HP ProLiant ML500 Series Generation 2 Server Memory Installation Guide

Memory
HP ProLiant ML500 Series Generation 2 Server Memory Installation Guide 1-19
HP CONFIDENTIAL
Writer: Jim Yurick File Name: b-ch1 Memory.doc
Codename: Time Bandit Part Number: 279987-002 Last Saved On: 8/23/02 1:07 PM
Hot-Plug Mirrored Memory Technology
This section details the features and DIMM installation requirements for hot-plug
mirrored memory.
Features
NOTE: Hot-plug mirrored memory mode is not available on ProLiant ML530 generation 2
servers.
Hot-plug mirrored memory uses an additional memory board to provide complete
memory redundancy. Hot-plug mirrored memory has the following advantages:
• Hot-plug mirrored memory provides protection against multi-bit errors. If a
DIMM on one memory board has a multi-bit 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 single-bit correctable errors, the
system does not fail over to the redundant banks, but does notify you of the condition through
Insight Manager 7, the memory board LEDs, and the front-panel internal health LED.
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
multi-bit 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 via the memory board LEDs, the
front-panel internal health LED, and Insight Manager 7