Dell PowerEdge R940 EMC Installation and Service Manual - Page 108

Mode-specific guidelines

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Table 48. 4 socket DCPMM configurations (continued) No. of CPUs in the Server DCPMM DRAM DRAM Populati Populati Capacit on on y (GB) DCPMM Capacit y (GB) Operati ng system Memory in Memory Mode (GB) Total Memory (GB) Total Memory per CPU (GB) Ratio DRAM to Optane Memory Require s an M or L CPU Support ed in App Direct Mode Support ed in Memory Mode 4 256 GB x 32 GB x 768 4,096 4,096 4,864 1,216 1 : 5.3 L SKU Yes Yes 16 24 4 256 GB x 32 GB x 768 6,144 6,144 6,912 1,728 1 : 8 L SKU Yes Yes 24 24 4 256 GB x 64 GB x 1,536 4,096 N/A 5,632 1,408 1 : 2.7 L SKU Yes No 16 24 4 256 GB x 64 GB x 1,536 6,144 6,144 7,680 1,920 1 : 4 L SKU Yes Yes 24 24 4 256 GB x 128 GB x 3,072 6,144 N/A 9,216 2,304 1 : 2 L SKU Yes No 24 24 NOTE: There are limited configurations available for Dual Socket Servers with only one CPU populated. NOTE: DCPMM is supported on systems with 1600W and 2400W PSU configuration. Mode-specific guidelines The configurations allowed depend on the memory mode selected in the System BIOS. Table 49. Memory operating modes Memory Operating Mode Optimizer Mode Description The Optimizer Mode if enabled, the DRAM controllers operate independently in the 64-bit mode and provide optimized memory performance. NOTE: DCPMM supports only Optimizer mode. Mirror Mode Single Rank Spare Mode Multi Rank Spare Mode The Mirror Mode if enabled, the system maintains two identical copies of data in memory, and the total available system memory is one half of the total installed physical memory. Half of the installed memory is used to mirror the active memory modules. This feature provides maximum reliability and enables the system to continue running even during a catastrophic memory failure by switching over to the mirrored copy. The installation guidelines to enable Mirror Mode require that the memory modules be identical in size, speed, and technology, and they must be populated in sets of 6 per processor. Single Rank Spare Mode allocates one rank per channel as a spare. If excessive correctable errors occur in a rank or channel, while the operating system is running, they are moved to the spare area to prevent errors from causing an uncorrectable failure. Requires two or more ranks to be populated in each channel. Multi Rank Spare Mode allocates two ranks per channel as a spare. If excessive correctable errors occur in a rank or channel, while the operating system is running, they are moved to the spare area to prevent errors from causing an uncorrectable failure. Requires three or more ranks to be populated in each channel. 108 Installing and removing system components

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Table 48. 4 socket DCPMM configurations (continued)
No. of
CPUs in
the
Server
DCPMM
Populati
on
DRAM
Populati
on
DRAM
Capacit
y (GB)
DCPMM
Capacit
y (GB)
Operati
ng
system
Memory
in
Memory
Mode
(GB)
Total
Memory
(GB)
Total
Memory
per CPU
(GB)
Ratio
DRAM
to
Optane
Memory
Require
s an M
or L
CPU
Support
ed in
App
Direct
Mode
Support
ed in
Memory
Mode
4
256 GB x
16
32 GB x
24
768
4,096
4,096
4,864
1,216
1 : 5.3
L SKU
Yes
Yes
4
256 GB x
24
32 GB x
24
768
6,144
6,144
6,912
1,728
1 : 8
L SKU
Yes
Yes
4
256 GB x
16
64 GB x
24
1,536
4,096
N/A
5,632
1,408
1 : 2.7
L SKU
Yes
No
4
256 GB x
24
64 GB x
24
1,536
6,144
6,144
7,680
1,920
1 : 4
L SKU
Yes
Yes
4
256 GB x
24
128 GB x
24
3,072
6,144
N/A
9,216
2,304
1 : 2
L SKU
Yes
No
NOTE:
There are limited configurations available for Dual Socket Servers with only one CPU populated.
NOTE:
DCPMM is supported on systems with 1600W and 2400W PSU configuration.
Mode-specific guidelines
The configurations allowed depend on the memory mode selected in the System BIOS.
Table 49. Memory operating modes
Memory Operating Mode
Description
Optimizer Mode
The
Optimizer Mode
if enabled, the DRAM controllers operate
independently in the 64-bit mode and provide optimized memory
performance.
NOTE:
DCPMM supports only Optimizer mode.
Mirror Mode
The
Mirror Mode
if enabled, the system maintains two identical
copies of data in memory, and the total available system memory is
one half of the total installed physical memory. Half of the installed
memory is used to mirror the active memory modules. This feature
provides maximum reliability and enables the system to continue
running even during a catastrophic memory failure by switching
over to the mirrored copy. The installation guidelines to enable
Mirror Mode require that the memory modules be identical in size,
speed, and technology, and they must be populated in sets of 6 per
processor.
Single Rank Spare Mode
Single Rank Spare Mode
allocates one rank per channel as a
spare. If excessive correctable errors occur in a rank or channel,
while the operating system is running, they are moved to the spare
area to prevent errors from causing an uncorrectable failure.
Requires two or more ranks to be populated in each channel.
Multi Rank Spare Mode
Multi Rank Spare Mode
allocates two ranks per channel as a
spare. If excessive correctable errors occur in a rank or channel,
while the operating system is running, they are moved to the spare
area to prevent errors from causing an uncorrectable failure.
Requires three or more ranks to be populated in each channel.
108
Installing and removing system components