Proceedings of the Twenty-Fourth ACM Symposium on Operating Systems Principles
ACM SIGOPS 24th Symposium on Operating Systems Principles
VirtuOS: an operating system with kernel virtualization
Proceedings of the Twenty-Fourth ACM Symposium on Operating Systems Principles
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This work augments MINIX 3's failure-resilience mechanisms with novel disk-driver recovery strategies and guaranteed file-system data integrity. We propose a flexible filter-driver framework that operates transparently to both the file system and the disk driver and enforces different protection strategies. The filter uses checksumming and mirroring in order to achieve end-to-end integrity and provide hard guarantees for detection of silent data corruption and recovery of lost data. In addition, the filter uses semantic information about the driver's working in order to verify correct operation and proactively replace the driver if an anomaly is detected. We evaluated our design through a series of experiments on a prototype implementation: application-level benchmarks show modest performance overhead of 0--28% and software-implemented fault-injection (SWIFI) testing demonstrates the filter's ability to detect and transparently recover from both data-integrity problems and driver-protocol violations.