Online Spare Memory Technology - HP ML570 - ProLiant - G2 Installation Manual

Online Spare Memory Technology

This section details the features and DIMM installation requirements for online spare
memory.
Features
Online spare memory uses an online spare bank to provide additional memory
protection. Online spare memory has the following advantages:
•
Online spare memory provides DIMM failover capabilities for single-bit
correctable errors. Bank D on memory board 1 is configured as an online spare
bank. If a DIMM on either memory board exceeds the pre-defined limit for
single-bit correctable errors, indicating that it may fail, the system fails over to
the online spare bank.
•
If one memory board is installed, the ProLiant ML500 series Generation 2
servers support up to 12 GB of system memory and 4 GB of online spare
memory using 2-GB DIMMs.
•
If two memory boards are installed, the ProLiant ML500 series Generation 2
servers support up to 28 GB of system memory and 4 GB of online spare
memory using 2-GB DIMMs.
IMPORTANT: DIMMs in the online spare bank must be of equal or greater capacity than the
DIMMs in the remaining banks.
Online spare memory can be configured with either one or two memory boards.
Bank D on the memory board in slot 1 is the online spare bank, even if two memory
boards are installed. The online spare bank can provide memory protection for up to
seven other banks: three banks on the memory board in slot 1 and four banks on the
memory board in slot 2. If any DIMM in these seven banks exceeds the pre-defined
limit for single-bit correctable errors, indicating that it may fail, the system performs
the following actions:
•
Copies the contents of the degraded bank to the online spare bank
•
Deactivates the failing bank
•
Activates the online spare bank
HP ProLiant ML500 Series Generation 2 Server Memory Installation Guide
Memory
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