Chapter 2. zSeries 900 system structure 49
2.5.1 Memory configurations
The memory cards are located in the front and rear of the CPC cage, close to the MCM. A
z900 server can have up to four memory cards, as shown in Figure 2-15.
Figure 2-15 Memory cards
All the 20-PU MCM z900 servers have four memory buses and four memory cards, two in the
front and two in the rear of the CPC cage. The 12-PU MCM models have two memory buses
and two memory cards, one in the front and the other in the rear of the CPC cage.
Table 2-6 shows the number of memory buses, memory cards and the memory capacity
range of the z900 models.
Table 2-6 z900 models and memory cards
Each memory card can have 4 GB, 8 GB or 16 GB of capacity. All memory cards installed in a
server must have the same capacity. The total capacity installed may have more usable
memory than required for a configuration and Licensed Internal Code Configuration Control
(LIC-CC) will determine how much memory is used from each card. The sum of the LIC-CC
provided memory from each card is the amount available for use in the system.
Table 2-7 shows the storage granularity and the memory cards used on the z900 servers. The
2-bus models can have up to 32 GB, using 2 memory cards of 16 GB each. The 4-bus models
can have up to 64 GB by using 4 memory cards of 16 GB each.
z900 Model MCM Memory
Buses
Memory
Cards
Memory Capacity
Range
100, 101 to 109 12-PU 2 2 5 GB to 32 GB
110 to 116, 1C1 to 1C9 20-PU 4 4 10 GB to 64 GB
210 to 216, 2C1 to 2C9 Turbo 20-PU 4 4 10 GB to 64 GB
M
E
M
O
R
Y
1
M
E
M
O
R
Y
2
D
C
A
/
C
C
1
D
C
A
/
C
C
2
D
C
A
/
C
C
3
E
T
R
E
T
R
STIs
S
T
I
CPC Cage - rear view
Crypto
S
T
I
CE CE
CPC Cage - front view
M
E
M
O
R
Y
0
M
E
M
O
R
Y
3
C
A
P
/
S
T
I
C
A
P
/
S
T
I
S
T
I
S
T
I
S
T
I
S
T
I
MBA
SD 5
4 MB
SD1
4 MB
SD 7
4 MB
SD3
4 MB
SD 6
4 MB
SD2
4 MB
SD 4
4 MB
SD0
4 MB
MBA
MBA MBA
SC 1
SC 0
CLK
PU2 PU3
PU6
PU4
PU7
PU5
PUB PU1
PUA PU0
PU12 PU 13 PU9 PU8
PUC PU D
PU10
PUE
PU11
PUF
MCM
Memory Cards

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