Doing a data balance profile conversion raid0->single fails with enospc, even given lots of space. So tried out enospc_debug: Mar 28 08:48:44 btrfs: relocating block group 579997815275520 flags 9 Mar 28 08:58:06 space_info 1 has 1574929309696 free, is not full Mar 28 08:58:06 space_info total=70404177657856, used=68829248086016, pinned=0, reserved=0, may_use=3175444480, readonly=262144 Mar 28 08:58:06 block group 579901178511360 has 3221225472 bytes, 3221225472 used 0 pinned 0 reserved Mar 28 08:58:06 block group has cluster?: no Mar 28 08:58:06 0 blocks of free space at or bigger than bytes is Mar 28 08:58:06 block group 579904399736832 has 3221225472 bytes, 3221225472 used 0 pinned 0 reserved Mar 28 08:58:06 block group has cluster?: no ... about 3 million lines later with different block group numbers it ends at Mar 28 09:16:48 block group 607319175987200 has 1073741824 bytes, 0 used 0 pinned 0 reserved Mar 28 09:16:48 block group has cluster?: no Mar 28 09:16:48 0 blocks of free space at or bigger than bytes is Mar 28 09:16:48 block group 607320249729024 has 1073741824 bytes, 0 used 0 pinned 0 reserved Mar 28 09:16:48 block group has cluster?: no Mar 28 09:16:48 0 blocks of free space at or bigger than bytes is Mar 28 09:16:48 btrfs: 17 enospc errors during balance space info: Total devices 3 FS bytes used 62.69TiB devid 1 size 30.01TiB used 18.16TiB path /dev/sdb devid 2 size 30.01TiB used 18.17TiB path /dev/sdc devid 3 size 40.02TiB used 28.01TiB path /dev/sdd Data, RAID0: total=9.72TiB, used=9.72TiB Data, single: total=54.36TiB, used=52.88TiB System, RAID1: total=40.00MiB, used=6.80MiB Metadata, RAID1: total=134.00GiB, used=89.69GiB -- 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