Memory - IBM z13s Technical Manual

2.4 Memory

The maximum physical memory size is directly related to the number of CPC drawers in the
system. The Model N10 CPC drawer can contain up to 1,280 GB of physical memory. The
Model N20 single drawer system can contain up to 2,560 GB, and the Model N20 with two
drawers up to 5,120 GB of installed (physical) memory per system.
A z13s has more memory installed than the amount that is ordered. Part of the physical
installed memory is used to implement the redundant array of independent memory (RAIM)
design. As a result, for customer use, Model N10 can have up to 984 GB, Model N20 single
CPC drawer up to 2008 GB, and Model N20 with two CPC drawers up to 4056 GB.
Table 2-4 shows the maximum and minimum memory sizes that you can order for each z13s
model.
Table 2-4 z13s memory sizes
Model
N10 and N20
N10 and N20
N10 and N20
N10 only
N20 only
N20 (2) only
a. The maximum amount of Preplanned Memory capacity is 2 TB.
b. N20 with two CPC drawers (FC 1045)
The minimum physical installed memory is 160 GB per CPC drawer. The minimum initial
amount of customer memory that can be ordered is 64 GB for all z13 models. The maximum
customer memory size is based on the physical installed memory minus the RAIM (20% of
physical) and the hardware system area (HSA) memory, which has a fixed amount of 40 GB.
Table 2-5 shows the memory granularity that is based on the installed customer memory. For
more information, see the z Systems Processor Resource/Systems Manager Planning Guide
SB10-7162.
Table 2-5 Central storage granularity for z13s servers
Largest Central Storage Amount (LCSA)
LCSA <= 256 GB
256 GB < LCSA <= 512 GB
512 GB < LCSA <= 1024 GB
1024 GB < LCSA <= 2048 GB
2048 GB < LCSA <= 4096 GB
Increment (GB)
8
32
64
128
128
b
256
Chapter 2. Central processor complex hardware components
Standard (GB) Plan Ahead
64 - 88
120-344
408-600
728-984
1112-2008 1112-2008
2264-4056 2264-4056
LPAR Storage Granularity
512 MB
1 GB
2 GB
4 GB
8 GB
a
(GB)
88-88
120-344
408-600
728-984
,
53