September 2002
Intermediate to advanced
332 pages
11h 1m
English
Content preview from IBM eServer zSeries 900 Technical Guide
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Chapter 5. Sysplex functions 187
Be prepared to provide additional z/OS CPU capacity when the workload’s CF operations
become duplexed. Provide sufficient coupling facility CP resources so that coupling facility
CP utilization remains below 50% in all CF images.
Provide “balanced” coupling facility CP capacity between duplexed pairs of CFs. Avoid
significant imbalances such as one CF with shared CPs and the other CF with dedicated
CPs, CFs with wildly disparate numbers of CPs, CFs of different machine types with very
different raw processor speed, and so forth.
As z/OS-to-CF and CF-to-CF distances increase, monitor the coupling facility link
subchannel and path-busy status. If more than 10% of all messages are being delayed on
the CF ...
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