General dimm slot population guidelines, Advanced ecc memory configuration – HP ProLiant ML350e Gen8 v2-Server User Manual
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Hardware options installation 49
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Online spare memory—Provides protection against failing or degraded DIMMs. Certain memory is
reserved as spare, and automatic failover to spare memory occurs when the system detects a DIMM that
is degrading. This feature enables DIMMs that have a higher probability of receiving an uncorrectable
memory error (which would result in system downtime) to be removed from operation.
Advanced Memory Protection options are configured in RBSU. If the requested AMP mode is not supported
by the installed DIMM configuration, the server boots in Advanced ECC mode. For more information, see
"HP ROM-Based Setup Utility (on page
)."
The server also can operate in independent channel mode or combined channel mode (lockstep). When
running in lockstep mode, you gain reliability in one of two ways:
•
If running with UDIMMs (built with x8 DRAM devices), the system can survive a complete DRAM failure
(SDDC). In independent channel mode, this failure would be an uncorrectable error.
•
If running with RDIMM (built with x4 DRAM devices), the system can survive the complete failure of two
DRAM devices (DDDC). Running in independent mode, the server can only survive the complete failure
of a single DRAM device (SDDC).
Maximum capacity
DIMM type
DIMM rank
One processor
Two processors
RDIMM
Single-rank
48 GB
96 GB
RDIMM
Dual-rank
96 GB
192 GB
UDIMM
Single-rank
24 GB
48 GB
UDIMM
Dual-rank
48 GB
96 GB
For the latest memory configuration information, see the QuickSpecs on the HP website
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).
•
Do not mix UDIMMs or RDIMMs.
•
When two processors are installed, install the DIMMs in sequential alphabetical order balanced
between the two processors: P1-A, P2-A, P1-B, P2-B, P1-C, P2-C, and so on.
For detailed memory configuration rules and guidelines, use the Online DDR3 Memory Configuration Tool
on the HP website
Advanced ECC memory configuration
Advanced ECC memory is the default memory protection mode for this server. 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 and causes the server to halt.
Advanced ECC protects the server 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.