Chapter 5.12.3. Performance metric guidelines
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Chapter 5. Storage controller 81 Back- end response times to arrays can usually operate in the 20- 25 millisecond range up to 60 milliseconds unless the cache hit ratio is low. 5.12.2 Establish a performance baseline I/ O rate often grows over time, and as I/ O rates increase, response times will also increase. It is important to establish a good performance baseline so that the growth effects of the I/ O workload can be monitored and trends identified that can be used to predict when additional storage performance and capacity will be required. 5.12.3 Performance metric guidelines These are some performance metric guidelines: Small block reads ( 4k to 8K) must have average response times in ...
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