this post was submitted on 06 Jun 2024
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What does balance do in that context? As I understand unless the volume spans multiple drives or the files were so numerous and small that metadata was a significant portion of their disk usage, rebalancing will only unallocate data chunks just for them to be allocated again when that space gets used.
Unless the program you're using is wrongly checking unallocated space instead of free space, it shouldn't really affect disk usage
Edit: It might help with trim and make the drive faster though. But you're also putting a bunch of unnecessary wear on it so it might not be worth it
Don't know that much about how btrfs works, just had a problem with the same symptoms as OP a while ago.. Things started failing due to "no space left on device" despite df reporting several gigabytes available. Took a while to figure out what was going on but eventually found some stackoverflow/reddit post that told me to run the balance command and it worked. Just a single drive with btrfs, no raid.