[8992] in linux-scsi channel archive
Re: multi-initiator?
daemon@ATHENA.MIT.EDU (Kurt Garloff)
Thu Jun 15 09:27:40 2000
Date: Thu, 15 Jun 2000 15:15:31 +0200
From: Kurt Garloff <garloff@suse.de>
To: "Ralston, Steve" <sralston@lsil.com>
Cc: linux-scsi@vger.rutgers.edu
Message-ID: <20000615151531.Y1889@garloff.tue.nl>
Mail-Followup-To: Kurt Garloff <garloff@suse.de>,
"Ralston, Steve" <sralston@lsil.com>, linux-scsi@vger.rutgers.edu
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In-Reply-To: <B2B3C90E45AED111B7B40001FA7E520A0383424F@exw-kansas.ks.lsil.com>; from sralston@lsil.com on Wed, Jun 14, 2000 at 08:49:22PM -0500
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On Wed, Jun 14, 2000 at 08:49:22PM -0500, Ralston, Steve wrote:
> There's been some recent discussion and questions 'round here
> about multi-initiator setups on linux. From what I can determine,
> the linux scsi mid-layer doesn't do any sort of RESERVE / RELEASE
> stuff. (RESERVE_10, RELEASE_10 weren't even defined in
> <scsi/scsi.h> until very recently).
No. And it would be cleared by the exception handling as sooner or later you
would get a SCSI reset because of the reservation conflicts ...
> So with two or three linux systems attached to the same fibre channel
> (loop in this case:-), I can mount the same target (ext2 f.s.) from
> any+all the systems and (blindly+) merrily work away...
> while eventual multiple writes clobber the file system, right?
A single write can be enough, as all the other hosts now see an
insconsistent filesystem, containing old data from the buffer/page cache and
new one read from the disk.
> Or is this handled via some other mechanism?
> + Driver(s) responsible for handling any+all multi-initiator issues.
> + LVM, clustering, or somesuch?
No.
Of course, you can design software to handle this ...
Regards,
--=20
Kurt Garloff <garloff@suse.de> Eindhoven, NL
GPG key: See mail header, key servers Linux kernel development
SuSE GmbH, Nuernberg, FRG SCSI, Security
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