November 2003
Intermediate to advanced
212 pages
6h 37m
English
book
S/390 PartnerWorld for Developers, ITSO/EFS Project EFS Systems on a Linux Base: Additional Topics
by Bill Ogden, Michael Ryan
Content preview from S/390 PartnerWorld for Developers, ITSO/EFS Project EFS Systems on a Linux Base: Additional Topics
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Chapter 2. Tuning considerations 25
Expanded storage
How much expanded storage, if any, should you define? We cannot provide a general answer
for this question. Logic might indicate that storage is better used as central storage instead of
expanded storage, but there is long-established folklore that OS/390® works better if some
expanded storage exists. (This is often related to “paging” of TSO swap sets into expanded
storage, but many other elements enter the discussion.) Also, some DB2 advocates
recommend the use of expanded storage.
A simple z/OS system, such as the AD system, works quite well without any expanded
storage. Long-term directions for zArchitecture will have no expanded storage. Most of the
exercises and tests we do for this ...
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