Rdimm Maximum Memory Configurations; Udimm Maximum Memory Configurations; Advanced Ecc Memory Configuration; Mirrored Memory Configuration - HP ProLiant BL490c - G6 Server User Manual

Advanced Memory Protection options are configured in RBSU. If the requested AMP mode is not
supported by the installed DIMM configuration, the server blade boots in Advanced ECC mode. For more
information, see "HP ROM-Based Setup Utility (on page 48)."
For the latest memory configuration information, see the QuickSpecs on the HP website
(http://www.hp.com).

RDIMM maximum memory configurations

The following table lists the maximum memory configuration possible with 8-GB RDIMMs.
Rank
Single-rank
Dual-rank
Quad-rank

UDIMM maximum memory configurations

The server blade supports a maximum of 12 GB with one processor and 24 GB with two processors using
2-GB single- or dual-rank UDIMMs.

Advanced ECC memory configuration

Advanced ECC memory is the default memory protection mode for this server blade. Standard ECC can
correct single-bit memory errors and detect multi-bit memory errors. When multi-bit errors are detected
using Standard ECC, the error is signaled to the server blade and causes the server blade to halt.
Advanced ECC protects the server blade against some multi-bit memory errors. Advanced ECC can
correct both single-bit memory errors and 4-bit memory errors if all failed bits are on the same DRAM
device on the DIMM.
Advanced ECC provides additional protection over Standard ECC because it is possible to correct certain
memory errors that would otherwise be uncorrected and result in a server blade failure. The server blade
provides notification that correctable error events have exceeded a pre-defined threshold rate.

Mirrored memory configuration

Mirroring provides protection against uncorrected memory errors that would otherwise result in server
blade downtime. Mirroring is performed at the channel level. Channels 1 and 2 are used; channel 3 is
not populated.
Data is written to both memory channels. Data is read from one of the two memory channels. If an
uncorrectable error is detected in the active memory channel, data is retrieved from the mirror channel.
This channel becomes the new active channel, and the system disables the channel with the failed DIMM.

Lockstep memory configuration

Lockstep mode provides protection against multi-bit memory errors that occur on the same DRAM device.
Lockstep mode can correct any single DRAM device failure on x4 and x8 DIMM types. The DIMMs in
each channel must have identical HP part numbers.
Single-processor
72 GB
72 GB
48 GB
Dual-processor
144 GB
144 GB
96 GB
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