Stefan Malte Schumacher posted on Sun, 27 Apr 2014 17:37:26 +0200 as excerpted:
> Chris and Duncan: I tried both your suggestions but unfortunately > without success. Here is the output: > > mars:~ # btrfs balance start -susage=0 -f -v /mnt/btrfs/ > Dumping filters: flags 0xa, state 0x0, force is on > SYSTEM (flags 0x2): balancing, usage=0 > Done, had to relocate 0 out of 2708 chunks > > mars:~ # btrfs fi df /mnt/btrfs/ > Data, RAID1: total=2.64TiB, used=2.22TiB > System, RAID1: total=8.00MiB, used=380.00KiB > System, single: total=4.00MiB, used=0.00 > Metadata, RAID1: total=4.00GiB, used=2.94GiB > -------------------------------------------- > > mars:~ # btrfs balance start -sconvert=raid1,soft -f -v /mnt/btrfs/ > Dumping filters: flags 0xa, state 0x0, force is on > SYSTEM (flags 0x300): converting, target=16, soft is on > Done, had to relocate 0 out of 2708 chunks > > mars:~ # btrfs fi df /mnt/btrfs/ > Data, RAID1: total=2.64TiB, used=2.22TiB > System, RAID1: total=8.00MiB, used=380.00KiB > System, single: total=4.00MiB, used=0.00 > Metadata, RAID1: total=4.00GiB, used=2.94GiB OK, this is interesting It may be that you're reproducing something a couple other people saw earlier, but I've never seen here, which might be because I tend to do -m<whatever (metadata) and let it handle -s/system at the same time, instead of doing -s<whatever> explicitly. So try this one: btrfs balance start -musage=0 -v (-f shouldn't be needed for this one because you're not doing -s specifically, and not forcing a lower redundancy level.) It may or may not free a couple metadata chunks too, but at least here, that's /exactly/ what I've used, and it has /never/ failed to cleanup that unused system chunk. If that fails to remove the extra system chunk, then we have a mystery indeed. What's different on your system and why isn't it working? If it succeeds in removing it, then we have a different and more limited bug/mystery. -s sometimes ignores system chunks it's documented to balance, while -m is doing both metadata and system, as expected. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
