On Mon, 1 Apr 2013 04:36:05 +0600 Roman Mamedov <rm@xxxxxxxxxx> wrote: > Hello, > > After a reboot the filesystem now does not mount at all, with similar messages. So thinking this was an isolated incident, I foolishly continued setting up scheduled balance on other systems with btrfs that I have. And got into exactly the same situation on another machine!! Trying to balance this with -dusage=5, on kernel 3.8.5: Data: total=215.01GB, used=141.76GB System, DUP: total=32.00MB, used=32.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=9.38GB, used=1.09GB Same messages, "Object already exists". While I currently left the previously mentioned 2TB FS in an unmounted broken state, still waiting for any response from you on how to properly recover from this problem, in this new case I needed to restore the machine as soon as possible. I tried btrfsck --repair, it corrected a lot of errors, but in the end gave up with a message saying that it can't repair the filesystem; then I did btrfs-zero-log. After this the FS started mounting successfully again. Not sure if I got any data corruption as a result, but this is the root FS and /home, and the machine successfully booted up with no data lost in any of the apps that were active just before the crash (e.g browser, IM and IRC clients), so probably not. -- With respect, Roman
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