Specifications

Cisco UCS Cisco UCS C220 M4 High-Density Rack Server (Large Form Factor Disk Drive Model)
CONFIGURING the SERVER
15
Select DIMMs and Memory Mirroring
Select the memory configuration and whether or not you want the memory mirroring option.
The available memory DIMMs and mirroring option are listed in
Tab le 4.
Approved Configurations
(1) 1-CPU configuration without memory mirroring:
■ Select from 1 to 12 DIMMs. Refer to Memory Population Rules, page 56, for more detailed
information.
NOTE: When memory mirroring is enabled, the memory subsystem simultaneously
writes identical data to two channels. If a memory read from one of the channels
returns incorrect data due to an uncorrectable memory error, the system
automatically retrieves the data from the other channel. A transient or soft error in
one channel does not affect the mirrored data, and operation continues unless there
is a simultaneous error in exactly the same location on a DIMM and its mirrored
DIMM. Memory mirroring reduces the amount of memory available to the operating
system by 50% because only one of the two populated channels provides data.
Table 4 Available DDR4 DIMMs
Product ID (PID) PID Description Voltage
Ranks
/DIMM
DIMM Options
UCS-ML-1X324RU-A 32GB DDR4-2133-MHz LRDIMM/PC3-17000/quad rank/x4 1.2 V 4
UCS-MR-1X162RU-A 16GB DDR4-2133-MHz RDIMM/PC3-17000/dual rank/x4 1.2 V 2
UCS-MR-1X081RU-A 8GB DDR4-2133-MHz RDIMM/PC3-17000/single rank/x4 1.2 V 1
Memory Mirroring Option
N01-MMIRROR Memory mirroring option