NEC Express5800/A2000 Przewodnik Konfiguracji Pobierz pdf (Strona 54)

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

NEC Corporation Revision 8.0 – April 2015

2. Memory on the Memory Riser Card (DIMM): Priority/Order of Installation

The priority/order to install DIMM on a Memory Riser Card depends on memory configuration.

Memory Configuration Mode consists of 2; “Independent Mode” for high performance and “Lockstep Mode”

for high availability

Under each mode, there are 2 features to improve availability further; “Memory Mirroring” and “Memory Rank

Sparing”.

2-1. Lockstep Mode

“Lockstep Mode” supports Error Detect/Correct toward 2x DRAM failures (DDDC) by having a pair of memory

defined among 2x memory channels (CH0 and CH1 or CH2 and CH3) operating in parallel. To use this mode,

need to order memory set including 2 DIMMs per set.

NOTE:

 Cannot mix RDIMM and LRDIMM in a server

 Lockstep Mode is a standard setting at the server delivery.

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.

2-2. Independent Mode

“Independent Mode” provides more performance by having 4 memory channels operate independently. This

supports Error Detect/Correct toward 1x DRAM failure (SDDC). To use this mode, need to order memory set

including 2 DIMMs per set.

NOTE:

 Cannot mix RDIMM and LRDIMM in a server

 Lockstep Mode is a standard setting at the server delivery. To use Independent Mode, need to change

the mode from BIOS set-up menu.

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. Otherwise, memory might not be able to be identified.

DIMM Installation Order for Independent Mode (only) /Lockstep Mode (only)

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 73 74

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NEC Express5800/A2000 Przewodnik Konfiguracji Strona 54