Nagios Graph not displaying correct values

[Jim Avery]

On 13 December 2011 10:41, James Osbourn <james.osbourn at citrix.com> wrote:
>
> I have a weird situation where the Nagios Graph values are not the actual values for a filesystem
>
> Eg I have a filesystem and if I run a df I get
>
> $ df -h .
> Filesystem            Size  Used Avail Use% Mounted on
> filer01:/vol/data1    443G  400G   44G  91% /mnt/filer01_data1
>
> If I run the Nagios check_disk command I get the correct values
>
> # ../libexec/check_disk -w 10% -c 5% -p /usr/groups/sources
> DISK WARNING - free space: /usr/groups/sources 44073 MB (9% inode=48%);| /usr/groups/sources=409354MB;408084;430755;0;453427
>
> But when you look at the graph the figures are all wrong
>
>
> Has anyone else seen this?  I was going to look at the usage to try and forecast usage but it will now be very hard.  I have just installed Nagios Graph based on the default installation and using the default check_disk plugin.


I would guess rrdtool is applying base=1000 rather than base=1024.  See:-

http://oss.oetiker.ch/rrdtool/doc/rrdgraph.en.html

I'm not sure how you would specify that in Nagios Graph though (in
PNP4Nagios you can simply add "--base 1024" to the options in the
template).

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