

It seems to me if i add extra output fields it breaks it. Have you tried running it by hand (you'll need to redirect output to a file since the output filename is '-')?
These syscalls, in turn result in cache-unfriendly (random-seeming) I/O access, which defeats most OS and hardware caching algorithms.
The main focus of this page is to examine how RRDtool performs in the large scale and propose some solutions.
The ability to gather and store this much data is a testament to rrdtool's ease of use.
While RRDtool performs very well for small- and medium-sized installations, the RRD update mechanism requires a surprising number of I/O syscalls for each operation.
For this reason, to obtain the data requires knowledge of where the VM is running.
The RRDs can be extracted via a http handler registered at /host_rrd or /vm_rrd.
There are other SNMP variables monitored, but the majority of our monitoring is looking at these variables on the edge of the network.
This amounts to about 500,000 snmp variables being monitored.
If not you should take a look at this tutorial (if you are in a hurry look at the "A Real World Example" section) or any of the tutorials on this page.
Setup and introduction You need to have PHP compiled with RRDTool support to run the following PHP examples.