Memory configurations, Fbdimm installation guidelines – HP ProLiant BL680c G5 Server-Blade User Manual
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Hardware options installation 29
CAUTION:
Use only HP FBDIMMs. FBDIMMs from other sources may adversely affect data
integrity.
Memory configurations
The server blade supports the following AMP options to optimize server blade availability:
•
Advanced ECC supporting up to 64 GB of active memory using 4-GB FBDIMMs.
•
Online Spare Memory supporting up to 56 GB of active memory and 8 GB of online spare memory
using 4-GB FBDIMMs. Online Spare Memory provides additional protection against degrading
memory.
•
Mirrored memory supporting up to 32 GB of active memory and 32 GB of mirrored memory using
4-GB FBDIMMs. Mirrored memory provides protection against failed memory.
For the latest memory configuration information, see the QuickSpecs on the HP website
FBDIMM installation guidelines
The following configuration requirements apply to single-rank and dual-rank FBDIMMs:
•
FBDIMMs must be 667-MHz DDR2 FBDIMMs.
•
FBDIMMs must be installed in pairs.
•
FBDIMM pairs in the same memory bank must have identical HP part numbers.
•
FBDIMMs must be populated as shown in the following table for the designated AMP mode.
Multiple memory modes are supported, based on FBDIMM population and AMP mode selection. The
server blade defaults to Advanced ECC. If the FBDIMM population is modified after the memory mode is
selected in RBSU, and no longer supports the selected mode, the system defaults to Advanced ECC during
POST.
If the server blade contains more than 4 GB or more of memory, consult the operating system
documentation about accessing the full amount of installed memory.
Advanced ECC memory configuration
Advanced ECC memory is the default memory protection mode for this server blade. In Advanced ECC,
the server blade is protected against correctable memory errors. The server blade provides notification if
the level of correctable errors exceeds a pre-defined threshold rate. The server blade does not fail
because of correctable memory errors. Advanced ECC provides additional protection over Standard ECC
because it is possible to correct certain memory errors that would otherwise be uncorrectable and result in
a server blade 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.