[mrtg] Target OID maths

[robert.harrowfield at axon.co.nz]

Hi,

Just a quickie, I need to do some maths on OIDs in a target that isnt a
router, for example, here is a normal target string that I use for the
diskspace on a sun server

Target[host.diskroot.avail]:
.1.3.6.1.4.1.2021.9.1.7.1&.1.3.6.1.4.1.2021.9.1.7.1:community at host

In another situation, I want to calculate AVAILABLE disk on an Alpha, that
gives me USED space and TOTAL SPACE via snmp. Therefore, I need to do some
maths (ie Total OID - Used OID&Total OID - Used OID)... I've had a go at
doing this, as per the cfg manual, but it doesnt seem to work when you are
directly specifying OID's.

Can anyone shed some light on how I should structure the target line to do
this??

Cheers
Rob

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