Odinfs is a NUMA-aware PM file system based on an opportunistic delegation framework to achieve datapath scalability. It limits concurrent PM access to avoid performance meltdown due to on-DIMM cache trashing. It localizes PM access to avoid performance meltdown due to remote PM access. It automatically parallelizes large PM access to utilize cumulative PM bandwidth across all NUMA nodes. It maximizes concurrent access within the same file with scalable synchronization primitives.