NEC Express5800/GT110b User's Guide download pdf (Page 336)

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9-46 Upgrading Your Server

Maximum Memory Capacity

The available memory capacity depends on the basic architecture of the server (x86 architecture)

and specifications of supported operating systems.

 Memory hole

– The x86 architecture (IA-32) adopts Memory Mapped I/O method which reserves the

fixed memory area (memory hole) for controlling various I/O devices (e.g., onboard

device and PCI devices).

– The memory hole reserves 4GB or less physical memory area as reserved memory area,

regardless of mounted memory capacity. The OS cannot access this reserved area, thus,

the available memory capacity may be less than the actual mounted memory capacity

due to the memory hole.

 Memory Reclaim feature

– The server provides Memory Reclaim feature for complementation of memory hole.

– The Memory Reclaim feature remaps physical memory addresses in the memory hole

on hardware (chipset). By remapping, the whole capacity of mounted memory can be

used.

– Note, however, the remap memory area may not be available depending on the memory

capacity supported by OS. Accordingly, the available memory capacity depends on the

supported OS.

Memory hole

(with physical 4GB memory installed)

Memory Reclaim feature

(with physical 4GB memory installed)

Note: When the OS support memory can support the

total capacity of physical memory and memory

hole.

Memory

hole

Memory capacity

available for OS:

pprox. 3.3GB

Memory capacity

unavailable for

OS: (Approx.

700MB)

Physical

memory:

4GB

Physical

memory

Physical

memory:

0GB

Memory

hole

Remap

memory

Memory capacity

unavailable for OS:

(Approx. 700MB)

Memory capacity

available for OS:

pprox. 3.3GB

Physical

memory

Physical

memory:

0GB

Physical

memory:

4GB

Remaps physical

memory in the memory

hole on hardware.

The OS can use whole

physical memory

mounted.

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