Cisco UCS B420 M3 Blade Server
12
CONFIGURING the SERVER
Choose DIMMs and Memory Mirroring
Select the memory configuration and whether or not you want the memory mirroring option.
The supported memory DIMMs and the mirroring option are listed in
Table 4
.
When memory mirroring is enabled, the memory subsystem simultaneously writes identical data
to two adjacent 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.
Notes
■
DIMM configuration rules:
— The minimum configuration is 1 DIMM per CPU
— The order in which DIMMs must be installed in a channel is Bank 0 (blue socket),
then Bank 1 (black socket), then Bank 2 (white socket).
— You cannot mix DIMM capacities within a bank
— You can mix DIMM capacities within a channel
— You cannot mix RDIMMs with LRDIMMs
Table 4 Supported DDR3 DIMMs and Memory Mirroring Option
Product ID (PID)
PID Description
Voltage
Ranks
/DIMM
DIMM Options
UCS-ML-1X324RZ-A
32 GB DDR3-1866-MHz
1
LRDIMM/PC3-12800/4R/x4/1.35v
Notes
1. 1866-MHz DIMMs are only supported with E5-4600 v2 CPUs
1.5V
4
UCS-ML-1X324RY-A
32 GB DDR3-1600-MHz LRDIMM/PC3-12800/4R/x4/1.35
1.35/1.5 V
4
UCS-ML-1X162RZ-A
16 GB DDR3-1866-MHz
1
RDIMM/PC3-14900/2R/x4/1.5v
1.5V
2
UCS-MR-1X162RY-A
16 GB DDR3-1600-MHz RDIMM PC3-12800/2R/x4/1.35v
1.35/1.5 V
2
UCS-ML-1X082RZ-A
8 GB DDR3-1866-MHz
1
RDIMM/PC3-12800/2R/x4/1.25v
1.5 V
2
UCS-MR-1X082RY-A
8GB DDR3-1600-MHz RDIMM PC3-12800/2R/x4/1.35v
1.35/1.5 V
2
UCS-MR-1X041RY-A
4GB DDR3-1600-MHz RDIMM PC3-12800/1R/x4/1.35v
1.35/1.5 V
1
Memory Mirroring Option
N01-MMIRROR
Memory mirroring option
