On Wed, Dec 18, 2013 at 11:29 AM, Leonidas Spyropoulos <artafi...@gmail.com> wrote: > On Wed, Dec 18, 2013 at 11:05:29AM +0000, Hugo Mills wrote: >> On Wed, Dec 18, 2013 at 10:44:43AM +0000, Leonidas Spyropoulos wrote: >> > I'm using the same subject as it might be relevant, feel free to change >> > it.# >> > >> > I'm trying to do some maintenance to the system running over a btrfs file >> > system on root (/). I started a balance on the '/' partition and it failed >> > with the below information: >> > $ sudo btrfs balance start / >> > [sudo] password for inglor: >> > ERROR: error during balancing '/' - No space left on device >> > There may be more info in syslog - try dmesg | tail >> > $ dmesg | tail >> > [93827.115887] btrfs: found 29461 extents >> > [93827.481849] btrfs: relocating block group 29855055872 flags 1 >> > [93841.646011] btrfs: found 33171 extents >> > [93851.421207] btrfs: found 33171 extents >> > [93851.782054] btrfs: relocating block group 28781314048 flags 1 >> > [93866.815342] btrfs: found 52535 extents >> > [93877.159354] btrfs: found 52534 extents >> > [93877.356805] btrfs: relocating block group 28747759616 flags 34 >> > [93880.287185] btrfs: found 1 extents >> > [93880.608798] btrfs: 1 enospc errors during balance >> >> You don't specify your kernel version, but if it's older than 3.11 >> or so, you should probably upgrade -- 3.10 and earlier had occasional >> bugs where the block reserve system never kept enough blocks free to >> add a new metadata chunk when it was needed, which led to exactly this >> kind of symptom. > > You are right, apologies. It is an up to date Archlinux box with a kernel: > $ uname -a > Linux tiamat 3.12.5-1-ARCH #1 SMP PREEMPT Thu Dec 12 12:57:31 CET 2013 x86_64 > GNU/Linux > >> >> Alternatively, and this is a bit of a long shot given that the >> error seems to have been while relocating your system chunk (which >> argues against this particular diagnosis), but: >> >> Do you have a large file on that filesystem (larger than 1 GiB)? > > Unlikely since the btrfs file system in question is '/' exluding /opt and > /media directories (these are other partitions) > $ sudo find / -type f -size +1048576k -and -not -path "/media*" -print > /proc/kcore > find: `/proc/27221/task/27221/fd/5': No such file or directory > find: `/proc/27221/task/27221/fdinfo/5': No such file or directory > find: `/proc/27221/fd/5': No such file or directory > find: `/proc/27221/fdinfo/5': No such file or directory > find: `/run/user/1000/gvfs': Permission denied > inglor@tiamat ~$ > >> >> If so, I would recommend switching to a 3.12 kernel, and running a >> defrag on the file. There's a known and now-fixed bug where you can >> get ENOSPC while balancing, if a file has an extent larger than 1 GiB >> in size. (The bug being that there's an extent over 1 GiB in size in >> the first place). > > I might try the defrag option anyway and restart the balance operation, see > if this will help anyway.
Some progress on this. I managed to do a balance on data only. The problem seems to be happening when doing a metadata balance $ sudo btrfs balance start -m / [sudo] password for inglor: ERROR: error during balancing '/' - No space left on device There may be more info in syslog - try dmesg | tail $ dmesg | tail [171492.384314] systemd-journald[183]: Deleted empty journal /var/log/journal/64cfb6f6c9d1625e7fa463c200000475/user-120@8b61bc353813451babcaa25dfc82c64e-0000000000000000-0000000000000000.journal (2924544 bytes). [171492.384375] systemd-journald[183]: Vacuuming done, freed 2924544 bytes [172242.011051] btrfs: relocating block group 109781712896 flags 36 [172242.075298] btrfs: relocating block group 109748158464 flags 34 [172242.286016] btrfs: found 1 extents [172242.419286] btrfs: 1 enospc errors during balance Is there a way to recreate the metadata? (I'm guessing the answer is balance..) > > Thanks, > Leonidas > >> >> Hugo. >> >> -- >> === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === >> PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk >> --- I'd make a joke about UDP, but I don't know if --- >> anyone's actually listening... -- Caution: breathing may be hazardous to your health. #include <stdio.h> int main(){printf("%s","\x4c\x65\x6f\x6e\x69\x64\x61\x73");} -- 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
