There is a division by 2 missing in the code. With that added, the RAID10 numbers make more sense. See also: http://permalink.gmane.org/gmane.comp.file-systems.btrfs/53989
More detail in here: https://www.spinics.net/lists/linux-btrfs/msg52882.html And if you want to look at allocation in a different way, this might be interesting: https://github.com/knorrie/btrfs-heatmap/blob/master/show_usage.py On Mon, May 23, 2016 at 3:34 PM, Marco Lorenzo Crociani <mar...@prismatelecomtesting.com> wrote: > Hi, > as I wrote today in IRCI experienced an issue with 'btrfs filesystem usage'. > I have a 4 partitions RAID10 btrfs filesystem almost full. > 'btrfs filesystem usage' reports wrong "Unallocated" indications. > > Linux 4.5.3 > btrfs-progs v4.5.3 > > > # btrfs fi usage /data/ > > Overall: > Device size: 13.93TiB > Device allocated: 13.77TiB > Device unallocated: 167.54GiB > Device missing: 0.00B > Used: 13.44TiB > Free (estimated): 244.39GiB (min: 244.39GiB) > Data ratio: 2.00 > Metadata ratio: 2.00 > Global reserve: 512.00MiB (used: 0.00B) > > Data,single: Size:8.00MiB, Used:0.00B > /dev/sda4 8.00MiB > > Data,RAID10: Size:6.87TiB, Used:6.71TiB > /dev/sda4 1.72TiB > /dev/sdb3 1.72TiB > /dev/sdc3 1.72TiB > /dev/sdd3 1.72TiB > > Metadata,single: Size:8.00MiB, Used:0.00B > /dev/sda4 8.00MiB > > Metadata,RAID10: Size:19.00GiB, Used:14.15GiB > /dev/sda4 4.75GiB > /dev/sdb3 4.75GiB > /dev/sdc3 4.75GiB > /dev/sdd3 4.75GiB > > System,single: Size:4.00MiB, Used:0.00B > /dev/sda4 4.00MiB > > System,RAID10: Size:16.00MiB, Used:768.00KiB > /dev/sda4 4.00MiB > /dev/sdb3 4.00MiB > /dev/sdc3 4.00MiB > /dev/sdd3 4.00MiB > > Unallocated: > /dev/sda4 1.76TiB > /dev/sdb3 1.76TiB > /dev/sdc3 1.76TiB > /dev/sdd3 1.76TiB > > ---------------------------------------------------------------------------------- > # btrfs fi show /data/ > Label: 'data' uuid: df6639d5-3ef2-4ff6-a871-9ede440e2dae > Total devices 4 FS bytes used 6.72TiB > devid 1 size 3.48TiB used 3.44TiB path /dev/sda4 > devid 2 size 3.48TiB used 3.44TiB path /dev/sdb3 > devid 3 size 3.48TiB used 3.44TiB path /dev/sdc3 > devid 4 size 3.48TiB used 3.44TiB path /dev/sdd3 > > ---------------------------------------------------------------------------------- > # btrfs fi df /data/ > Data, RAID10: total=6.87TiB, used=6.71TiB > Data, single: total=8.00MiB, used=0.00B > System, RAID10: total=16.00MiB, used=768.00KiB > System, single: total=4.00MiB, used=0.00B > Metadata, RAID10: total=19.00GiB, used=14.15GiB > Metadata, single: total=8.00MiB, used=0.00B > GlobalReserve, single: total=512.00MiB, used=0.00B > > ---------------------------------------------------------------------------------- > # df -h > /dev/sda4 7,0T 6,8T 245G 97% /data > > Regards, > > -- > Marco Crociani > Prisma Telecom Testing S.r.l. > via Petrocchi, 4 20127 MILANO ITALY > Phone: +39 02 26113507 > Fax: +39 02 26113597 > e-mail: mar...@prismatelecomtesting.com > web: http://www.prismatelecomtesting.com > > Questa email (e I suoi allegati) costituisce informazione riservata e > confidenziale e può essere soggetto a legal privilege. 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