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From: Daniel Phillips <phillips@bonn-fries.net>
To: Chris Wedgwood <cw@f00f.org>, Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] 64 bit scsi read/write
Date: Sat, 14 Jul 2001 22:11:30 +0200
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Cc: Andrew Morton <andrewm@uow.edu.au>,
        Andreas Dilger <adilger@turbolinux.com>,
        "Albert D. Cahalan" <acahalan@cs.uml.edu>,
        Ben LaHaise <bcrl@redhat.com>,
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On Saturday 14 July 2001 16:50, Chris Wedgwood wrote:
> On Sat, Jul 14, 2001 at 09:45:44AM +0100, Alan Cox wrote:
>
>     As far as I can tell none of them at least in the IDE world
>
> SCSI disk must, or at least some... if not, how to peopel like NetApp
> get these cool HA certifications?

Atomic commit.  The superblock, which references the updated version 
of the filesystem, carries a sequence number and a checksum.  It is 
written to one of two alternating locations.  On restart, both
locations are read and the highest numbered superblock with a correct
checksum is chosen as the new filesystem root.

--
Daniel
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