Hi, I'm getting a ENOSPC error from btrfs despite there still being plenty of space left: % df -m /mnt/nas3 Filesystem 1M-blocks Used Available Use% Mounted on /dev/mapper/nas3-a 19077220 18805132 270773 99% /mnt/nas3 % btrfs fi show Label: none uuid: 4b18f84e-2499-41ca-81ff-fe1783c11491 Total devices 1 FS bytes used 17.91TiB devid 1 size 18.19TiB used 17.94TiB path /dev/mapper/nas3-a Btrfs v3.12 % btrfs fi df Data, single: total=17.89TiB, used=17.88TiB System, DUP: total=32.00MiB, used=1.92MiB Metadata, DUP: total=25.50GiB, used=24.89GiB As you can see there are still 270GiB free and plenty of block groups free on the device too. So why isn't btrfs allocating a new block group to store more data? MfG Goswin -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html