Yikes. I would not be able to sleep tonight if it were not for the BBU cache in 
front of these disks... 

diskchecker.pl consistently reported several examples of corruption 
post-power-loss (usually 10 - 30 ) on unprotected M500s/M550s, so I think it's 
pretty much open to debate what types of madness and corruption you'll find if 
you look close enough.

G


On 07 Jul 2015, at 16:59, Heikki Linnakangas <hlinn...@iki.fi> wrote:

> 
> So it lies about fsync()... The next question is, does it nevertheless 
> enforce the correct ordering of persisting fsync'd data? If you write to file 
> A and fsync it, then write to another file B and fsync it too, is it 
> guaranteed that if B is persisted, A is as well? Because if it isn't, you can 
> end up with filesystem (or database) corruption anyway.
> 
> - Heikki



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