Hello,
I've searched high and low about my issue, but have been unable to
turn up anything like what I'm seeing right now.
A little background: I started using BTRFS over a year ago, in RAID 1
with mixed size drives. A few months ago, I started replacing the
disks with 4 TB drives, and eventually switched over to RAID 6. I am
currently running a 6x4TB RAID6 drive configuration, which should give
me ~14.5 TB
usable, but I'm only getting around 11.
The weird thing is that It seems to completely fill 4/6 of the disks,
while leaving lots of space free on 2 of the disks. I've tried full
filesystem balances, yet the problem continues.
# btrfs fi show
Label: none uuid: 78733087-d597-4301-8efa-8e1df800b108
Total devices 6 FS bytes used 11.59TiB
devid 1 size 3.64TiB used 3.64TiB path /dev/sdd
devid 2 size 3.64TiB used 3.64TiB path /dev/sdg
devid 3 size 3.64TiB used 3.64TiB path /dev/sdf
devid 5 size 3.64TiB used 2.92TiB path /dev/sda
devid 6 size 3.64TiB used 1.48TiB path /dev/sdb
devid 7 size 3.64TiB used 3.64TiB path /dev/sdc
btrfs-progs v4.2.3
# btrfs fi df /mnt/data
Data, RAID6: total=11.67TiB, used=11.58TiB
System, RAID6: total=64.00MiB, used=1.70MiB
Metadata, RAID6: total=15.58GiB, used=13.89GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
dan@Morpheus:/mnt/data/temp$ sudo btrfs fi usage /mnt/data
# btrfs fi usage /mnt/data
WARNING: RAID56 detected, not implemented
WARNING: RAID56 detected, not implemented
WARNING: RAID56 detected, not implemented
Overall:
Device size: 21.83TiB
Device allocated: 0.00B
Device unallocated: 21.83TiB
Device missing: 0.00B
Used: 0.00B
Free (estimated): 0.00B (min: 8.00EiB)
Data ratio: 0.00
Metadata ratio: 0.00
Global reserve: 512.00MiB (used: 0.00B)
Data,RAID6: Size:11.67TiB, Used:11.58TiB
/dev/sda 2.92TiB
/dev/sdb 1.48TiB
/dev/sdc 3.63TiB
/dev/sdd 3.63TiB
/dev/sdf 3.63TiB
/dev/sdg 3.63TiB
Metadata,RAID6: Size:15.58GiB, Used:13.89GiB
/dev/sda 4.05GiB
/dev/sdb 1.50GiB
/dev/sdc 5.01GiB
/dev/sdd 5.01GiB
/dev/sdf 5.01GiB
/dev/sdg 5.01GiB
System,RAID6: Size:64.00MiB, Used:1.70MiB
/dev/sda 16.00MiB
/dev/sdb 16.00MiB
/dev/sdc 16.00MiB
/dev/sdd 16.00MiB
/dev/sdf 16.00MiB
/dev/sdg 16.00MiB
Unallocated:
/dev/sda 733.65GiB
/dev/sdb 2.15TiB
/dev/sdc 1.02MiB
/dev/sdd 1.02MiB
/dev/sdf 1.02MiB
/dev/sdg 1.02MiB
Can anyone shed some light on why a full balance (sudo btrfs balance
start /mnt/data) doesnt seem to straighten this out? Any and all help
is appreciated.
Thanks!
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