[7068] in linux-scsi channel archive
Re: SCSI /dev/sg question
daemon@ATHENA.MIT.EDU (Kurt Garloff)
Sun Aug 29 18:09:14 1999
Date: Sun, 29 Aug 1999 23:42:16 +0200
From: Kurt Garloff <garloff@suse.de>
To: gokhan sozmen <gokhan_sozmen@hotbot.com>
Cc: linux-scsi@vger.rutgers.edu, linux-kernel@vger.rutgers.edu
Mail-Followup-To: gokhan sozmen <gokhan_sozmen@hotbot.com>,
linux-scsi@vger.rutgers.edu, linux-kernel@vger.rutgers.edu
In-Reply-To: <GJCKHMBAHECEGAAA@hotbot.com>; from gokhan sozmen on Wed, Aug 25, 1999 at 06:57:23AM -0700
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On Wed, Aug 25, 1999 at 06:57:23AM -0700, gokhan sozmen wrote:
> Hi folks,
>=20
> I was asked this question today and could not come up
> with an answer:
>=20
> Does a SCSI host adapter itself get mapped to a
> /dev/sgx device file? For example if you have an
> adapter (ID=3D7)with one SCSI disk (ID=3D0), after a
> SCSI bus scan do you get:
>=20
> /dev/sga -> disk
> /dev/sgb -> adapter ??
This is not possible. The Linux SCSI drivers that I know don't allcoate an
entry in the list of SCSI devices, not in /proc/scsi/scsi, nor in /dev/sg?.
But what do you want to achieve by sending SCSI commands via sg to the
adapter?=20
The adapters don't support target mode by the way, so you can't communicate
between two SCSI adapters. I believe, Marc SCHAEFER is working on it.
> If not, how can you talk to an adapter driver if
> there are no SCSI devices are attached to it?
Normally, you don't want to tal to the adpater, but to devices attached to =
it.
This is just handled the normal way: Use one of the high level interfaces,
Linux provides: sd, sr, st, sg.
If you want to change SCSI adapter configuration, some adapters provide
kernel/module parameters. Some are even configurable dynamically via the
/proc interface.
> All responses appreciated.
Hope this helps.
--=20
Kurt Garloff <garloff@suse.de> Wuppertal, FRG
PGP2 key: See mail header, key servers Linux kernel development
SuSE GmbH, N=FCrnberg, FRG SCSI drivers: tmscsim(DC390), DC395
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