September 2002
Intermediate to advanced
332 pages
11h 1m
English
Content preview from IBM eServer zSeries 900 Technical Guide
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Chapter 2. zSeries 900 system structure 25
A standard SAP configuration provides a very well balanced system for most environments.
However, there are application environments with very high I/O rates (typically some TPF
environments), and in this case additional SAPs can increase the capability of the channel
subsystem to perform I/O operations. Additional SAPs can be added to a configuration by
either ordering optional SAPs or assigning some CPs as SAPs. Orderable SAPs may be
preferred since they do not incur software charges, as when CPs are assigned as SAPs.
In the z900 servers the number of SAPs can be greater than the number of CPs and the
number of used STIs. Changing the number of SAPs is
disruptive
to a z900 configuration.
Optional ...
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