374IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
If a significant portion of the I/O response time is connect time, you should get an
understanding of contention from the ESS Link Statistics report (Example 10-7 on page 377)
and Channel Path Activity report (Example 10-3). ESS Link Statistics is better reporting for
multiple CEC systems
daisy chained to a Host Adapter; Channel Path Activity is better for
multiple DS6000 to a FICON channel.
10.9.3 Analyze I/O queuing activity
Example 10-2 shows the report where we can check if the IOP is saturated. An average
queue length greater than one indicates that the IOP is saturated, ...
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