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How to specify the subvolume path in Btrfs?
There are two ways how to specify the subvolume, by or by the path. The id can be obtained from btrfs subvolume list, btrfs subvolume show or btrfs inspect-internal rootid. Show more information about subvolume regarding UUIDs, times, generations, flags and related snapshots.
What is a subvolume in a filesystem?
A subvolume is a part of filesystem with its own independent file/directory hierarchy. Subvolumes can share file extents. A snapshot is also subvolume, but with a given initial content of the original subvolume.
How to find the ID of a subvolume?
For every subvolume the following information is shown by default: where ID is subvolume’s id, gen is an internal counter which is updated every transaction, top level is the same as parent subvolume’s id, and path is the relative path of the subvolume to the top level subvolume.
When to use the root subvolume in Linux?
From a user perspective, the only place that it mattrs that the root subvolume is a subvolume is when mounting with -o subvolid=5 to bypass a default subvolume setting. Thanks for contributing an answer to Unix & Linux Stack Exchange!
Can a volume UUID be changed in Btrfs?
There is no way to do that for the moment. Actually, the volume UUID is used in each node of the chunk tree. You’ll have to change them in there also assuming that the headers of the chunks/device are not hashed. BTRFS was really not design to allow this kind of backup.
Which is easier to backup Luks or btrfs?
BTRFS is moving fast, I guess more backuping features will come out in the future. BTW, encryption is easier to apply on files using either LUKS for partition-based encryption or EnFS or EncryptFS for file-based encryption.
How to change the UUID of an offline file?
With the program btrfstune, which is part of more recent versions of the normal btrfs-tools, the UUID of a offline file system can be changed. If the partition is eg. /dev/sda1, use following command to generate a new, random UUID: