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Date: Wed, 07 Aug 1996 14:18:05 -0700
From: Julian Elischer <julian@whistle.com>
Organization: Whistle Communications
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To: "R.D. Thrush" <rd@thrush.com>
CC: freebsd-current@freebsd.org
Subject: Re: SCSI Multiple LUN support - 2.2-960801-SNAP
References: <199608071953.PAA11197@tarpit.thrush.com>
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R.D. Thrush wrote:
> 
>   2.2-960801-SNAP is unable to recognize multiple LUNs on a wide scsi
> target connected to either a BusLogic 956C or an Adaptec 2940UW.  Is
> there some additional kernel configuration required to enable
> detection of multiple LUNs?
> 
>   FWIW, on the same hardware, bsd/os 2.1 locates all 5 LUNs on the one
> target when connected to either of the above 2 adapters.
we found so many devices that erroneously responded to
all LUNS that we disabled it by default.

see /sys/scsi/scsiconf.c

look for SC_ALL_LUNS (or something like that)
you may need to put a recognition entry in for your device.