In case of brtfs with multiple devices it's possible to remove a failed/missing one. 1. unmount the FS 2. make sure the dead/missing/failing device is disconne

In case of brtfs with multiple devices it's possible to remove a failed/missing one. 1. unmount the FS 2. make sure the dead/missing/failing device is disconnected 3. mount using -o degraded option. 4. run btrfs device remove missing <mount point> It depends on having at least as many good drives as required for mounting the FS (which is 2 for raid1). https://www.reddit.com/r/btrfs/comments/7os094/removing_a_device/dsbte3d/ https://www.reddit.com/r/btrfs/comments/7os094/removing_a_de...