Hitachi Compute Rack 220H, Руководство пользователя

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System Unit Functions 3-23
Hitachi Compute Rack 210H User’s Guide
Memory mirroring
Memory mirroring is memory duplication to continue to operate the system unit
without a shutdown in case of an uncorrectable memory error (Uncorrectable
Error: 2-bit error and so on).
These are the following conditions for using the memory mirroring function:

Memory boards should be of the same configuration for channels 0 and 1 as
well as channels 2 and 3 of each processor.

All memory boards should have the same capacity and same model.

When two processors are installed, the same memory configuration should be
applied to processor 1 and processor 2.
Memory mirroring divides memory boards into a primary mirror depending on
channels installed, and configures two channels in pairs. The relationship among
memory slots, channels, and channel pairs is as follows.
Figure 3-17: The memory pair of memory mirroring