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Date: Thu, 30 Apr 2009 19:33:46 -0400
From: "Clyde E. Kunkel" <rascal.jumper-747@cox.net>
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Subject: Re: [linux-lvm] Random file system errors
References: <200904290352.XAA08424@out-of-band.media.mit.edu>
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On 04/28/2009 11:52 PM, f-lvm@media.mit.edu wrote:
> Btw, one way to proceed on the test-your-hardware angle without
> yanking disks (or even opening the case) and possibly turning this
> into a heisenbug if it really -is- something like cabling would be
> to do something like this:
>
>     dd if=/dev/hda bs=1M count=1000 | md5sum
>
> <snip>
>
> And report back; it'd be good to close the loop on this if it's proven
> -not- to be an LVM issue.
>
>    

Frequent mismatched sha1sums on /dev/sdf which has the PV for the 
problem LV.  All other /dev/sd* ran clean.

Thanks for the valuable debugging method.  Looks like a SIL 680 card, or 
cable, or Seagate drive problem, but will be easy to isolate.