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How do you do it on another FS?
mdadm --add /dev/md1 DEVICE mdadm --grow /dev/md1 --size=max
My friend did that, lost all his data, now uses ZFS
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Earlier quoted context omitted.
> You could just as easily run fdupes or something similar. If you only deduplicate whole files and soft links or hard links are suitable for your situation.
That’s not the aspect of the deduplication process that I was referring to. Btrfs only supports offline deduplication, where you periodically run a process that searches for duplicate blocks and combines them. Meanwhile ZFS supports online deduplication, where every block written is checked against an index to see if it is a duplicate of some existing block. That index is what takes up the memory that jcalvinowens co…