Removal; Using Memory Ras Feature - NEC Express5800/B120f User Manual

Chapter 2 Preparations

1.5.3 Removal

To remove DIMMs, first remove the top cover, air duct, and hard disk drive cage referring to Chapter 2 (1.3.1
Removal of top cover, 1.3.2 Removal of air duct, and 1.3.3 Removal of hard disk drive cage), and then perform
steps in Chapter 2 (1.5.2 Installation) in reverse order.
After DIMMs are removed, make sure that no error message appears in POST.
If any error messages are displayed, refer to Chapter 3 (1. Error Message of POST and Virtual LCD) in
"Maintenance Guide".
Run SETUP and select Yes after selecting Advanced → Memory Configuration → Memory Retest. Restart
the CPU blade to clear the error information of the removed DIMM. (Refer to Chapter 2 (1. System BIOS) in
"Maintenance Guide".)
Set the paging file size to a value larger than the recommended value (installed memory * 1.5) (for Windows).
Refer to the Installation Guide for more information.

1.5.4 Using Memory RAS Feature

This server has RAS feature including Standard Memory feature (x4 SDDC), Memory Mirroring feature, Memory
Lock Step (x8 SDDC), and Memory Sparing feature.
SDDC (Single Device Correction) allows automatic correction of memory error (multi-bit error).
CPU1
Memory Controller
CH1
CPU1-DIMM4 CPU1-DIMM5
CPU1-DIMM1 CPU1-DIMM2
The memory area on the motherboard of the server is divided into three memory channels.
Memory Mirroring, Memory Lock Step, and Memory Sparing features keep memory redundancy between
memory channels by monitoring or altering memory active/inactive status, respectively.
Note To remove the defective DIMM, check the error message appearing in POST or NEC
ESMPRO to confirm the CPU blade on which the defective DIMM is installed.
Note Only the features that support additional memory board can be used.
CH3
CH2
CPU1-DIMM6
CPU1-DIMM3
Express5800/B120f User's Guide
1. Installing Internal Optional Devices
CPU2
1
Memory Controller
CH1 CH2
CPU2-DIMM4 CPU2-DIMM5
CPU2-DIMM1 CPU2-DIMM2
CH3
CPU2-DIMM6
CPU2-DIMM3
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