[mrtg] Graphing disk iowait on Debian using mrtg and routers2
s.shipway at auckland.ac.nz
Mon Aug 2 23:21:04 CEST 2010
> I'm trying to graph iowait on Debian but having trouble finding
> examples. Is it best to use an
> iostat bash script or the SNMP counter (.22.214.171.124.4.1.2021.11.54.0)?
> The SNMP counter seems to be an ever increasing value. I thought it
> might be the number
> of seconds the CPU has waited for, but I'm not sure how to use this
If I remember right, this is a counter of CPU seconds. The problem you get is when you have multiple CPUs and need to normalise this to a percentage....
Graph it as a normal counter, which results in a calculated seconds per second, and use a Factor of 100 to give you a percentage on a single-CPU system. If you have a dual CPU system, use a factor of 50 (100/cpus) and so on, and set ShortLegend to %.
More information about the mrtg