OS: Ubuntu 16.04.2 LTS / Disks: btrfs mirror on 2 ssd partitions - /dev/sda4 /dev/sdb4
dmesg shows error every 15 mins
May 7 15:02:22 blade3 kernel: [ 9174.648066] BTRFS error (device sdb4): could not find root 8 ... May 7 21:18:43 blade3 kernel: [31756.490619] BTRFS error (device sdb4): could not find root 8
This error disappeared after enabling quota (just like Sly_tom_cat mentioned).
OS: Ubuntu 16.04.2 LTS / Disks: btrfs mirror on 2 ssd partitions - /dev/sda4 /dev/sdb4
dmesg shows error every 15 mins
May 7 15:02:22 blade3 kernel: [ 9174.648066] BTRFS error (device sdb4): could not find root 8
...
May 7 21:18:43 blade3 kernel: [31756.490619] BTRFS error (device sdb4): could not find root 8
This error disappeared after enabling quota (just like Sly_tom_cat mentioned).