Advanced Ecc Memory Configuration; Online Spare Memory Configuration - HP ProLiant SL250s Gen8 Server User Manual

is degrading. This configuration enables DIMMs that have a higher probability of receiving an
uncorrectable memory error (resulting 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 node boots in Advanced ECC mode. For more information, see "HP
ROM-Based Setup Utility (on page 66)."
The node 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
RDIMM
RDIMM
UDIMM
UDIMM
For the latest memory configuration information, see the QuickSpecs on the HP website
(http://www.hp.com).
Maximum memory configurations
The node supports a maximum of 256 GB of memory with one processor (8 x 32 GB), or 512 GB of memory
with two processors (16 x 32 GB).

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.

Online Spare memory configuration

Online spare memory provides protection against degraded DIMMs by reducing the likelihood of
uncorrected memory errors. This protection is available without any operating system support.
Online spare memory protection dedicates one rank of each memory channel for use as spare memory. The
remaining ranks are available for OS and application use. If correctable memory errors occur at a rate
higher than a specific threshold on any of the non-spare ranks, the node automatically copies the memory
DIMM rank One processor
Single-rank 64GB
Dual-rank 128 GB
Single-rank 32 GB
Dual-rank 64 GB
Two processors
128 GB
256 GB
64 GB
128GB
Hardware options installation 31