[All Linux Operating Systems] Non-optimized access (NOA) events may be logged on the Oracle FS System system for up to ten minutes after a Controller failover and failback, after all paths to a Controller fail and subsequently recover, or after a new LUN is mapped to the host.
After a Controller failover and failback or a new LUN is mapped to the host, it can take some time for Linux to recover all paths and bring them back into use. During this period the host may continue to access the LUNs through paths which did not fail. This may cause short bursts of NOA to some LUNs. Once Linux brings the paths fully back into use, the host will synchronize again with the Controller on the best paths to use, and NOA events will no longer be logged.