On 03/10/2013 10:45 PM, Harald Glatt wrote:

> I've noticed through my own tests that on a single device I can
> corrupt around 5% of the data completely before btrfs fails. Up to
> that point both filesystem as well as data integrity stays at 100%.
> However the default layout for one disk seems to be having the data
> once, the metadata DUP and the system DUP too. 

How make you the corruption ? Does btrfs return wrong data ? How is
calculated the 5% ?


> Having these 5% isn't
> mentioned anywhere... Is this a value that could maybe be manipulated
> and could it be introduced into a naming scheme like this? Also where
> do the 5% redundancy come from?

On a single device, the metadata are DUPlicated but the data have only 1
copy.

This means that if you corrupt the 1 copy of the metadata, btrfs
survives using the other copy. Instead if you corrupt the data btrfs
return an error.


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