Hi,
I realize that this comes up every now and then but always for slightly
more complicated setups, or so I thought:
============================================================
# df -h /
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/luks-root 825G 389G 0 100% /
# btrfs filesystem show /
Label: 'root' uuid: 75a6d93a-5a5c-48e0-a237-007b2e812477
Total devices 1 FS bytes used 388.00GiB
devid 1 size 824.40GiB used 395.02GiB path /dev/mapper/luks-root
# blockdev --getsize64 /dev/mapper/luks-root | awk '{print $1/1024^3, "GB"}'
824.398 GB
# btrfs filesystem df /
Data, single: total=388.01GiB, used=387.44GiB
System, single: total=4.00MiB, used=64.00KiB
Metadata, single: total=2.01GiB, used=1.57GiB
GlobalReserve, single: total=512.00MiB, used=80.00KiB
============================================================
This is on a Fedora 31 (5.4.8-200.fc31.x86_64) workstation. Where did the
other 436 GB go? Or, why are only 395 GB allocated from the 824 GB device?
I'm running a --full-balance now and it's progressing, slowly. I've seen
tricks on the interwebs to temporarily add a ramdisk, run another balance,
remove the ramdisk again - but that seems hackish.
Isn't there a way to prevent this from happening? (Apart from better
monitoring, so I can run the balance at an earlier stage next time).
Thanks,
Christian.
# btrfs filesystem usage -T /
Overall:
Device size: 824.40GiB
Device allocated: 395.02GiB
Device unallocated: 429.38GiB
Device missing: 0.00B
Used: 388.00GiB
Free (estimated): 435.94GiB (min: 435.94GiB)
Data ratio: 1.00
Metadata ratio: 1.00
Global reserve: 512.00MiB (used: 0.00B)
Data Metadata System
Id Path single single single Unallocated
-- --------------------- --------- -------- -------- -----------
1 /dev/mapper/luks-root 393.01GiB 2.01GiB 4.00MiB 429.38GiB
-- --------------------- --------- -------- -------- -----------
Total 393.01GiB 2.01GiB 4.00MiB 429.38GiB
Used 386.45GiB 1.55GiB 64.00KiB
--
BOFH excuse #326:
We need a licensed electrician to replace the light bulbs in the computer room.
