Re: mismatch_cnt, random bitflips, silent corruption(?), mdadm/sw raid[1

To:	Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Subject:	Re: mismatch_cnt, random bitflips, silent corruption(?), mdadm/sw raid[156]
From:	Matt Garman <matthew.garman@xxxxxxxxx>
Date:	Tue, 30 Dec 2008 08:20:26 -0600
Cc:	linux-kernel@xxxxxxxxxxxxxxx, linux-raid@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, smartmontools-support@xxxxxxxxxxxxxxxxxxxxx, Alan Piszcz <ap@xxxxxxxxxxxxx>
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On Thu, Dec 25, 2008 at 01:04:07PM -0500, Justin Piszcz wrote:
> Options/alternatives for maintaining data integrity?
>
> 1. Obviously DVD and/or LTO-tape (multiple copies of data at rest)
> http://epoka.dk/media/Linear_Tape_Open_(LTO)_Ultrium_Data_Cartridges.pdf
> -> For LTO-2/LTO-3
> -> Uncorrected bit error rate 1x10-17 1x10-17
> -> Undetected bit error rate 1x10-27 1x10-27
>
> 2. ZFS, but only runs in user-space in Linux.
>
> 3. Keep an md5sum for each file on the filesystem and run daily
> checks?

I've recently started using par2[1][2] on backed up files.

I just started doing this, so don't know how it will work in the
long run.  Can't hurt, anyway, other than taking up more space.

[1] http://www.par2.net/
[2] http://parchive.sourceforge.net/

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