On Dec 23, 2008, at 2:11 PM, tec wrote:
> I need to create a graph to show disk utilzation.
>
> I've created a snmp datasource that  returns a disk percent idle  
> value.
>
> I need to specify an RPN value that will compute a percent busy  
> value and graph that over time.
>
> My datasoruce is named DiskPercentIdle.
>
> I tried specifying "100,-" as the RPN value in this datasource but  
> the value shown on the graph is a negative number (if the disk is  
> idle 99%, then the graph shows -1)
>
> How do I specify the RPN value to subtract DiskPercentIdle from 100  
> so I can use the remainder to represent a positive DiskPercentBusy  
> number value?

100,-,ABS

ABS will return the absolute (positive) value.
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