Hi, On Mon, Feb 29, 2016 at 09:56:58AM +0800, Qu Wenruo wrote: > Marc Haber wrote on 2016/02/27 22:14 +0100: > >I have again the issue of no space left on device while rebalancing > >(with btrfs-tools 4.4.1 on kernel 4.4.2 on Debian unstable): > > > >mh@fan:~$ sudo btrfs balance start /mnt/fanbtr > >ERROR: error during balancing '/mnt/fanbtr': No space left on device > > It seems that, only when balancing all chunks, ENOSPC error happens. > > And did you run any other heavy IO at background?
Not when running those last commands for the mailing list post. > BTW, is there any kernel log when the ENOSPC happens? > Would you please try the following commands to see which one caused the > problem? > And would you please provide the dmesg of them? > > # btrfs balance start -dprofiles=single /mnt/fanbtr > # btrfs balance start -mprofile=dup /mnt/fanbtr > # btrfs balance start -sprofile=dup /mnt/fanbtr I have attached the logs. I used logger(1) to have in syslog which command I executed, and I have piped the userspace's output to logger so that the syslog entries match the userspace output. -mprofile gave an error message, I therefore tried -mprofiles, and -sprofiles wanted me to use the --force, so I did that as well. The three balance commands above all three finshed alright without running into ENOSPC, while running a plain balance (which is also part of the log) errors out every time. And, the -dprofiles=single log caused a number of INFOs regarding btrfs-cleaner and btrfa-balance processes gotten stuck for more than 120 seconds during the run. I now have a kworker and a btfs-transact kernel process taking most of one CPU core each, even after the userspace programs have terminated. Is there a way to find out what these threads are actually doing? Greetings Marc -- ----------------------------------------------------------------------------- Marc Haber | "I don't trust Computers. They | Mailadresse im Header Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402 Nordisch by Nature | How to make an American Quilt | Fax: *49 6224 1600421 -- 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
