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To: Chris Wedgwood <cw@f00f.org>
Cc: John Alvord <jalvo@mbay.net>, Daniel Phillips <phillips@bonn-fries.net>,
        Alan Cox <alan@lxorguk.ukuu.org.uk>,
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        mike@bigstorage.com, kevin@bigstorage.com, linux-lvm@sistina.com
Subject: Re: [PATCH] 64 bit scsi read/write
In-Reply-To: <Pine.LNX.4.20.0107142304010.17541-100000@otter.mbay.net>
	<20010715180752.B7993@weta.f00f.org>
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From: Juan Quintela <quintela@mandrakesoft.com>
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Date: 16 Jul 2001 20:31:57 -0400
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>>>>> "chris" == Chris Wedgwood <cw@f00f.org> writes:

chris> On Sat, Jul 14, 2001 at 11:05:36PM -0700, John Alvord wrote:
chris> In the IBM solution to this (1977-78, VM/CMS) the critical data was
chris> written at the begining and the end of the block. If the two data items
chris> didn't match then the block was rejected.

chris> Neat.


chris> Simple and effective.  Presumably you can also checksum the block, and
chris> check that.

There is the rumor (I can't confirm that), that you need checksums,
that some disks are able to write well the beginning & the end of the
sector and put garbage in the middle in the case of problems.  I
have never been able to reproduce that errors, but ....

Later, Juan.


-- 
In theory, practice and theory are the same, but in practice they 
are different -- Larry McVoy
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