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Date: Tue, 19 Nov 1996 09:43:33 -0800
From: Julian Elischer <julian@whistle.com>
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To: Andre Albsmeier <Andre.Albsmeier@mchp.siemens.de>
CC: freebsd-current@freebsd.org
Subject: Re: ch0 disappears when st0 is enabled
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Andre Albsmeier wrote:
> 
> Hi,
> 
> I have got a DLT 2700 STACKER tape drive with 7 tapes in it.
> When I enable ch0 in the kernel config, it will find a device
> ch0 on LUN 1. As far as I have understood, this device is only for
> changing the tapes, not for reading or writing to it.
> But as soon as I enable st0 also, the ch0 line disappears and is
> replaced by an st0 on LUN 0 (with the same SCSI address of course).
> 
> Is it possible, that other LUNs are not probed, as soon as one
> device is found (in my case the st0)?

yes exactly.. by default  the tapes are not probed beyond lun0

you need to add an entry for your device in /sys/scsi/scsiconf.c
and include the flag SCSI_MORE_LUNS (or whatever the exact spelling is)

> 
> Thanks for any advices...
> 
> Andre
> 
> P.S.: I'm running the current 2.2-ALPHA kernel...