HP ML530 ProLiant ML530 Generation 2 Memory Installation Guide - Page 24

Memory Single-Board Mirrored Memory Technology This section details the features and DIMM installation requirements for single-board mirrored memory. Features Single-board mirrored memory uses mirrored banks to provide a high level of memory redundancy. Single-board mirrored memory has the following advantages: • Single-board mirrored memory provides protection against multi-bit errors. If a DIMM on the memory board has a multi-bit error, the system reads from the mirrored banks instead. • The server can support up to 8 GB of system memory and 8 GB of redundant memory using 2-GB DIMMs. IMPORTANT: DIMMs in the redundant banks must be configured identically to the banks they are mirroring. IMPORTANT: If a DIMM exceeds the HP predefined 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. In a server configured for single-board mirrored memory, bank C mirrors bank A, and, if populated, bank D mirrors bank B. If any DIMM in bank A or bank B has a multi-bit error, the system performs the following actions: 1. Rereads the correct data from the redundant memory banks 2. Performs all future reads from the redundant memory banks 3. Provides notification of the DIMM failure via 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 replace the degraded DIMM at your convenience during a regularly scheduled shutdown. Multi-bit errors are detected at the bank level rather than the DIMM level, so if a multi-bit error occurs, both DIMMs in the bank must be replaced. 1-14 HP ProLiant ML530 Generation 2 Server Memory Installation Guide