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How to add a new drive to a BTRFS filesystem?

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BTRFS is capable of spanning over multiple drives. How to add one more to an existing filesystem?

btrfs

posted 8 months ago

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Iizuki‭

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Add a new drive with the device command:

# btrfs device add /dev/new-device /path/to/the/filesystem/youre/adding/to

Then you probably want to balance the filesystem so that some data will actually live on the newly added drive:

# btrfs balance start /path/to/the/filesystem/youre/adding/to

You might want to look into the filter options, if you want to change your data/metadata profile now that you have more drives. E.g. maybe you had previously only one drive and now with two you'd like to utilize raid1 for data persistency. Plain balance won't do it.