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DS8800 Performance Monitoring and Tuning
book

DS8800 Performance Monitoring and Tuning

by Gero Schmidt, Bertrand Dufrasne, Jana Jamsek, Peter Kimmel, Hiroaki Matsuno, Flavio Morais, Lindsay Oxenham, Antonio Rainero, Denis Senin
July 2012
Intermediate to advanced content levelIntermediate to advanced
726 pages
26h 28m
English
IBM Redbooks
Content preview from DS8800 Performance Monitoring and Tuning
158 DS8800 Performance Monitoring and Tuning
5.1 General workload types
The correct understanding of the existing or planned workload is the key element of the entire
planning and sizing process. Understanding the workload means having the description of the
workload pattern:
򐂰 Expected or existing number of IOPS
򐂰 Size of the I/O requests
򐂰 Read and write ratio
򐂰 Random and sequential access ratio
򐂰 General purpose of the application and the workload
You might also collect the following information:
򐂰 Expected cache hit ratio
The number of requests serviced from cache. This number is important for read requests,
because write requests always get into the cache first. If of 1000 requests, 100 of them are
serviced from cache, you have a 10% of cache ...
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Publisher Resources

ISBN: 0738436836Purchase book