HP ProLiant ML570 Generation 2 Server Memory Installation Guide

Memory
Hot-Plug Mirrored Memory Technology
This section details the features and DIMM installation requirements for hot-plug
mirrored memory.
Features
Hot-plug mirrored memory uses an additional memory board to provide complete
memory redundancy. Hot-plug mirrored memory has the following advantages:
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Hot-plug mirrored memory provides protection against uncorrectable errors. If a
DIMM on one memory board has an uncorrectable error, the system begins
reading from the other memory board instead.
Hot-plug mirrored memory enables hot-replace capabilities, which help minimize
server downtime.
Hot-plug mirrored memory can support up to 16 GB of system memory and
16 GB of redundant memory using 2-GB DIMMs.
IMPORTANT: If a DIMM exceeds the HP pre-defined limit for correctable errors, the system
fails over to the redundant banks.
To use hot-plug mirrored memory, you must install a second memory board. Both
memory boards must be configured identically. (DIMMs installed in corresponding
banks on each memory board must be of the same capacity.) If any DIMM has a
uncorrectable error, the system performs the following actions:
Rereads the correct data from the redundant memory board
Performs all future reads from the redundant memory board
Provides notification of the DIMM failure using the memory board LEDs, the
front-panel internal health LED, and Insight Manager 7
This process occurs without intervention or server interruption, and enables you to
hot-replace the failed or degraded DIMM at your convenience. Uncorrectable errors
are detected at the bank level rather than the DIMM level, so if an uncorrectable error
occurs, all DIMMs in the bank must be replaced.
HP ProLiant ML570 Generation 2 Server Memory Installation Guide 1-19
HP CONFIDENTIAL
Writer: Jennifer Hayward File Name: b-ch1 Memory.doc
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