Difference between revisions of "Btrfs"

Here the full scope of btrfs' difference becomes visible. When btrfs takes snapshots, many files are contained unchanged in several snapshots, but only take up space in the file system once. At the same time, there can be the same(!) file with different content and size in different snapshots.

Here the full scope of btrfs' difference becomes visible. When btrfs takes snapshots, many files are contained unchanged in several snapshots, but only take up space in the file system once. At the same time, there can be the same(!) file with different content and size in different snapshots.

It is therefore not enough to simply add up the size of all files in a path to determine the '''space consumption''' in the file system.

It is therefore not enough to simply add up the size of all files in a path to determine the '''space consumption''' in the file system.

For each file, it must be determined how large it is and whether all or part of it is shared with other subvolumes. Since btrfs has to read a lot of metadata for this, it can take a '''long time''' to display the results:

For each file, it must be determined how large it is and whether all or part of it is shared with other subvolumes. Since btrfs has to read a lot of metadata for this, it can take a '''long time''' to display the results:

{{RootCmd|command=btrfs filesystem du -s /home}}

{{RootCmd|command=btrfs filesystem du -s /home}}

     Total  Exclusive  Set shared  Filename

     Total  Exclusive  Set shared  Filename

{{BoxInfo|Exclusive + Set shared|This is the actual space used in the file system}}

{{BoxInfo|Exclusive + Set shared|This is the actual space used in the file system}}

=== btrfs filesystem usage ===

=== btrfs filesystem usage ===

=== btrfs scrub status ===

=== btrfs scrub status ===