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2LM and 1LM configuration rules are slightly dif

ferent.

Memory Mode (2LM)

–

In "Memory" Mode Apache Pass is configured as Volatile Memory.

–

In this mode DDR4 DIMMs act as "write back" cache to the Apache Pass on

the DIMM channel within the same memory controller only.

–

Recommended DDR4 DRAM to Apache Pass capacity ratio is 1:8.

–

Min 1 DDR4 DIMM + 1 AEP per IMC.

–

Populate DDR4 across all available memory channels to maximize

bandwidth.

–

If only 1 DDR4 is populated on the channel then populate it in slot1 (1A, 1B,

…).

Figure 135: Location of the AEP

App Direct Mode (1LM)

–

In "App Direct" Mode memory is persistent like storage and byte

addressable like memory

–

Applications are responsible for making data persistent. App Direct mode

requires OS/SW stack modifications.

–

Min 1 DDR4 DIMM per IMC (i.e. 2 DDR4 per CPU).

–

Min 1 AEP which must be on IMC0.

–

If only 1 DDR4 is populated on the channel then populate it in slot1 (1A, 1B,

…).

Main memory

RX4770 M5 Upgrade and Maintenance Manual 253

Fujitsu PRIMERGY RX4770 M5 User Manual

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