On 2017-10-31 23:18, Tomasz Chmielewski wrote:
On 2017-09-18 17:20, Tomasz Chmielewski wrote:
# df -h /var/lib/lxd
FWIW, standard (aka util-linux) df is effectively useless in a
situation
such as this, as it really doesn't give you the information you need
(it
can say you have lots of space available, but if btrfs has all of it
allocated into chunks, even if the chunks have space in them still,
there
can be problems).
I see here on RAID-1, "df -h" it shows pretty much the same amount of
free space as "btrfs fi show":
- "df -h" shows 105G free
- "btrfs fi show" says: Free (estimated): 104.28GiB
(min: 104.28GiB)
But chances are pretty good that one you get that patch integrated,
whether by integrating it yourself to what you have currently, or by
trying 4.14-rc1 or waiting until it hits release or stable, that bug
will
have been squashed! =:^)
OK, will wait for 4.14.
So I've tried to run balance with 4.14-rc6.
I've also tried with 4.14-rc7 on a server which was failing with "no
space left" - unfortunately, it's still failing:
# time btrfs balance start /srv
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 scope of balance.
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 '/srv': No space left on device
There may be more info in syslog - try dmesg | tail
real 8731m13.424s
user 0m0.000s
sys 560m36.363s
# dmesg -c
(...)
[546228.496902] BTRFS info (device sda4): relocating block group
297455845376 flags data|raid1
[546251.393541] BTRFS info (device sda4): found 107799 extents
[546512.346360] BTRFS info (device sda4): found 107799 extents
[546529.407077] BTRFS info (device sda4): relocating block group
296382103552 flags metadata|raid1
[546692.465746] BTRFS info (device sda4): found 35202 extents
[546733.294172] BTRFS info (device sda4): found 2586 extents
[546738.487556] BTRFS info (device sda4): relocating block group
295308361728 flags data|raid1
[546770.474409] BTRFS info (device sda4): found 140906 extents
[547037.744023] BTRFS info (device sda4): found 140906 extents
[547065.840993] BTRFS info (device sda4): 117 enospc errors during
balance
# btrfs fi df /srv
Data, RAID1: total=2.46TiB, used=2.35TiB
System, RAID1: total=32.00MiB, used=416.00KiB
Metadata, RAID1: total=19.00GiB, used=12.92GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
# btrfs fi show /srv
Label: 'btrfs' uuid: 105b2e0c-8af2-45ee-b4c8-14ff0a3ca899
Total devices 2 FS bytes used 2.36TiB
devid 1 size 2.63TiB used 2.48TiB path /dev/sda4
devid 2 size 2.63TiB used 2.48TiB path /dev/sdb4
# btrfs fi usage /srv
Overall:
Device size: 5.25TiB
Device allocated: 4.96TiB
Device unallocated: 302.00GiB
Device missing: 0.00B
Used: 4.72TiB
Free (estimated): 268.66GiB (min: 268.66GiB)
Data ratio: 2.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data,RAID1: Size:2.46TiB, Used:2.35TiB
/dev/sda4 2.46TiB
/dev/sdb4 2.46TiB
Metadata,RAID1: Size:19.00GiB, Used:12.92GiB
/dev/sda4 19.00GiB
/dev/sdb4 19.00GiB
System,RAID1: Size:32.00MiB, Used:416.00KiB
/dev/sda4 32.00MiB
/dev/sdb4 32.00MiB
Unallocated:
/dev/sda4 151.00GiB
/dev/sdb4 151.00GiB
Tomasz Chmielewski
https://lxadm.com
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