Am Sonntag, 1. Juli 2012 schrieb Waxhead:
> As far as I understand btrfs stores all data in huge chunks that are 
> striped, mirrored or "raid5/6'ed" throughout all the disks added to
> the  filesystem/volume.

Not through all disks. At least not with the current RAID-1 
implementation. It stores two copies of a chunk, no matter how many drives 
you use.

Rest see Hugo´s answer.

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Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
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