Hp ProLiant SL210t Gen8 Server Uživatelský manuál stáhnout pdf (Strana 38)

Hardware options installation 38

• Single-rank DIMM—One set of memory chips that is accessed while writing to or reading from the

memory.

• Dual-rank DIMM—Two single-rank DIMMs on the same module, with only one rank accessible at a time.

The server memory control subsystem selects the proper rank within the DIMM when writing to or reading

from the DIMM.

Dual-rank DIMMs provide the greatest capacity with the existing memory technology. For example, if current

DRAM technology supports 2-GB single-rank DIMMs, a dual-rank DIMM would be 4 GB.

Memory subsystem architecture

The memory subsystem in this node is divided into channels. Each processor supports four channels, and

each channel supports two DIMM slots.

Channel Slot Slot number

DIMM slots are identified by number and by letter. Letters identify the population order. Slot numbers are

reported by ROM messages during boot and are used for error reporting. For the DIMM slot locations, see

"DIMM slot locations ("DIMM slots" on page 12)."

Memory configurations

To optimize node availability, the node supports the following AMP modes:

• Advanced ECC—Provides the greatest memory capacity for a given DIMM size, while providing up to

4-bit error correction. This mode is the default option for this node.

• Mirrored Memory—Provides maximum protection against failed DIMMs. Uncorrectable errors in one

channel are corrected by the mirror channel.

• Lockstep—Provides enhanced protection while making all installed memory available to the operating

system. The node can continue to function if a single-bit or multi-bit memory failure within a single DRAM

device occurs.

AMP options are configured in RBSU. If the requested AMP mode is not supported by the installed DIMM

configuration, the node boots in Advanced ECC mode. For more information, see "HP ROM-Based Setup

Utility (on page 75)."

For the latest memory configuration information, see the QuickSpecs on the HP website

(http://www.hp.com/go/qs).

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Hp ProLiant SL210t Gen8 Server Uživatelský manuál Strana 38