I am running latest Debian stable. However, I used backports to update the kernel to 3.16.
root@s4 /opt/drives/ssd # uname -a Linux s4.podnix.com 3.16.0-0.bpo.4-amd64 #1 SMP Debian 3.16.7-ckt2-1~bpo70+1 (2014-12-08) x86_64 GNU/Linux root@s4 /opt/drives/ssd # btrfs --version Btrfs v3.14.1 It still reports over-use, so I am running a defrag on the file: root@s4 /opt/drives/ssd # btrfs filesystem defragment /opt/drives/ssd/disk_208.img But I see it slowly eats even more disk space durring the defrag. I had about 7GB before. When it went down close to 1GB, I cancelled it as I'm afraid it will corrupt the file if it runs out of space. Do you know how btrfs behaves if it runs out of space durring a defrag? Any other ideas how I can solve it? Regards, Daniele 2014-12-18 23:35 GMT+08:00 Hugo Mills <h...@carfax.org.uk>: > On Thu, Dec 18, 2014 at 11:02:34PM +0800, Daniele Testa wrote: >> Sorry, did not read the guidelines correctly. Here comes more info: >> >> root@s4 /opt/drives/ssd # uname -a >> Linux s4.podnix.com 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1+deb7u1 x86_64 >> GNU/Linux > > This is your problem. I think the difficulty is that writes into > the middle of an extent didn't split the extent and allow the > overwritten area to be reclaimed, so the whole extent still takes up > space. > > IIRC, josef fixed this about 18 months ago. You should upgrade your > kernel to something that isn't written in cueniform (like 3.18, say), > and defrag the file in question. I think that should fix the problem. > >> root@s4 /opt/drives/ssd # btrfs --version >> Btrfs Btrfs v0.19 > > This is also an antique, and probably needs an upgrade too > (although it's less critical than the kernel). > > Hugo. > >> root@s4 /opt/drives/ssd # btrfs fi show >> Label: none uuid: 752ed11b-defc-4717-b4c9-a9e08ad64ba6 >> Total devices 1 FS bytes used 404.74GB >> devid 1 size 410.50GB used 410.50GB path /dev/md3 >> >> Regards, >> Daniele > > -- > Hugo Mills | Python is executable pseudocode; perl is executable > hugo@... carfax.org.uk | line-noise. > http://carfax.org.uk/ | > PGP: 65E74AC0 | Ben Burton -- 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
