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Setting
Disabled
Note: A standard test is still performed across all memory and a run-time
scrub engine is always enabled regardless of these settings.
If memory mirroring is enabled, then the mirrored copy of the data from the
damaged DIMM is used until the DIMM replaced. After the damaged DIMM is
replaced, memory mirroring copies the mirrored data back to the new DIMM.
Key configuration rules of memory mirroring are as follows:
Memory mirroring must be enabled in the BIOS (it is disabled by default).
Both memory cards must have the same total amount of memory, and must
have identical DIMMs. In other words, DIMMs must be installed in matched
quads to support memory mirroring. Partial mirroring is not supported. Refer
to Table 3-7 on page 117 for information about the exact installation order
required.
Note: Because of memory mirroring, you have only half of the total amount of
memory available. If 8 GB is installed, for example, then the operating system
sees 4 GB minus half the total XceL4v Dynamic Server Cache, if this is a
multinode system, after memory mirroring is enabled.
3.2.4 Hot-swap memory
The x3850 M2 and x3950 M2 support hot-swap memory. If a DIMM fails, it can
be replaced with a new DIMM without powering down the server. This advanced
feature allows for maximum system availability. Hot-swap memory requires that
memory mirroring be enabled. This setting can be changed as described in
section 3.2.6, "Memory configuration in BIOS" on page 121.
To easily identify whether hot-swap is enabled and the status of power to the
memory card, each memory card has a green memory hot-swap enabled LED,
and a green memory card power LED on the top panel of the memory card, as
shown in Figure 3-14 on page 116. The memory card has eject levers with
sensors, so that the system can recognize when a memory card is being
removed and power down that card's slot accordingly.
Function
Relies on standard memory test and run-time scrub engine
good
to ensure memory is
Chapter 3. Hardware configuration
119
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