Memory mirroring offers the strongest memory
module reliability mode compared to all other modes, providing improved
uncorrectable multi-bit failure protection. In a mirrored configuration,
the total available system memory is one half of the total installed
physical memory. Half of the installed memory is used to mirror the
active memory modules. In the event of an uncorrectable error, the
system switches over to the mirrored copy. This ensures SDDC and multi-bit
protection.
The installation guidelines for memory modules are
as follows:
Memory modules must be identical in size, speed,
and technology.
DIMMs installed
in memory sockets with white release tabs must be identical and similar
rule applies for sockets with black release tabs. This ensures that
identical DIMMs are installed in matched pairs—for example, A1 with
A2, A3 with A4.
NOTE: Mirroring and Advanced ECC modes require minimum of two DIMMs per
CPU and must be populated in pairs of either two or four DIMMs per
CPU.
Table 1. Processor configurationThis table describes the memory population and its
configuration
Processor
Configuration
Memory population rules
Memory population information
Single CPU
Memory population order
{1,2}, {3,4}
See Memory mirroring note
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