Normally when btrfs fi show will show lost space because
your trees aren't balanced.
Balance usually reclaims that space, or most of it.
In this case, not so much.
kernel 4.17.6:
saruman:/mnt/btrfs_pool1# btrfs fi show .
Label: 'btrfs_pool1' uuid: fda628bc-1ca4-49c5-91c2-4260fe967a23
Total devices 1 FS bytes used 186.89GiB
devid 1 size 228.67GiB used 207.60GiB path /dev/mapper/pool1
Ok, I have 21GB between used by FS and used in block layer.
saruman:/mnt/btrfs_pool1# btrfs balance start -dusage=40 -v .
Dumping filters: flags 0x1, state 0x0, force is off
DATA (flags 0x2): balancing, usage=40
Done, had to relocate 1 out of 210 chunks
saruman:/mnt/btrfs_pool1# btrfs balance start -musage=60 -v .
Dumping filters: flags 0x6, state 0x0, force is off
METADATA (flags 0x2): balancing, usage=60
SYSTEM (flags 0x2): balancing, usage=60
Done, had to relocate 4 out of 209 chunks
saruman:/mnt/btrfs_pool1# btrfs fi show .
Label: 'btrfs_pool1' uuid: fda628bc-1ca4-49c5-91c2-4260fe967a23
Total devices 1 FS bytes used 186.91GiB
devid 1 size 228.67GiB used 205.60GiB path /dev/mapper/pool1
That didn't help much, delta is now 19GB
saruman:/mnt/btrfs_pool1# btrfs balance start -dusage=80 -v .
Dumping filters: flags 0x1, state 0x0, force is off
DATA (flags 0x2): balancing, usage=80
Done, had to relocate 8 out of 207 chunks
saruman:/mnt/btrfs_pool1# btrfs fi show .
Label: 'btrfs_pool1' uuid: fda628bc-1ca4-49c5-91c2-4260fe967a23
Total devices 1 FS bytes used 187.03GiB
devid 1 size 228.67GiB used 201.54GiB path /dev/mapper/pool1
Ok, now delta is 14GB
saruman:/mnt/btrfs_pool1# btrfs balance start -musage=80 -v .
Dumping filters: flags 0x6, state 0x0, force is off
METADATA (flags 0x2): balancing, usage=80
SYSTEM (flags 0x2): balancing, usage=80
Done, had to relocate 5 out of 202 chunks
saruman:/mnt/btrfs_pool1# btrfs fi show .
Label: 'btrfs_pool1' uuid: fda628bc-1ca4-49c5-91c2-4260fe967a23
Total devices 1 FS bytes used 188.24GiB
devid 1 size 228.67GiB used 203.54GiB path /dev/mapper/pool1
and it's back to 15GB :-/
How can I get 188.24 and 203.54 to converge further? Where is all that
space gone?
Thanks,
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/ | PGP 7F55D5F27AAF9D08
