HP DL380 - Manual (Page 31)

NOTE: This server contains 8 DIMM slots. You can expand server memory by installing supported Registered DDR-2 FBDIMMs.
Memory configurations
The server supports the following Advanced Memory Protection (AMP) options to optimize server availability.
Advanced ECC supporting up to 16 GB of active memory using 2-GB FBDIMMs.
Online Spare Memory providing additional protection against degrading FBDIMMs supporting up to 12 GB of active memory
and 4 GB of online spare memory utilizing 2-GB FBDIMMs.
Mirrored Memory providing protection against failed FBDIMMs supporting up to 8 GB of active memory and 8 GB of mirrored
memory utilizing 2-GB FBDIMMs.
Maximum memory capacities for all AMP modes will increase with the availability of 4-GB and 8-GB FBDIMMs, including a
maximum of 64 GB in Advanced ECC mode.
The Advanced Memory Protection option is configured in RBSU. By default, the server is set to Advanced ECC mode. For more
information, refer to HP ROM-Based Setup Utility (on page 56). If the configured AMP mode is not supported by the installed
FBDIMM configuration, the system boots in Advanced ECC mode.
The following configuration requirements apply to all AMP modes:
FBDIMMS must be ECC Registered DDR-2 SDRAM FBDIMMs.
FBDIMMs must be installed in pairs.
FBDIMM pairs in a memory bank must have identical HP part numbers.
FBDIMMS must be populated as specified for each AMP memory mode.
The memory subsystem for this server is divided into two branches. Each memory branch is essentially a separate memory controller.
The FBDIMMs map to the two branches as indicated in the following table:
Branch 0 Branch 1
FBDIMM 1A FBDIMM 5B
FBDIMM 3A FBDIMM 7B
FBDIMM 2C FBDIMM 6D
FBDIMM 4C FBDIMM 8D
This multi-branch architecture provides enhanced performance in Advanced ECC mode. The concept of multiple branches is
important for the operation of online spare mode and mirrored memory mode.
If the server contains more than 4 GB of memory, consult the operating system documentation about accessing the full amount of
installed memory.
Advanced ECC memory
Advanced ECC memory is the default memory protection mode for this server. In Advanced ECC, the server is protected against
correctable memory errors. The server provides notification if the level of correctable errors exceeds a pre-defined threshold rate. The
server does not fail because of correctable memory errors. Advanced ECC provides additional protection over Standard ECC in that
it is possible to correct certain memory errors that would otherwise be uncorrectable and result in a server failure.
Whereas standard ECC can correct single-bit memory errors, Advanced ECC can correct single-bit memory errors and multi-bit
memory errors if all failed bits are on the same DRAM device on the FBDIMM.
In addition to general configuration requirements, Advanced ECC memory also has the following configuration requirements:
FBDIMMs must be installed in pairs unless operating in single-FBDIMM mode. The server supports single-FBDIMM mode only in
QuickSpecs
HP ProLiant DL380 Generation 5
Memory
DA - 12477 Worldwide QuickSpecs — Version 1 — 6/26/2006 Page 31