Troubleshooting guide

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Cisco UCS B22 Blade Server Installation and Service Note

OL-27513 -01

Removing a Blade Server Cover

Figure 17 shows a logical view of the DIMMs and Channels

Figure 17 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 B22 blade server supports 3 channels of 2 memory slots each. In a 1 DPC

configuration, DIMMs are in slot 0 only. In a 2 DPC configuration, DIMMs are in both slot 0 and slot 1.

Table 5 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 be configured in complete banks for optimal performance.

• Your selected CPU(s) can have some affect on performance.

Bank 2

Bank 1

Channel A

Channel B

Channel C

Channel D

Channel E

Channel F

CPU 1

CPU 2

333341

Table 5 Preferred DIMM Population Order

DIMMs per CPU CPU 1 installed slots CPU 2 installed slots

1B0 F0

2 B0, C0 F0, G0

3 B0, C0, D0 F0, G0, H0

4 B0, C0, D0, B1 F0, G0, H0, F1

5 B0, C0, D0, B1, C1 F0, G0, H0, F1, G1

6 B0, C0, D0, B1, C1, D1 F0, G0, H0, F1, G1, H1