On Wed, Jul 06, 2016 at 11:55:42AM +0200, Stanislaw Kaminski wrote: > Hi, > I am fighting with this since at least Monday - see > https://superuser.com/questions/1096658/btrfs-out-of-space-even-though-there-should-be-10-left > > Here's the data: > # uname -a > Linux archb3 4.6.3-2-ARCH #1 PREEMPT Wed Jun 29 07:15:33 MDT 2016 > armv5tel GNU/Linux > > # btrfs --version > btrfs-progs v4.6 > > # btrfs fi show > Label: 'home' uuid: 1c7e35e8-f013-4f65-9d19-eaa168ac088b > Total devices 1 FS bytes used 1.71TiB > devid 1 size 1.81TiB used 1.71TiB path /dev/sda4
In this state, you should definitely not be seeing out of space errors. This is, therefore, a bug you're seeing. I've not been following things as closely as I'd like of late, but I think there was a bug recently involving the free space cache. It might be worth unmounting the FS and mounting again with the nospace_cache option, just to see if that helps. Hugo. > # btrfs fi df /home > Data, single: total=1.71TiB, used=1.71TiB > System, DUP: total=32.00MiB, used=224.00KiB > Metadata, DUP: total=4.00GiB, used=2.07GiB > GlobalReserve, single: total=512.00MiB, used=0.00B > > # btrfs f usage -T /home > Overall: > Device size: 1.81TiB > Device allocated: 1.71TiB > Device unallocated: 97.89GiB > Device missing: 0.00B > Used: 1.71TiB > Free (estimated): 98.22GiB (min: 49.27GiB) > Data ratio: 1.00 > Metadata ratio: 2.00 > Global reserve: 512.00MiB (used: 0.00B) > > Data Metadata System > Id Path single DUP DUP Unallocated > -- --------- ------- -------- --------- ----------- > 1 /dev/sda4 1.71TiB 8.00GiB 64.00MiB 97.89GiB > -- --------- ------- -------- --------- ----------- > Total 1.71TiB 4.00GiB 32.00MiB 97.89GiB > Used 1.71TiB 2.07GiB 224.00KiB > > # btrfs fi du -s /home > Total Exclusive Set shared Filename > 1.60TiB 1.60TiB 0.00B /home > > # btrfs f resize 1:+1G /home/ > Resize '/home/' of '1:+1G' > ERROR: unable to resize '/home/': no enough free space > > This all is after closely following: > https://btrfs.wiki.kernel.org/index.php/FAQ#Help.21_I_ran_out_of_disk_space.21 > http://marc.merlins.org/perso/btrfs/post_2014-05-04_Fixing-Btrfs-Filesystem-Full-Problems.html > > So, already did full volume rebalance, defrag, rebooted multiple times > - still, "Error: out of disk space". > > To sum up: > - my files sum to 1.6 TiB > - disk usage is shown to be 1.71 TiB > - volume size is 1.81 TiB > - btrfs util shows I have ~98 GiB free space on the volume > - I am getting "out of space" message > > Bonus: > - I removed 50 GB of data from the drive and I still get "out of > space" message after writing ~1 GB. > > Help would be very appreciated. > > Cheers, > Stan -- Hugo Mills | You can play with your friends' privates, but you hugo@... carfax.org.uk | can't play with your friends' childrens' privates. http://carfax.org.uk/ | PGP: E2AB1DE4 | C++ coding rule
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