November 2001
Intermediate to advanced
158 pages
5h 10m
English
Content preview from IBM ESS and IBM DB2 UDB Working Together
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32 IBM ESS and IBM DB2 UDB Working Together
3.2.1 Know where your data resides
If you want optimal performance from ESS, don’t treat it totally like a “black box.” Establish a
storage allocation policy that uses as many RAID arrays as possible. Understand how DB2
tables map to underlying logical disks, and how the logical disks map to RAID arrays. One
way to simplify this process is to maintain a modest number of ESS logical disks. This is
discussed in “Criteria for selecting ESS logical disk sizes” on page 35.
3.2.2 Balance workload across ESS resources
Use the inherent parallelism and balanced approach of DB2 to help balance I/O workload
across ...
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