On Mon, Jan 13, 2014 at 05:40:33PM -0700, Chris Murphy wrote:
> I see no obvious hardware source for the problem, SATA Phy Event Counters are zeros except a few COMRESET events which is pretty minor. No ICRC or UDMA-CRC errors recorded. No reallocated or pending bad sectors.
> 
> I'd look at your historical system logs, messages or journalctl, and do case insensitive search for: err, unc, reset and see if anything along those lines has been reported that might explain it.
> 
> If you decide to backup, reformat, restore, then first I suggest 
> 
> btrfs-image -c 9-t 4 /dev/sdX /mnt/<pathtoanothervolume+filename>

btrfs-image -c 9 -t 4 /dev/sdX /mnt/<pathtoanothervolume+filename>

   Space between the 9 and the -t.

   Hugo.

> You can keep it handy in case a dev asks for it or you can attach it to a kernel.org bug report.
> 
> Chris Murphy--
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    --- I think that everything darkling says is actually a joke. ---    
         It's just that we haven't worked out most of them yet.