[mrtg] extended math in a Target definition

Quinlan D DanielQ at mfl.co.uk
Wed Nov 14 14:45:35 MET 2001


 I'm trying to graph memory in use using the Compaq Foundation Agents on NT
servers.  the agents only report how much memory is free, however management
want a graph of memory in use.  so i've been using the target below

cpqHoPhysicalMemorySize.0&cpqHoPagingMemorySize.0:public at db-ent -
cpqHoPhysicalMemoryFree.0&cpqHoPagingMemoryFree.0:public at db-ent

which works fine as long as the box has <= 2Gb of RAM.
cpqHoPhysicalMemorySize only reports what the OS sees and NT Server can't
address more than 2Gb of RAM in userspace (it splits it 2/2

I've found another OID in the MIBs that reports the true amount of physical
RAM, but it reports it in kilobytes whereas cpqHoPhysicalMemoryFree reports


I tried this

Target[db-ent]: (cpqSeTotalMem.0 /
1024)&cpqHoPagingMemorySize.0:public at db-ent -
cpqHoPhysicalMemoryFree.0&cpqHoPagingMemoryFree.0:public at db-ent

but MRTG barfs with syntax errors, doesn't work without the brackets either.

The config file is automatically generated by our Inventory system so I
could just put in pre-calculated numbers for the sizes of the Physcial
Memory and Paging file. so I tried

Target[db-ent]: 4096&3963 -
cpqHoPhysicalMemoryFree.0&cpqHoPagingMemoryFree.0:public at db-ent

MRTG doesn't complain but I just get zeros in the log file and an empty

any ideas???

Daniel Quinlan

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