In Debian we got reported (https://bugs.debian.org/800345) the following
bugreport by Klaus Ethgen:
Since several days, one of my checks went red for one of my boxes,
mentioned that / is 100% full. But this is not true, there is plenty of
space left.
~> df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda1 btrfs 502M 338M 169M 67% /
...
~> btrfs fi df /
System, single: total=4.00MiB, used=4.00KiB
Data+Metadata, single: total=497.81MiB, used=329.71MiB
GlobalReserve, single: total=8.00MiB, used=0.00B
~> /usr/lib/nagios/plugins/check_disk -w '3%' -c '1%'
DISK CRITICAL - free space: / 0 MB (0% inode=-)]; ...
~> grep ' / ' /proc/mounts
/dev/sda1 / btrfs
rw,nodiratime,relatime,compress=zlib,ssd,discard,space_cache,autodefrag 0
0
All other partitions worked well but it constantly shows / to be full.
~> /usr/lib/nagios/plugins/check_disk -w '3%' -c '1%' -vvv
Thresholds(pct) for / warn: 3,000000 crit 1,000000
calling stat on /
For /, used_pct=100 free_pct=0 used_units=337 free_units=0
total_units=501 used_inodes_pct=-1 free_inodes_pct=101
fsp.fsu_blocksize=4096 mult=1048576
Freespace_units result=0
Freespace% result=2
Usedspace_units result=0
Usedspace_percent result=0
Usedinodes_percent result=0
Freeinodes_percent result=0
And to give you what stat gives:
~> stat -f /
File: "/"
ID: a446833a80ceeb6a Namelen: 255 Type: btrfs
Block size: 4096 Fundamental block size: 4096
Blocks: Total: 128472 Free: 42014 Available: 43031
Inodes: Total: 0 Free: 0
I think, I found the bug.
line 1044:
p->available = fsp->fsu_bavail > fsp->fsu_bfree ? 0 : fsp->fsu_bavail;
But from the stat I see that:
... Free: 41708 Available: 42725
I think, that BDE^HD workarround here is broken for btrfs and maybe
other filesystems that supports compression.
--
Reply to this email on GitHub:
https://github.com/monitoring-plugins/monitoring-plugins/issues/1357
