On 2006/11/27 at 03:04:55AM +0100, Moritz Kiese wrote:
> Greetings,
>
> I just hooked up a rather old 6x CD-changer (Pioneer DRM-624X) to my
> SUN Ultra 1 (fast SCSI provided by a combi SBUS card with additional esp,
> le & cereal). The CD-changer usually presents its six cds at six different
> devices appearing under six LUNs, however neither 4.0 GENERIC nor a custom
> kernel with an additional
>
> option SCSIFORCELUN_BUSES=0x0001
>
> which I vaguely remember from an elderly discussion about multi-LUN
> devices on misc@ seems to find more than the first cd (cd1) of the six
> (which seems to be working fine).
> In case it helps: Under Lunix and (IIRC) Slowlaris this beast appeared
> under six different LUNs, generating six cd-devices. All devices could be
> mounted simultaneously, but only one at a time could be read of course. So
> I wonder whether there is some way to force LUN probing on all devices?
>
> Any hints highly appreciated,
Look at sd(4) -- especially the synopsis:
======================================================================
sd* at scsibus?
#sd0 at scsibus0 target 3 lun 0 (fixed-configuration example)
======================================================================
And at cd(4)
======================================================================
cd* at scsibus?
#cd0 at scsibus0 target 6 lun 0 (fixed-configuration example)
======================================================================
Note that the first line is what you will find in your GENERIC
kernel configuration, and AFIK, it *only* selects "lun 0".
You will need, instead, to change that line to multiple lines
(assuming that you have only one SCSI drive other than the CD-ROM
changer):
======================================================================
# Your boot drive -- adjust SCSI ID as appropriate. IIRC, the
# Ultra-1 wants target 0 as the first internal drive.
#
# Yes -- I just checked, and the internal drives are SCSI ID 0
# and SCSI-ID 1, so let's allow for both, even if both are not
# currently present.
#
sd0 at scsibus0 target 0 lun 0
sd1 at scsibus0 target 1 lun 0
#
# Assume the CD-changer to be at the usual SCSI-ID 6 for
# Suns -- change as necessary
#
cd2 at scsibus0 target 6 lun 0
cd3 at scsibus0 target 6 lun 1
cd4 at scsibus0 target 6 lun 2
cd5 at scsibus0 target 6 lun 3
cd6 at scsibus0 target 6 lun 4
cd7 at scsibus0 target 6 lun 5
======================================================================
To be honest, I don't know what happens if some disks are hard
coded as above, and others are not -- but I do know that the hard-coding
of *disks* is needed for reliable behavior with the RAID system if you
boot with a missing or failed disk.
So -- make the changes to a copy of
/usr/src/sys/arch/sparc64/conf/GENERIC
(Perhaps call it WITHCDS or something similar), compile it, and install
it as the current kernel (/bsd) -- saving a copy of the old one, of
course, as something like /bsd-GENERIC to make it easier to recover if
something went wrong with the kernel which you built.
I hope that this helps,
DoN.
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