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If you have authority to the STRSST command, you can use OS/400
communications trace facility to measure the time lapse between when a data
request leaves your iSeries NIC card, and when it is received back.
If the amount of time between when a request leaves the NIC card and the
time it returns is large, the network is to be implicated. If the amount of
time between the request leaving the iSeries and when it returns to the
iSeries is very short, then the iSeries would look more like the cause of the
performance problem. If the iSeries is the problem, then the performance
tools can be used to see narrow down the offending applications.
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