TM <tmjuju <at> yahoo.com> writes:
# btrfs fi df /mnt/dls
Data: total=712.01GB, used=711.24GB
System, DUP: total=8.00MB, used=80.00KB
System: total=4.00MB, used=0.00
Metadata, DUP: total=1.00GB, used=998.53MB
Metadata: total=8.00MB, used=0.00
btrfs fi show
Label: 'tm_0' uuid: f2866a33-fe53-4fc0-98bf-52d347b43824
Total devices 1 FS bytes used 712.21GB
devid 1 size 1.82TB used 714.04GB path /dev/sdb1
...
[root@microserver mnt]# btrfs balance start -dusage=5 /mnt/dls/
Done, had to relocate 0 out of 716 chunks
[root@microserver mnt]# btrfs balance start -dusage=10 /mnt/dls/
Done, had to relocate 0 out of 716 chunks
[root@microserver mnt]# btrfs balance start -dusage=15 /mnt/dls/
Done, had to relocate 0 out of 716 chunks
[root@microserver mnt]# btrfs balance start -dusage=25 /mnt/dls/
Done, had to relocate 0 out of 716 chunks
[root@microserver mnt]# btrfs balance start -dusage=35 /mnt/dls/
Done, had to relocate 1 out of 716 chunks
...
Meanwhile situation got worst
..
[root@microserver ~]# btrfs fi df /mnt/dls/
Data: total=713.01GB, used=712.23GB
System, DUP: total=8.00MB, used=80.00KB
System: total=4.00MB, used=0.00
Metadata, DUP: total=1.00GB, used=999.31MB
Metadata: total=8.00MB, used=0.00
and I kept getting more messages
dmesg |grep "block rsv returned -28" |wc -l
60
(I had stared with only 9 messages just a few hours ago)
So I decided to remove files
I started to remove (rm -rfv) thousands of files and directories
At first the rate was about 1 filedelete per second...
Always monitoring usage while deleteing
Utilll I got down to:
# btrfs fi df /mnt/dls/
Data: total=712.01GB, used=638.04GB
System, DUP: total=8.00MB, used=80.00KB
System: total=4.00MB, used=0.00
Metadata, DUP: total=1.00GB, used=895.24MB
Metadata: total=8.00MB, used=0.00
And then the filesystem became responsive again
Back to 100MBps range from ~1MBps
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