March 2008
Intermediate to advanced
326 pages
10h 22m
English
book
SAN Volume Controller: Best Practices and Performance Guidelines
by Jon Tate, Deon George, Thorsten Hoss, Ronda Hruby, Ian MacQuarrie, Barry Mellish, Peter Mescher
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Chapter 5.12.4. Storage controller back end
Page 82
82 SAN Volume Controller: Best Practices and Performance Guidelines Figure 5- 10 Throughput 5.12.4 Storage controller back end The back- end I/ O rate is the rate of I/ O between storage subsystem cache and the storage arrays. Write activity to back- end disk is from cache and is normally an asynchronous operation to move data from cache to free space in NVS. One of the more common conditions that can impact overall performance is array overdriving. TPC allows metrics to be collected and graphed for individual arrays. Figure 5- 11 on page 83 is a TPC graph showing response times for an individual ESS array.
Page 83
Chapter 5. Storage controller 83 Figure 5- 11 ESS array response time Array response ...
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