Hi,
Not sure if it caused by the upgrade, but I only encountered this
problem after I upgraded to Ubuntu Yakkety, which comes with a 4.8
kernel.
Linux vmhost 4.8.0-34-generic #36-Ubuntu SMP Wed Dec 21 17:24:18 UTC
2016 x86_64 x86_64 x86_64 GNU/Linux
This is the 2nd file system which showed these symptoms, so I thought
it's more than happenstance. I don't remember what I did with the
first one, but I somehow managed to fix it with balance, if I remember
correctly, but it doesn't help with this one.
FS state before any attempts to fix:
Filesystem 1M-blocks Used Available Use%
Mounted on
/dev/mapper/vmdata--vg-lxc--curlybrace 1024 1024 0 100%
/tmp/mnt/curlybrace
Resized LV, run „btrfs filesystem resize max /tmp/mnt/curlybrace”:
/dev/mapper/vmdata--vg-lxc--curlybrace 2048 1303 0 100%
/tmp/mnt/curlybrace
Notice how the usage magically jumped up to 1303 MB, and despite the
FS size is 2048 MB, the usage is still displayed as 100%.
Tried full balance (other options with -dusage had no result):
root@vmhost:~# btrfs balance start -v /tmp/mnt/curlybrace
Dumping filters: flags 0x7, state 0x0, force is off
DATA (flags 0x0): balancing
METADATA (flags 0x0): balancing
SYSTEM (flags 0x0): balancing
WARNING:
Full balance without filters requested. This operation is very
intense and takes potentially very long. It is recommended to
use the balance filters to narrow down the balanced data.
Use 'btrfs balance start --full-balance' option to skip this
warning. The operation will start in 10 seconds.
Use Ctrl-C to stop it.
10 9 8 7 6 5 4 3 2 1
Starting balance without any filters.
ERROR: error during balancing '/tmp/mnt/curlybrace': No space left on device
There may be more info in syslog - try dmesg | tail
No space left on device? How?
But it changed the situation:
/dev/mapper/vmdata--vg-lxc--curlybrace 2048 1302 190 88%
/tmp/mnt/curlybrace
This is still not acceptable. I need to recover at least 50% free
space (since I increased the FS to the double).
A 2nd balance attempt resulted in this:
/dev/mapper/vmdata--vg-lxc--curlybrace 2048 1302 162 89%
/tmp/mnt/curlybrace
So... it became slightly worse.
What's going on? How can I fix the file system to show real data?
Regards,
MegaBrutal
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