>
>No, this isn't because I've got 1024 byte sector media loaded though that
>fact that it cares about blocksize is strange.

This is because disklabel (un)helpfully converts da5 to /dev/da5c (the
'c' partition on the first FreeBSD slice, aka da5s4c), and the slice
containing this partition doesn't have a label, and the driver thinks
that the media blocksize is 1024.  Requesting an i/o size of less than
the media blocksize is a bug somewhere (probably in disklabel(8)).
Printing this message in dscheck() is a another bug.  There is no
portably way to determine the blocksize; applications may need to try
various multiples of DEV_BSIZE.

>'disklabel /dev/da5' shows stuff.

This is because /dev/da5 is the whole disk, which is completely different
from the 'c' partition on the first FreeBSD slice (if any).  Whole disks
always have a read-only in-core label.

>eisa-test# disklabel -R -r da5 foo
>disklabel: No space left on device

This is because sectors/unit and/or one of the partition sizes specified
in "foo" is larger than the number of physical sectors.  This may be
caused by confusion about the physical sector size.

>eisa-test# disklabel -R -r /dev/da5 foo
>disklabel: ioctl DIOCWLABEL: Operation not supported by device

This is because the read-only in-core label for the whole disk is read-only.

Bruce


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