Btrfs: Difference between revisions

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=== Compression ===

<code>nixos-generate~~-config --show-hardware~~-config</code> doesn't detect mount options automatically~~, so to~~ enable compression, you must specify it and other mount options in ~~a persistent~~ configuration:

<code>nixos-generate-config</code> doesn't detect mount options automatically. To enable compression, you must specify them manually and other mount options in your <code>configuration.nix</code>:

<~~syntaxhighlight lang="nix"~~>

{{file|/etc/nixos/configuration.nix|nix|

fileSystems = {

"/".options = [ "compress=zstd" ];

Line 57:

Line 58:

"/swap".options = [ "noatime" ];

};

</~~syntaxhighlight~~>

</nowiki>

}}

Btrfs supports a few compression algorithms, each with different trade-offs:

* <code>zstd</code>: Good compression ratio and performance, especially for general-purpose workloads. You can specify compression levels, as example <code>compress=zstd:3</code>.

* <code>lzo</code>: Faster but provides lower compression ratios. Good for low powered systems or where performance is important.

* <code>zlib</code>: Higher compression ratio but slower performance. Less commonly used nowadays in favor of zstd.

You can find more details on the official [https://btrfs.readthedocs.io/en/latest/Compression.html Btrfs Compression Documentation].

{{note| Compression is applied only to newly written data. Existing data won't be compressed unless rewritten. (e.g., <code>btrfs filesystem defrag -r -v -czstd /path</code>)}}

=== Swap file ===

@@ Line 48: / Line 48: @@
 === Compression ===
-<code>nixos-generate-config --show-hardware-config</code> doesn't detect mount options automatically, so to enable compression, you must specify it and other mount options in a persistent configuration:
+<code>nixos-generate-config</code> doesn't detect mount options automatically. To enable compression, you must specify them manually and other mount options in your <code>configuration.nix</code>:
-<syntaxhighlight lang="nix">
+{{file|/etc/nixos/configuration.nix|nix|
+<nowiki>
 fileSystems = {
    "/".options = [ "compress=zstd" ];
@@ Line 57: / Line 58: @@
    "/swap".options = [ "noatime" ];
 };
-</syntaxhighlight>
+</nowiki>
+}}
+Btrfs supports a few compression algorithms, each with different trade-offs:
+* <code>zstd</code>: Good compression ratio and performance, especially for general-purpose workloads. You can specify compression levels, as example <code>compress=zstd:3</code>.
+* <code>lzo</code>: Faster but provides lower compression ratios. Good for low powered systems or where performance is important.
+* <code>zlib</code>: Higher compression ratio but slower performance. Less commonly used nowadays in favor of zstd.
+You can find more details on the official [https://btrfs.readthedocs.io/en/latest/Compression.html Btrfs Compression Documentation].
+{{note| Compression is applied only to newly written data. Existing data won't be compressed unless rewritten. (e.g., <code>btrfs filesystem defrag -r -v -czstd /path</code>)}}
 === Swap file ===