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Tvarak efficiently implements system-level redundancy for direct-access (DAX)NVM storage. Production storage systems complement device-level ECC (whichcovers media errors) with system-checksums and cross-device parity. Thissystem-level redundancy enables detection of and recovery from data corruptiondue to device firmware bugs (e.g., reading data from the wrong physicallocation). Direct access to NVM penalizes software-only implementations ofsystem-level redundancy, forcing a choice between lack of data protection orsignificant performance penalties. Offloading the update and verification ofsystem-level redundancy to Tvarak, a hardware controller co-located with thelast-level cache, enables efficient protection of data from such bugs in memorycontroller and NVM DIMM firmware. Simulation-based evaluation with sevendata-intensive applications shows Tvarak's performance and energy efficiency.For example, Tvarak reduces Redis set-only performance by only 3%, compared to50% reduction for a state-of-the-art software-only approach.

Tvarak: Software-managed hardware offload for DAX NVM storage redundancy