Holger Kipp wrote on 2018/06/20 17:37:
Dear Miroslav,looking at the manpage for iostat I see: %b % of time the device had one or more outstanding transactions tsvc_t/i total duration of transactions per time period, in seconds sb/i total time the device had one or more outstanding transac- tions per time period, in seconds So calculating the percentage using sb/i should be fairly easy.
If I understand it correctly, then it cannot be calculated from numbers between two independent runs of "iostat -I -x" because it gives me sb/i average from the boot time, so the calculated %b will be overall average instead of average between two runs after 60 seconds. The only possible way to calculated is to run "iostat -I -x -c 2 -w 60" where the sb/i value of the second line will be average of these last 60 seconds. But it also means monitoring probe will wait 60 seconds to get this value (each time) so it is the same problem as I described in my original post with "iostat -x".
Miroslav Lachman
Am 20.06.2018 um 16:55 schrieb Miroslav Lachman <[email protected]<mailto:[email protected]>>: 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?
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