I would like to know how the value of disk "busy" is calculated?
I want to use values from iostat in the monitoring (zabbix).
iostat shows averages by default and the last column is "busy %", but
the first output contains averages from the system boot til now.
# iostat -x -t da
extended device statistics
device r/s w/s kr/s kw/s qlen svc_t %b
ada0 2.5 13.8 49.0 287.9 0 45.7 2
ada1 2.6 13.8 51.7 287.9 0 39.6 2
I don't want to use "iostat -x -t da -w 20" to get averages of the last
20 seconds because it means monitoring needs to wait 20 seconds on each run.
I can use absolute values from iostat. This output is without any delay
and the monitoring SW can calculate averages between two runs. But the
last column is no busy %, it is sb/i.
# iostat -I -x -t da
extended device statistics
device r/i w/i kr/i kw/i qlen
tsvc_t/i sb/i
ada0 7403218.0 40825749.0 144647824.0 849655694.0 0
2204904.2 73121.8
ada1 7537423.0 40825749.0 152643874.5 849655694.0 0
1914301.0 69996.5
So the question is - If I want to plot "busy %" in the graph - how the
"busy" value in the first example is calculated?
Is it possible to calculate it from the numbers that I have from "iostat
-I -x" and the know time interval between two runs?
Miroslav Lachman
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