NEC Express5800/A2000 Konfigurationsanleitung PDF herunterladen (Seite 55)

CONFIGURATION GUIDE – NEC Express5800/A2040b, A2020b, A2010b, A1040b

NEC Corporation Revision 8.0 – April 2015

2-3. Memory Mirroring

“Memory Mirroring” provide redundancy by writing the same data into 2x memory among different memory

buffers on a Memory Riser Card. To use this feature, need to order memory set including 4 DIMMs per set

Memory Mirroring for each Memory Configuration Mode:

Independent Mode: Mirroring between CH0 and CH2, CH1 and CH3

Lockstep Mode: Mirroring between memory pair on CH0 and CH1 AND memory pair on CH2 and CH3

NOTE:

 Cannot mix RDIMM and LRDIMM in a server

 When using Memory Mirroring, the available memory capacity becomes half of physical capacity.

 Lockstep Mode + Memory Mirroring is a standard setting at the server delivery. To use Independent

Mode, need to change the mode from BIOS set-up menu.

 Cannot use both Memory Mirroring and Memory Rank Sparing at the same time.

For DIMM installation priority/order, (1) to install larger DIMM first, and (2) to install DIMMs to the sockets in

the priority/order shown in the figure below.

DIMM Installation Order for Memory Mirroring

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 73 74

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NEC Express5800/A2000 Konfigurationsanleitung Seite 55