Acer R910 Memory modes, Memory Maximum Hot-plug Compatibility Performance Mirroring, Operation

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Memory modes

The server supports several memory features that allow flexibility in performance, redundancy, and ability to upgrade. The system BIOS can be configured as follows:

•Maximum compatibility

•Maximum performance

•Memory sparing

•Memory RAID

•Memory mirroring

Only one of these memory modes can be selected at one time and the BIOS defaults to maximum performance mode. For non-redundant modes, support is also included for memory sparing, where a portion of each memory board is reserved for failover.

The table below lists the memory hot-plug support under different memory modes.

Memory	Maximum	Maximum	Memory	Memory
Hot-plug
	Compatibility	Performance	Mirroring	RAID
Operation
Hot-add	Supported		Supported
Hot-replace			Supported	Supported
Hot-upgrade				Supported

Memory boards configured using RAID or mirroring are in redundant mode. If a memory board that is configured in a redundant mode has a DIMM or memory board fault, the memory board and/or DIMM containing the fault can be hot-removed or hot-replaced while the system is powered on.

Hot-replace means you can replace a memory board with another memory board of identical size. This operation is supported in memory RAID and memory mirroring modes.

Hot-add means you can add a memory board to a previously unoccuppied slot. This requires OS support and is supported in maximum compatibility and memory mirroring modes.

Hot-upgrade means you can replace an existing memory board with a memory board that contains more memory capacity. This requires OS support and is supported by the memory RAID mode only.