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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
120 DS8800 Performance Monitoring and Tuning
match the number of ranks (or be at least a multiple of this number). Otherwise, the result is
an imbalanced volume and workload distribution across the ranks and likely rank bottlenecks.
However, efficient host-based striping must be guaranteed in this case to spread the workload
evenly across all ranks, eventually from two or more extent pools. See 3.2.7, “Extent
allocation methods (EAMs)” on page 68 for more details about the EAMs and how the volume
data is spread across the ranks in an extent pool.
Even multi-rank extent pools provide some level of control of volume placement across the
ranks in cases where it is necessary to manually enforce a special volume allocation scheme.
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Publisher Resources

ISBN: 0738436836Purchase book