[mrtg] Problems with target math

[Michael Robbins]

I'm having problems using math in the target line.  The OID is the used
disk space on an NT server.  The value returned is the number of
allocation units used, and I want to multiply this by 4096 so that I'm
showing the number of bytes.

My target statement is as follows:

	Target[target.disk]:
1.3.6.1.2.1.25.2.3.1.6.3&1.3.6.1.2.1.25.2.3.1.6.3:m0nit0r at 10.10.10.10
	MaxBytes[target.disk]: 50247815168
	Options[target.disk]: gauge, growright

Running this, will result in the following in my log file:

	1026413416 547879 547879
	1026413416 547879 547879 547879 547879
	1026413401 547879 547879 547879 547879
	1026413400 547879 547879 547879 547879
	1026413100 0 0 0 0
	1026412800 0 0 0 0
	1026412500 0 0 0 0
	1026412200 0 0 0 0

The problem is I need to multiply the resulting value by 4096, so if I
change the target to:

	Target[target.disk]:
1.3.6.1.2.1.25.2.3.1.6.3&1.3.6.1.2.1.25.2.3.1.6.3:m0nit0r at 10.10.10.10 *
4096
	MaxBytes[target.disk]: 50247815168
	Options[target.disk]: gauge, growright

The resulting log file looks like this:

	1026413496 2244112384 2244112384
	1026413496 0 0 0 0
	1026413494 0 0 0 0
	1026413400 0 0 0 0
	1026413100 0 0 0 0

The first time it is run, is returns the correct values, but it never
seems to add any more values to the log.  It's not generating any
errors, and the *.html and *.png files are updated (just not with the
right data).  My only thought is that the resulting integer might be too
large for MRTG.  Is there a limit on the integer size?  Am I using the
Target Math incorrectly?

Any help is greatly appreciated.

Mike

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