this post was submitted on 06 May 2024
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Ah okay, cool. It's that easy? Does it compress all existing data after that or is it only for new data?
What would I have to do to compress existing data?
It is only for new data.
For example, you would have to defragment your filesystem again with
btrfs filesystem defragment -r -v -czstd /
. Wherezstd
is an algorithm and/
, a root path. With this command, the default compression level will be used, which is level 3.Be careful, defragmenting the btrfs file system will/can duplicate the data.
As for a mount point, if you decided to use zstd algorithm with level 1 compression, just add the
compress=zstd:1
orcompress-force=zstd:1
to the mount options (fstab or while mounting manually)Reading the manpage (btrfs-filesystem), duplication can happen on some odd kernel versions, so no danger.
Edit: that was my interpretation of breaking up reflinks of cow data anyway. Seems there's more.
If I know correctly, defrag will always duplicate the reflink files.
https://btrfs.readthedocs.io/en/latest/Defragmentation.html
Well, compression doubled my available space. ;-)