NEC Express5800/R120h-2M Maintenance Manual page 79

Chapter 2 Useful Features
(3)
Memory Options Menu
When you select System Configuration > BIOS/Platform Configuration (RBSU) > System Options >
Memory Options from the System Utilities, the Memory Options menu appears.
For details about the options, see the table below.
Option
Advanced Memory
Protection
Memory Refresh Rate
Channel Interleaving
Maximum Memory Bus
Frequency
Memory Patrol
Scrubbing
Parameter
Fast Fault Tolerant (ADDDC)
[Advanced ECC Support]
Online Spare with Advnced ECC
Support
Mirrored Memory with Advanced
ECC Support
[1x Refresh]
2x Refresh
[Enabled]
Disabled
[Auto]
2667 MHz
2400MHz
2133 MHz
1867 MHz
[Enabled]
Disabled
Express5800/R120h-1M, R120h-2M Maintenance Guide
Description
Use this option to configure additional memory
protection with ECC (Error Checking and
Correcting). Options and support vary per
system. Advanced ECC keeps all installed
memory available for use while still protecting the
system against all single-bit failures and certain
multi-bit failures. Online Spare Memory enables a
system to automatically map out a group of
memory that is detected to be at an increased risk
of receiving uncorrected memory errors based on
an advanced analysis of corrected memory errors.
The mapped out memory is automatically replaced
by a spare group of memory without interrupting the
system. Mirrored Memory provides the maximum
protection against uncorrected memory errors that
might otherwise result in a system failure. Fault
Tolerant Advanced Double Device Data Correction
(ADDDC) enables the system to correct memory
errors and continue to operate in cases of multiple
DRAM device failures on a DIMM. This provides
protection against uncorrectable memory errors
beyond what is available with Advanced ECC.
This option controls the refresh rate of the memory
controller and might affect the performance and
resiliency of the server memory. It is recommended
that you leave this setting in the default state unless
indicated in other documentation for this server.
You can only configure this option if the Workload
Profile is set to Custom. Use this option to modify
the level of interleaving for which the memory
system is configured. Typically, higher levels of
memory interleaving result in maximum
performance. However, reducing the level of
interleaving can result in power savings.
You can only configure this option if the Workload
Profile is set to Custom. Use this option to
configure the memory system to run memory at a
lower maximum speed than that supported by the
installed processor and DIMM configuration.
Setting this option to Auto configures the system to
run memory at the maximum speed supported.
This option corrects memory soft errors so that,
over the length of the system runtime, the risk of
producing multi-bit and uncorrectable errors is
reduced.
1. System Utilities
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