Appeal No. 1997-4116 Page 3
Application No. 08/589,826
BACKGROUND
The real storage of many computers can be reconfigured.
Specifically, parts of the real storage can be taken off-line
or brought on-line during operation.
The real storage of an IBM S/390 computer is divided into
storage elements, which are further divided into storage
subincrements (SIs). Each SI, in turn, is divided into page
frames. All SIs have the same number of page frames; each
page frame in one of the SIs has a corresponding page frame in
each of the other SIs.
Each page frame can hold a page of data. A fixed page
may not be paged out to external storage (and replaced with
another page) during operation of the computer; moreover, a
preferred page frame is a page frame that may hold a fixed
page. Conversely, a non-preferred page frame is one that may
contain only a page that may be paged out. Furthermore, a
preferred SI is an SI that includes at least one preferred
page frame. A non-preferred SI is one that cannot contain any
preferred page frames.
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