check_disk confused by negative disk space, fix or workaround?

[Thomas Guyot-Sionnest]

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On 25/08/07 11:33 AM, Kelly Jones wrote:
> Nagios' check_disk plug-in gets confused when "df -k" reports negative
> space remaining on a drive. For example, if df -k says:
> 
> /dev/ccd0 567673758 524004492 -1744634 100% /partname
> 
> nagios' check_disk says:
> 
> DISK OK - free space: /partname 17592186042712 MB (-1% inode=97%)
> 
> Is there a workaround here? Can check_disk be told to throw an error
> if the remaining space *exceeds* a certain number? Can I tell it "if
> you see more than 1 terabyte available, something is wrong [because
> the machine in question doesn't have that much disk space], so report
> an error"?
> 
> (Unix, of course, reserves space for the root user, so negative space
> remaining just means all the user space has been used up + then some)

What system are you using? My df command never returns negative values
so I couldn't make a simple test case...

This is likely a matter of using signed integers and/or checking
properly the value. No need for a maximum value.

Thomas
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