Cisco UCS B22 M3 Blade Server
CONFIGURING the SERVER
13
Supported Configurations
(1) Without memory mirroring:
■
Select from 1 to 6 DIMMs per CPU (note that there are 6 DIMM slots per CPU)
(2) With memory mirroring:
■
Select 2 or 4 DIMMs per CPU. The DIMMs must be identical across channels for the same
banks.The DIMMs will be placed by the factory as shown in
Table 5
:
■
Select the memory mirroring option (N01-MMIRROR) as shown in
Table 4 on page 12
.
Caveats
■
For 2-CPU configurations, DIMMs must be even across the server (2, 4, 6 up to 12). For
example, you can select four 8 GB DIMMs and six 16 GB DIMMs.
■
Memory mirroring reduces the amount of available memory by 50% (quantity of DIMMs must
be even for mirroring).
■
By default, all DIMMs run at 1.35 V, which yields 1333-MHz memory speeds. To run the
memory DIMMS at 1600 MHz, you need to go into the BIOS or set the policy with UCSM
(service profile) to run in Performance Mode. This forces the DIMMs to operate at 1.5 V and
yields 1600-MHz speeds provided:
— The DIMMs are 1600-MHz devices
— The CPUs chosen support 1600-MHz operation
For more information regarding memory, see
DIMM and CPU Layout on page 34
and
DIMM Population on page 36
.
Table 5 DIMM Placement With Memory Mirroring
Number of
DIMMs per
CPU
DIMM Placement in Channels (with memory mirroring implemented).
Note that Channels B and F are not used for memory mirroring
CPU 1
CPU 2
2
1 DIMM in Channel C (C0),
1 DIMM in Channel D (D0)
1 DIMM in Channel G (G0),
1 DIMM in Channel H (H0)
4
2 DIMMs in Channel C (C0, C1),
2 DIMMs in Channel D (D0, D1)
2 DIMMs in Channel G (G0, G1),
2 DIMMs in Channel H (H0. H1)
NOTE:
System performance is optimized when the DIMM type and quantity are equal
for both CPUs, and when all channels are filled equally across the CPUs in the server.
