It's almost certainly the SIL3114 controller.
Google "SIL3114 data corruption" -- it's nasty.

Jeff

On Thu, Sep 25, 2008 at 07:50:01AM +0200, Mikael Karlsson wrote:
> I have a strange problem involving changes in large file on a mirrored 
> zpool in
> Open solaris snv96.
> We use it at storage in a VMware ESXi lab environment. All virtual disk 
> files gets
> corrupted when changes are made within the files (when running the 
> machine that is).
> 
> The "sad" thing is that I've created about ~200Gb of random data in 
> large files and
> even modified those files without any problem (using dd with skip and 
> conv=notrunc options).
> I've copied the files within the pool and over the network on all 
> network interfaces
> on the machine - without problems.
> 
> It's just those .vmdk files that gets corrupted.
> 
> The hardware is an Opteron desktop machine with a SIL3114 sata 
> interface. Personally I have exactly
> the same interface at home with the same setup without problem. Only the 
> other hardware differs (disks and so on).
> 
> The disks are WD7500AACS, which is those with variable rotation speed 
> 5400-7200. Could it
> be the disks? Could it be the disk controller or the rest of the 
> hardware?? I should mention that the
> controller has been flashed with a non-raid bios.
> 
> I could provide more information if needed! Is there anyone that have 
> any ideas or suggestions?
> 
> 
> Some output:
> 
> bash-3.00# zpool status -vx
>   pool: testing
>  state: ONLINE
> status: One or more devices has experienced an error resulting in data
>         corruption.  Applications may be affected.
> action: Restore the file in question if possible.  Otherwise restore the
>         entire pool from backup.
>    see: http://www.sun.com/msg/ZFS-8000-8A
>  scrub: scrub completed with 1 errors on Wed Sep 24 16:59:13 2008
> config:
> 
>         NAME        STATE     READ WRITE CKSUM
>         testing     ONLINE       0     0    16
>           mirror    ONLINE       0     0    16
>             c0d1    ONLINE       0     0    51
>             c1d1    ONLINE       0     0    54
> 
> errors: Permanent errors have been detected in the following files:
> 
>         /testing/ZFS-problem/ZFS-problem-flat.vmdk
> 
> 
> Regards
> 
> Mikael
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