Nagios Support Forum

Posted: **Thu Apr 16, 2015 12:56 pm**

Hi all,

I have a strange issue with the performance data of check_disk

This is the output of the plugin

root@o-kennisnet-entree:~# /usr/lib/nagios/plugins/check_disk -w 10% -c 5% -p /
DISK WARNING - free space: / 2238 MB (7% inode=38%);| /=28144MB;28806;30406;0;32007

performance data:
- space used: 28144
- warning threshold: 28806
- critical threshold: 30406

The status is "warning" but the space used value < warning threshold ?!?!

This is the output of df

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root@o-kennisnet-entree:~# df /
Filesystem                            1K-blocks     Used Available Use% Mounted on
/dev/mapper/o--kennisnet--entree-root  32776056 28820052   2292084 93% /

What is going wrong?

I'm using the following version:

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check_disk v1.4.15 (nagios-plugins 1.4.15)
Copyright (c) 1999 Ethan Galstad <[email protected]>
Copyright (c) 1999-2008 Nagios Plugin Development Team

Kind regards,
Remko

Posted: **Thu Apr 16, 2015 1:33 pm**

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[root@localhost libexec]# ./check_disk --help
check_disk v2.0.3 (nagios-plugins 2.0.3)
Copyright (c) 1999 Ethan Galstad <[email protected]>
Copyright (c) 1999-2014 Nagios Plugin Development Team
        <[email protected]>

This plugin checks the amount of used disk space on a mounted file system
and generates an alert if free space is less than one of the threshold values

check_disk is monitoring free space, not used space. If the value of free space is LESS THAN the threshold you set, that's when things are bad. Make sense?

Posted: **Thu Apr 16, 2015 3:08 pm**

Thanks for your thoughts.

I found a new parameter in version 2.0.3 of check_disk that solves my issue:

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 -f, --freespace-ignore-reserved
    Don't account root-reserved blocks into freespace in perfdata

With the new results:

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root@o-kennisnet-entree:~/nagios-plugins-2.0.3/plugins# ./check_disk -f -w 10% -c 5% -p /
DISK WARNING - free space: / 2205 MB (7% inode=38%);| /=28176MB;27343;28862;0;30382

Nagios Support Forum

check_disk - wrong performance data

check_disk - wrong performance data

Re: check_disk - wrong performance data

Re: check_disk - wrong performance data