IBM 990 - Manual (Page 40)

28 IBM
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zSeries 990 Technical Guide
A book may have more memory installed than enabled. The excess amount of memory
can be installed by a Licensed Internal Code code load (sometimes called “dial-a-Gig”),
when required by the installation.
On initial installation, the amount of physical memory in a given model is nearest to the
smallest possible size.
Memory upgrades are satisfied from already installed unused memory capacity until
exhausted. When no more unused memory is available from the installed memory cards,
cards have to be upgraded to a higher capacity, or the addition of a book with additional
memory is necessary.
Table 2-1 shows examples of memory configurations (not all possible combinations are
shown). It shows that an IBM 2084 model A08 may have 16 GB of usable memory out of a
minimum of 16 GB physically installed, and that an IBM 2084 model D32, though unlikely,
may have 16 GB of usable memory out of a minimum of 64 GB physical memory.
Table 2-1 New build 2084 physical memory card distribution
Available
Capacity IBM 2084-A08
Physical Cards IBM 2084-B16
Physical Cards IBM 2084-C24
Physical Cards IBM 2084-D32
Physical Cards
16 GB 2 x 8 GB Book1: 2 x 8 GB
Book2: 2 x 8 GB Book1: 2 x 8 GB
Book2: 2 x 8 GB
Book3: 2 x 8 GB Book1: 2 x 8 GB
Book2: 2 x 8 GB
Book3: 2 x 8 GB
Book4: 2 x 8 GB
24 GB 2 x 16 GB Book1: 2 x 8 GB
Book2: 2 x 8 GB Book1: 2 x 8 GB
Book2: 2 x 8 GB
Book3: 2 x 8 GB Book1: 2 x 8 GB
Book2: 2 x 8 GB
Book3: 2 x 8 GB
Book4: 2 x 8 GB
48 GB 2 x 32 GB Book1: 2 x 16 GB
Book2: 2 x 8 GB Book1: 2 x 8 GB
Book2: 2 x 8 GB
Book3: 2 x 8 GB Book1: 2 x 8 GB
Book2: 2 x 8 GB
Book3: 2 x 8 GB
Book4: 2 x 8 GB
64 GB 2 x 32 GB Book1: 2 x 16 GB
Book2: 2 x 16 GB Book1: 2 x 16 GB
Book2: 2 x 8 GB
Book3: 2 x 8 GB Book1: 2 x 8 GB
Book2: 2 x 8 GB
Book3: 2 x 8 GB
Book4: 2 x 8 GB
80 GB n/a Book1: 2 x 32 GB
Book2: 2 x 8 GB Book1: 2 x 16 GB
Book2: 2 x 16 GB
Book3: 2 x 8 GB Book1: 2 x 16 GB
Book2: 2 x 16 GB
Book3: 2 x 8 GB
Book4: 2 x 8 GB
96 GB n/a Book1: 2 x 32 GB
Book2: 2 x 16 GB Book1: 2 x 16 GB
Book2: 2 x 16 GB
Book3: 2 x 16 GB Book1: 2 x 16 GB
Book2: 2 x 16 GB
Book3: 2 x 16 GB
Book4: 2 x 8 GB
128 GB n/a Book1: 2 x 64 GB
Book2: 2 x 64 GB Book1: 2 x 64 GB
Book2: 2 x 16 GB
Book3: 2 x 16 GB Book1: 2 x 16 GB
Book2: 2 x 16 GB
Book3: 2 x 16 GB
Book4: 2 x 16 GB
Note: The amount of memory available for use in the server is the sum of all enabled
memory on all memory cards in all books.