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2.2.3 Memory Mirror Mode Considerations


2.2.3 Memory Mirror Mode Considerations
Memory mirror mode is a function that duplicates memory to ensure the hardware reliability of memory. You can enable memory mirror mode to continue operation of a physical partition even if some part of memory fails, as long as recovery from the failure is possible. When physical partition dynamic reconfiguration is used, enabling memory mirror mode does not limit the function of physical partition dynamic reconfiguration.

However, you have to be careful about the configuration and operation of a physical partition. For example, if you perform an operation on a system board (PSB<BB>) with memory mirror mode enabled in dynamic reconfiguration, when deleting the PSB (BB), the memory resources used by Oracle VM Server for SPARC and Oracle Solaris will be moved to a different PSB (BB). At this time, if memory mirror mode is disabled for the destination PSB (BB), the memory resources used by Oracle VM Server for SPARC and Oracle Solaris are moved properly, but operation will continue with decreased memory reliability as a result. Set memory mirror mode by considering requirements for the domain configuration, operation, etc. and developing a plan in advance.

For details on memory mirroring settings, see "Chapter 14 Configuring a Highly Reliable System" in the Fujitsu SPARC M12 and Fujitsu M10/SPARC M10 System Operation and Administration Guide.