linux-kernel - RE: sata_mv and Highpoint RocketRAID 230x, corruption?

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Message-ID: <25B374CC0D9DFB4698BB331F82CD0CF20D5FFC@wdscexbe08.sc.wdc.com>
Date:	Fri, 22 Oct 2010 19:21:08 -0700
From:	"Daniel Taylor" <Daniel.Taylor@....com>
To:	<linux-kernel@...r.kernel.org>
Subject: RE: sata_mv and Highpoint RocketRAID 230x, corruption?

 

> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org 
> [mailto:linux-kernel-owner@...r.kernel.org] On Behalf Of Mark Lord
> Sent: Friday, October 22, 2010 7:00 PM
> To: Mathias Burén
> Cc: linux-kernel@...r.kernel.org
> Subject: Re: sata_mv and Highpoint RocketRAID 230x, corruption?
> 
> On 10-10-20 04:03 PM, Mathias Burén wrote:
> ..
> > I'm currently not using the BIOS of the raid controller for anything
> > else then staggered disk spinup. The HDD partitions start at sector
> > 2048 (to get a 1MB alignment since they're 4k sector 
> drives, WD20EARS)
> > and end at the last sector.
> > What I'm worried about is the corruption mentioned in dmesg, is this
> > explained somewhere in more detail? Google didn't reveal 
> much. Am I in
> > danger?
> 
> Yes.  Just repartition the drives to avoid the final 2GB of 
> each drive,
> and then you'll be safe.
> 
> The RocketRaid BIOS that I examined here a couple of years ago,
> liked to write "metadata" over top of whatever was in certain sectors
> near the end of the drive.  EVEN FOR NON-RAID DRIVES.
> 
> I think it was the last even (power-of-two) multiple of 1GB 
> or something,
> so if you leave the final 2GB untouched, you're guaranteed to 
> avoid it.
> 
> Thus the recommendation.

What happens to the backup GPT at the end of the disk?

> 
> Cheers
> --
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