[Nagiosplug-devel] [ nagiosplug-Bugs-1348746 ] check_disk reports incorrect disk free with neg space on BSD

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Bugs item #1348746, was opened at 2005-11-04 16:59
Message generated for change (Comment added) made by secabeen
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Category: Parsing problem
Group: Release (specify)
Status: Open
Resolution: None
Priority: 5
Submitted By: Ted Cabeen (secabeen)
Assigned to: Nobody/Anonymous (nobody)
Summary: check_disk reports incorrect disk free with neg space on BSD

Initial Comment:
With check_disk running on FreeBSD 5-STABLE, when a
disk has negative free space remaining, the amount of
free space goes hugely positive:
DISK CRITICAL - free space: /usr 36028797018963968 MB
(1191472380510208%):

Here's a df from the time:
/dev/ad4s1g          3096462   2989082  -140336   105%
   /usr

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>Comment By: Ted Cabeen (secabeen)
Date: 2005-11-07 13:25

Message:
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user_id=40466

All modern unix file-systems reserve a portion (5-10%) of
the disk space for use by root only and to speed disk
accesses.  If the root user exceeds the normal disk space
and uses some of the reserve space, the system will
represent the amount of free space as negative.  

I don't know how check_disk is checking the disk space (df
or internal routines).  Is there an easy way to check?

check_disk (nagios-plugins 1.4.2) 1.57 is the version I'm
running.

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Comment By: M. Sean Finney (seanius)
Date: 2005-11-07 04:56

Message:
Logged In: YES 
user_id=226838

hi,

um, i just have to ask.  how do you have negative free space?  

some other information that would be helpful:
- is check_disk using the df command or internal disk space
routines?
- if df, what df command syntax is check_disk using?
- what version of the plugins are you using?

i believe that the plugin is making an assumption that the
amount of disk space available is unsigned, because, er...
well i'd never heard of negative disk space, anyway :)

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