On 2020/2/2 上午5:17, Matt Zagrabelny wrote: > Greetings, > > I have recently installed Debian with a root disk formatted with btrfs > (RAID 10 with 4 drives of 12TB each.) > > root@zeus:~# uname -a > Linux zeus 5.4.0-3-amd64 #1 SMP Debian 5.4.13-1 (2020-01-19) x86_64 GNU/Linux This is a known bug for v5.4 and v5.5. Until recently we have settled down on how to fix it properly. The fix is here: https://patchwork.kernel.org/patch/11359995/ And it would soon be ported to involved stable trees. Thanks, Qu > root@zeus:~# btrfs --version > btrfs-progs v5.4.1 > root@zeus:~# btrfs fi show > Label: 'root' uuid: bfd97357-7f10-4648-88a4-6521c6c4bb9c > Total devices 4 FS bytes used 775.79GiB > devid 1 size 10.00TiB used 388.53GiB path /dev/sda2 > devid 2 size 10.00TiB used 388.53GiB path /dev/sdb2 > devid 3 size 10.00TiB used 388.53GiB path /dev/sdc2 > devid 4 size 10.00TiB used 388.53GiB path /dev/sdd2 > > root@zeus:~# btrfs fi df / > Data, RAID10: total=776.00GiB, used=774.84GiB > System, RAID10: total=64.00MiB, used=112.00KiB > Metadata, RAID10: total=1.00GiB, used=966.09MiB > GlobalReserve, single: total=512.00MiB, used=0.00B > root@zeus:~# dmesg > /tmp/dmesg.log > > I've run out of space: > > root@zeus:~# df -h > Filesystem Size Used Avail Use% Mounted on > udev 16G 0 16G 0% /dev > tmpfs 3.2G 9.2M 3.2G 1% /run > /dev/sda2 20T 777G 0 100% / > tmpfs 16G 0 16G 0% /dev/shm > tmpfs 5.0M 4.0K 5.0M 1% /run/lock > tmpfs 16G 0 16G 0% /sys/fs/cgroup > tmpfs 3.2G 16K 3.2G 1% /run/user/1000 > root@zeus:~# > > and I've tried balancing (both data and metadata) to get both the > system and btrfs to agree on how much free space I have. > > I've also tried resizing the disks smaller and then larger - I found a > (perhaps misleading) post on an online forum suggesting such things to > retrieve space. > > I have no idea how to proceed to fix things. > > If you'd like to see the dmesg output, please let me know - it didn't > look very informative. > > Any help, pointers, or suggestions is very welcome. > > Thanks you for your time! > > -m >
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