None of my Linux servers are showing IO Wait in the detailed CPU usage graphs. They’re only showing Nice, Idle, System, and User. But, doing searches through the ucd-mib.php and related files, there’s lots of mentions of iowait. It just doesn’t appear in the graphs.
What am I missing? How do I get the iowait added to the detailed CPU graphs? It’s polled via SNMP, just not graphed anywhere. If I click the “view rrd command” link on the graph page, neither iowait nor wait appear anywhere in the command.
There’s one specific server that I would really like to get this enabled on, if there’s something I have to do manually. Otherwise, if there’s a way to enable it for all systems, that would be great.