From https://btrfs.wiki.kernel.org/index.php/Compression https://btrfs.wiki.kernel.org/index.php/Compression > Btrfs supports transparent file compression. The

From https://btrfs.wiki.kernel.org/index.php/Compression https://btrfs.wiki.kernel.org/index.php/Compression > Btrfs supports transparent file compression. There are three algorithms available: ZLIB, LZO and ZSTD(since v4.14) I've been using zstd compression for qcow2 images since last year, but I admit it's kind of hidden. The man page for qemu-img [1] doesn't say a word about zstd, but it's there alright [2]. [1]: https://www.qemu.org/docs/master/tools/qemu-img.html https://www.qemu.org/docs/master/tools/qemu-img.html [2]: https://gitlab.com/qemu-project/qemu/-/blob/v7.0.0/block/qcow2-threads.c#L188 https://gitlab.com/qemu-project/qemu/-/blob/v7.0.0/block/qco...