Adaptec 412R User Guide - Page 126

DuraStor 412R/6320SS/7320SS Installation and User's Guide Understanding Mirrored Operations The mirroring feature causes configuration changes to be mirrored to the opposite controller in an active-active configuration. The mirrored configuration is stored in the other controller's firmware (Flash). If a controller fails and is replaced, then on boot up, it attempts to retrieve this configuration data from the opposite controller. The intent is that the user will not need to reconfigure a new controller when it is replaced. Note: Dual RAID controller operations require that both controllers must have the same version firmware installed. If a replacement controller uses its mirrored configuration, you will see it print a message during boot (saying it's using the mirrored configuration), and then it will reboot (rebooting is necessary for the mirrored configuration to take effect). Here's how the mirrored configuration works in different scenarios: I Stand-alone mode-The feature is not active. I Active-active mode where both controllers are operating normally - Each controller uses its own local configuration. I Active-active mode where one controller boots and the other controller does not boot due to some problem - The controller that boots uses its local configuration. I Active-active mode where one controller is up when a new replacement controller boots - the new controller attempts to get its mirrored configuration from the other controller. If it is not available, it will try to use its local configuration. If that is not available, then it will use the default settings. A-24