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IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
book

IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning

by Cathy Warrick, Craig Gordon, Benoit Granier, Keitaro Imai, Rosemary McCutchen, Brannen Proctor, Jim Sedgwick, Paulus Usong, Mary Ann Vandermark, John Wickes
December 2005
Intermediate to advanced content levelIntermediate to advanced
530 pages
18h 34m
English
IBM Redbooks
Content preview from IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
374 IBM 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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ISBN: 0738494119Purchase book