On Sat, Dec 02, 2017 at 09:47:19 +0800, Qu Wenruo wrote:
>> Actually I should rephrase the problem:
>>
>> "snapshot has taken 8 GB of space despite nothing has altered source subvolume"
Actually, after:
# btrfs balance start -v -dconvert=raid1 /
ctrl-c on block group 35G/113G
# btrfs balance start -v -dconvert=raid1,soft /
# btrfs balance start -v -dusage=55 /
Done, had to relocate 1 out of 56 chunks
# btrfs balance start -v -musage=55 /
Done, had to relocate 2 out of 55 chunks
and waiting a few minutes after ...the 8 GB I've lost yesterday is back:
# btrfs fi sh /
Label: none uuid: 17a3de25-6e26-4b0b-9665-ac267f6f6c4a
Total devices 2 FS bytes used 44.10GiB
devid 1 size 64.00GiB used 54.00GiB path /dev/sda2
devid 2 size 64.00GiB used 54.00GiB path /dev/sdb2
# btrfs fi usage /
Overall:
Device size: 128.00GiB
Device allocated: 108.00GiB
Device unallocated: 20.00GiB
Device missing: 0.00B
Used: 88.19GiB
Free (estimated): 18.75GiB (min: 18.75GiB)
Data ratio: 2.00
Metadata ratio: 2.00
Global reserve: 131.14MiB (used: 0.00B)
Data,RAID1: Size:51.97GiB, Used:43.22GiB
/dev/sda2 51.97GiB
/dev/sdb2 51.97GiB
Metadata,RAID1: Size:2.00GiB, Used:895.69MiB
/dev/sda2 2.00GiB
/dev/sdb2 2.00GiB
System,RAID1: Size:32.00MiB, Used:16.00KiB
/dev/sda2 32.00MiB
/dev/sdb2 32.00MiB
Unallocated:
/dev/sda2 10.00GiB
/dev/sdb2 10.00GiB
# btrfs dev usage /
/dev/sda2, ID: 1
Device size: 64.00GiB
Device slack: 0.00B
Data,RAID1: 51.97GiB
Metadata,RAID1: 2.00GiB
System,RAID1: 32.00MiB
Unallocated: 10.00GiB
/dev/sdb2, ID: 2
Device size: 64.00GiB
Device slack: 0.00B
Data,RAID1: 51.97GiB
Metadata,RAID1: 2.00GiB
System,RAID1: 32.00MiB
Unallocated: 10.00GiB
# btrfs fi df /
Data, RAID1: total=51.97GiB, used=43.22GiB
System, RAID1: total=32.00MiB, used=16.00KiB
Metadata, RAID1: total=2.00GiB, used=895.69MiB
GlobalReserve, single: total=131.14MiB, used=0.00B
# df
/dev/sda2 64G 45G 19G 71% /
However the difference is on active root fs:
-0/291 24.29GiB 9.77GiB
+0/291 15.99GiB 76.00MiB
Still, 45G used, while there is (if I counted this correctly) 25G of data...
> Then please provide correct qgroup numbers.
>
> The correct number should be get by:
> # btrfs quota enable <mnt>
> # btrfs quota rescan -w <mnt>
> # btrfs qgroup show -prce --sync <mnt>
OK, just added the --sort=excl:
qgroupid rfer excl max_rfer max_excl parent child
-------- ---- ---- -------- -------- ------ -----
0/5 16.00KiB 16.00KiB none none --- ---
0/361 22.57GiB 7.00MiB none none --- ---
0/358 22.54GiB 7.50MiB none none --- ---
0/343 22.36GiB 7.84MiB none none --- ---
0/345 22.49GiB 8.05MiB none none --- ---
0/357 22.50GiB 9.27MiB none none --- ---
0/360 22.57GiB 10.27MiB none none --- ---
0/344 22.48GiB 11.09MiB none none --- ---
0/359 22.55GiB 12.57MiB none none --- ---
0/362 22.59GiB 22.96MiB none none --- ---
0/302 12.87GiB 31.23MiB none none --- ---
0/428 15.96GiB 38.68MiB none none --- ---
0/294 11.09GiB 47.86MiB none none --- ---
0/336 21.80GiB 49.59MiB none none --- ---
0/300 12.56GiB 51.43MiB none none --- ---
0/342 22.31GiB 52.93MiB none none --- ---
0/333 21.71GiB 54.54MiB none none --- ---
0/363 22.63GiB 58.83MiB none none --- ---
0/370 23.27GiB 59.46MiB none none --- ---
0/305 13.01GiB 61.47MiB none none --- ---
0/331 21.61GiB 61.49MiB none none --- ---
0/334 21.78GiB 62.95MiB none none --- ---
0/306 13.04GiB 64.11MiB none none --- ---
0/304 12.96GiB 64.90MiB none none --- ---
0/303 12.94GiB 68.39MiB none none --- ---
0/367 23.20GiB 68.52MiB none none --- ---
0/366 23.22GiB 69.79MiB none none --- ---
0/364 22.63GiB 72.03MiB none none --- ---
0/285 10.78GiB 75.95MiB none none --- ---
0/291 15.99GiB 76.24MiB none none --- --- <- this one (default rootfs) got fixed
0/323 21.35GiB 95.85MiB none none --- ---
0/369 23.26GiB 96.12MiB none none --- ---
0/324 21.36GiB 104.46MiB none none --- ---
0/327 21.36GiB 115.42MiB none none --- ---
0/368 23.27GiB 118.25MiB none none --- ---
0/295 11.20GiB 148.59MiB none none --- ---
0/298 12.38GiB 283.41MiB none none --- ---
0/260 12.25GiB 3.22GiB none none --- --- <- 170712, initial snapshot, OK
0/312 17.54GiB 4.56GiB none none --- --- <- 170811, definitely less excl
0/388 21.69GiB 7.16GiB none none --- --- <- this one has <100M exclusive
So the one block of data was released, but there are probably two more
stuck here. If the 4.5G and 7G were freed I would have 45-4.5-7=33G used,
which would agree with the 25G of data I've counted manually.
Any ideas how to look inside these two snapshots?
> Rescan and --sync are important to get the correct number.
> (while rescan can take a long long time to finish)
# time btrfs quota rescan -w /
quota rescan started
btrfs quota rescan -w / 0.00s user 0.00s system 0% cpu 30.798 total
> And further more, please ensure that all deleted files are really deleted.
> Btrfs delay file and subvolume deletion, so you may need to sync several
> times or use "btrfs subv sync" to ensure deleted files are deleted.
Yes, I was aware about that. However I've never had to wait after rebalance...
regards,
--
Tomasz Pala <gotar@xxxxxxxxxxxxx>
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