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How to identify transient workload bursts using "sysstat" command

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213
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Public
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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9

Description

It is complicated to troubleshoot a performance issue caused by a bursty workload.  As most performance statistics are the calculated averages in a period of time, mostly 1 or 5 minutes in our existing performance monitoring and troubleshooting tools. These averages can not represent the real resource bottlenecks during the bursts, thus in some cases, a more granular data collection is needed to better understand the throughpout, CPU scheduling and  CP behaviors. 

sysstat is a great tool to collect some fundamental statistics at a much more granular level, seconds or even milliseconds. 

This article describes a method to detect those transient workload spikes using sysstat command, especially those short bursts that only last for hundreds of milliseconds, or even just tens of milliseconds.