[8991] in linux-scsi channel archive
Re: multi-initiator?
daemon@ATHENA.MIT.EDU (Robin T. Miller)
Thu Jun 15 09:23:08 2000
Message-ID: <3948D7F0.AED3D60D@compaq.com>
Date: Thu, 15 Jun 2000 09:19:44 -0400
From: "Robin T. Miller" <Robin.Miller@compaq.com>
MIME-Version: 1.0
To: "Ralston, Steve" <sralston@lsil.com>
Cc: linux-scsi@vger.rutgers.edu
Content-Type: text/plain; charset=us-ascii
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Hi Steve,
You could implement simple device synchronization using the
SCSI Command Utility 'scu', if you wish. It supports Reserve/Release,
as well as Persistent Reserve In/Out, although this latter capability
is not widely supported yet.
A simple script using 'rsh' between systems, could use these
'scu' commands to restrict device access.
The URL for 'scu' is:
http://www.bit-net.com/~rmiller/scu.html
Sorry, only an executable and documentation are distributed.
The source belongs to Compaq, and I am not authorized to distribute it.
Regards,
Robin
> "Ralston, Steve" wrote:
>
> Sorry if this has been covered here in the past. Searches of
> various linux mlists for "multi|initiator|reserve|release" failed to
> turn up anything (recent) that looked particularly related, so here goes...
>
> 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).
>
> 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?
>
> Or is this handled via some other mechanism?
> + Driver(s) responsible for handling any+all multi-initiator issues.
> + LVM, clustering, or somesuch?
>
> Thanks,
> -SteveR
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