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Re: [PATCH] libxfs: Get Physical Sector Size instead of Logical Sector s

To: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Subject: Re: [PATCH] libxfs: Get Physical Sector Size instead of Logical Sector size
From: Greg Freemyer <greg.freemyer@xxxxxxxxx>
Date: Mon, 28 Nov 2011 11:56:17 -0500
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, Eric Sandeen <sandeen@xxxxxxxxxxx>, Carlos Maiolino <cmaiolino@xxxxxxxxxx>, xfs@xxxxxxxxxxx
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On Mon, Nov 28, 2011 at 11:08 AM, Martin K. Petersen
<martin.petersen@xxxxxxxxxx> wrote:
> And while Christoph is right that (thankfully) nobody ended up shipping
> drives with 1-alignment by default, most 512e drives have the alignment
> jumper and some people actually use it.

I've seen at least one of my clients use the jumper.  It was my first
realization that jumper actually "moves" stuff on the disk.

I realize its a virtual move, but data read from sector 63 with the
jumper in place is not the same data that is read from sector 63 with
the jumper removed.

It caught me off guard.  The fix in this case was just to re-install
the jumper like the client had it originally.

Greg

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