1. Installing Internal Optional Devices
Express5800/R120d-2E User’s Guide
72
Chapter 2 Preparations
(3) Memory Sparing Feature
The memory sparing feature puts a memory Rank of a memory controller in each CPU into standby status as
spare devices. If an unrecoverable error occurs in a Rank in the running memory controller, the feature
automatically changes the running Rank from the failed one to a Rank in the standby state to continue the
processing.
Important
•
To use the Memory Sparing feature, additional memory board N8102-497/498
(equipped with two DIMMs of same model) is required.
•
To use the Memory Sparing feature, DIMMs to be installed should have the same
capacity.
Tips
•
The operating system recognizes the DIMMs as those with capacities less than
the actual physical capacities. (The recognized capacities vary depending on the
number of DIMMs and the physical capacity per DIMM.)
The Memory Sparing feature can be used under the following conditions:
•
DIMMs to be installed should have the same capacity.
•
Run SETUP (refer to
Chapter 2 (1. System BIOS)
in "
Maintenance Guide
"), change parameters
appropriately in the [Sparing] menu selected as shown below, save the settings.
[Advanced] – [Memory Configuration] – [Memory RAS Mode] – [Sparing]
•
Run SETUP again, and check if the status of additionally installed DIMMs shows "Sparing".
•
Installation order depends on CPU configuration. See the figure below.
The following Memory sparing cannot be configured.
•
A DIMM of different capacity is installed.
Notes on Configuring Memory Sparing
If you install or remove DIMMs that unable to configure Memory Sparing, parameter for [Memory RAS Mode] is
changed from "Spared" to "Independent".
