S e n d d o c u m e n t c o m m e n t s t o u c s - d o c f e e d b a c k @ c i s c o . c o m
25
Cisco UCS B200 Blade Server Installation and Service Note
OL-22473-02
Removing a Blade Server Cover
Note
The memory in the upper right cannot communicate with the memory in lower left, unless both CPUs
are present.
Figure 15
shows a logical view of the DIMMs and Channels
Figure 15
Logical Representation of Logical DIMMs and Channels
DIMMs can be used in the blade server in either a one DIMM per Channel (1DPC) configuration or in
a two DIMMs per Channel (2DPC) configuration.
Each CPU in a Cisco UCS B200 blade server supports 3 channels of 2 memory slots each. In a 1 DPC
configuration, DIMMs are in slot 1 only. In a 2 DPC configuration, DIMMs are in both slot 1 and slot 2.
Table 7
shows the preferred order for installing upgrade DIMMs, and while other configurations may
work if problems arise moving them to the preferred arrangement should help.
Memory Performance
When considering the memory configuration of your blade server, there are several things you need to
consider. For example:
•
DIMMs within the blade server should all be the same type. This goes for both speed and size. Do
not mix different sized DIMMs or DIMMs with different clock rates in the same blade server. Doing
so will cause a significant loss of performance.
•
Your selected CPU(s) can have some affect on performance.
Logical DIMM 2
Logical DIMM 1
Logical DIMM 1
Logical DIMM 2
Channel A
Channel B
Channel C
Channel D
Channel E
Channel F
A1
A2
B1
B2
C1
C2
D1
D2
E1
E2
F1
F2
194242
CPU 1
CPU 2
Table 7
Preferred DIMM Population Order
DIMMs per CPU
CPU 1 installed slots
CPU 2 installed slots
1
A1
D1
2
A1, B1
D1, E1,
3
A1, B1, C1
D1, E1, F1
4
A1, A2, B1, C1
D1, D2, E1, F1
5
A1, A2, B1, B2, C1
D1, D2, E1, E2, F1
6
A1, A2, B1, B2, C1, C2
D1, D2, E1, E2, F1, F2
