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Q&A How to add a new drive to a BTRFS filesystem?

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 actua...

posted 2mo ago by Iizuki‭

Answer
#1: Initial revision by user avatar Iizuki‭ · 2024-03-12T14:16:01Z (2 months ago)
Add a new drive with the [device](https://btrfs.readthedocs.io/en/latest/btrfs-device.html#subcommand) command:

```bash
# 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:

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

You might want to look into the [filter](https://btrfs.readthedocs.io/en/latest/btrfs-balance.html#filters) 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.