HP ProLiant SL210t Gen8 Server - Manual (Page 39)

Hardware options installation 39
Advanced ECC memory configuration
Advanced ECC memory is the default memory protection mode for this node. 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 node and causes the node to halt.
Advanced ECC protects the node 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 node failure. Using HP Advanced
Memory Error Detection technology, the node provides notification when a DIMM is degrading and has a
higher probability of uncorrectable memory error.
Mirrored memory configuration
Mirroring provides protection against uncorrected memory errors that would otherwise result in node
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 mode
Lockstep memory mode provides protection against multibit memory errors that occur on the same DRAM
device. Lockstep memory 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.
Lockstep memory mode uses channel 2 and channel 3. Channel 1 is not populated. Because channel 1
cannot be populated when using Lockstep memory mode, the maximum memory capacity is lower than
Advanced ECC mode. Memory performance with Advanced ECC is also slightly higher.
Maximum capacity
Type Rank Single processor Dual processors
RDIMM Single 64 GB 128 GB
RDIMM Dual 128 GB 256 GB
UDIMM Single 32 GB 64 GB
UDIMM
Dual 64 GB 128 GB
Memory population guidelines
General DIMM slot population guidelines
Observe the following guidelines for all AMP modes:
• Install DIMMs only if the corresponding processor is installed.
• When two processors are installed, balance the DIMMs across the two processors.
• White DIMM slots denote the first slot of a channel (Ch 1-A, Ch 2-B, Ch 3-C, Ch 4-D)
• Do not mix RDIMMs, UDIMMs, or LRDIMMs.