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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
108 DS8800 Performance Monitoring and Tuning
Figure 4-5 Single rank RAID-level comparison for a 4 KB random workload with 100% reads
These numbers are not DS8000 specific, because they represent the limits that you can
expect from a simple set of eight physical disks that form a RAID array. As outlined in 2.4.5,
“SAS 2.5 inch drives compared to FC 3.5 inch drives” on page 39, you can expect slightly
higher maximum I/O rates with 2.5 inch small form factor (SFF) 146 GB 15k SAS drives as
used in DS8800 systems.
For small block random read workloads, there is no significant performance difference
between RAID 5, RAID 6, and RAID 10, as seen in Figure ...
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Publisher Resources

ISBN: 0738436836Purchase book