5137ch02.fm
Draft Document for Review October 14, 2014 10:19 am
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IBM Power Systems E870 and E880 Technical Overview and Introduction
Table 2-8 shows the CDIMM plugging order for a Power E880 with a four system nodes:
Table 2-8 Optimal CDIMM memory quad placement for four system nodes
2.3.3 Memory activation
All the memory CDIMMs are capable of capacity upgrade on demand and must have a
minimum of 50% of its physical capacity activated. For example, the minimum installed
memory for both Power E870 and Power E880 is 256 GB of RAM, whereas they can have a
minimum of 128 GB of RAM active.
There are two activation types that can be used to accomplish this:
Static memory activations: Memory activations that are exclusive for a single server
Mobile memory activations: Memory activations that can be moved from server to server
in a power enterprise pool.
Both types of memory activations can co-reside in the same system, as long as at least 25%
of the memory activations are static. This leads to a maximum of 75% of the memory
activations as mobile.
System Node 1
Processor 0
Processor 2
Processor 3
Processor 1
Quad 1
Quad 5
Quad 2
Quad 6
Quad 3
Quad 7
Quad 4
Quad 8
1
17
2
21
3
25
4
29
System Node 2
Processor 0
Processor 2
Processor 3
Processor 1
Quad 1
Quad 5
Quad 2
Quad 6
Quad 3
Quad 7
Quad 4
Quad 8
5
18
6
22
7
26
8
30
System Node 3
Processor 0
Processor 2
Processor 3
Processor 1
Quad 1
Quad 5
Quad 2
Quad 6
Quad 3
Quad 7
Quad 4
Quad 8
9
19
10
23
11
27
12
31
System Node 4
Processor 0
Processor 2
Processor 3
Processor 1
Quad 1
Quad 5
Quad 2
Quad 6
Quad 3
Quad 7
Quad 4
Quad 8
13
20
14
24
15
28
16
32
Notes:
Memory quads 1-16 must be populated.
Memory quads on the same processor must be populated with CDIMMs of the same capacity.
