NCPA Reports Incorrect Disk Free Percent

[AGray]

If I run a "df -h" on my server I received:

# df -h /app
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_lun0-lvol0
250G 237G 0 100% /app

That is 250GB total volume, with 237GB used and 0GB free, with 100% used.
You and I know that for 100% it should be 250G/250G. 237G/250G is 94.9% used.

Nagios reports that exactly (see attachment) at 94%
I know it is 100% as you can no longer write files. Not a single byte left.

I could probably add a custom script plugin to the ncpa agent to do a "df -h" and capture those metrics Size, Used, Avail, Use% and report those in. But I dont know if that is the recommended approach.

What do you all think?

[Box293]

You're not the only one that has seen this, it has been reported on GitHub.

https://github.com/NagiosEnterprises/ncpa/issues/168