Practical Monitoring Tool for ZNS SSD Emulator

초록

Zoned Namespace (ZNS) SSDs expose internal zone structures to improve performance and endurance, making them attractive for data-intensive workloads in cloud, edge, and fog computing environments. However, evaluating zone placement policies remains difficult due to limited runtime visibility into internal resource utilization. We develop femonitor, a lightweight, real-time monitoring tool for FEMU-based ZNS emulators that collects per-channel and per-plane statistics via vendor-specific NVMe admin commands. femonitor enables fine-grained observation of internal SSD behavior, which is particularly useful for evaluating or debugging storage management strategies. Using femonitor, we demonstrate that various zone placement policies allocate internal resources as intended. Our results show that femonitor introduces negligible overhead (below 0.5%), even with a 1ms polling interval, making it suitable for continuous runtime monitoring of ZNS-based storage systems.

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