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Date: Tue, 16 Jul 2002 07:28:44 -0700 (PDT)
From: Jauder Ho <jauderho@carumba.com>
To: Joerg Schilling <schilling@fokus.gmd.de>
Cc: vojtech@suse.cz, <James.Bottomley@steeleye.com>,
       <linux-kernel@vger.kernel.org>
Subject: Re: IDE/ATAPI in 2.5
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And path_to_inst does not always do the RightThing(tm). [1] [2] Two
systems identically configured has the potential of having path_to_inst
look different. Especially if you have previously installed a device or
moved stuff around. And if the expectation is that a group of devices will
come up in a certain sequence (think shared tape devices for instance) and
it changes, it quickly becomes a nightmare. Not a fun proposition by any
means.

--Jauder

[1] eg http://www.myri.com/scs/documentation/mug/installation/solaris.html
[2] http://www.magma.com/support/sun.htm

On Tue, 16 Jul 2002, Joerg Schilling wrote:

> >From vojtech@ucw.cz Tue Jul 16 13:59:27 2002
>
> >> It would help, if somebody would correct the current SCSI addressng scheme used
> >> in Linux. Linux currently uses something called BUS/channel/target/lun.
> >> This does not reflect reality.
> >>
> >> What Linux calls a SCSI bus is definitely not a SCSI bus but a SCSI HBA card.
> >> What Linux calls a channel really is one of possibly more SCSI busses going
> >> off one of the SCSI HBA cards. It makes sense to just count SCSI busses.
>
> >Well, no. It doesn't. Because the numbers will change if you add a card
> >(even at runtime - hotplugging USB SCSI is something real happening
> >today. And that'd be a very bad thing.
>
> It hey change, then this is a Linux kernel problem. On Solaris they don't
> change because Solaris manages /etc/path_to_inst
>
> J?rg
>
>  EMail:joerg@schily.isdn.cs.tu-berlin.de (home) J?rg Schilling D-13353 Berlin
>        js@cs.tu-berlin.de		(uni)  If you don't have iso-8859-1
>        schilling@fokus.gmd.de		(work) chars I am J"org Schilling
>  URL:  http://www.fokus.gmd.de/usr/schilling   ftp://ftp.fokus.gmd.de/pub/unix
> -
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