On Failure Diagnosis of the Storage Stack

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" summary

A cross-layer diagnosis platform called X-ray combines a host agent that captures kernel and application events with a dev agent that intercepts device commands inside a VM without kernel mods or special hardware, aligns events using ndp timestamp sync, builds a correlation tree of system calls, kernel functions and device commands, and applies rule-based pruning to highlight suspects. Tested on five real failures it reduces the search space to under 5% of nodes on average and isolates root causes such as a misattributed kernel bug.

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" chapters (7)

1. 0:00Introduction
2. 0:25Existing efforts
3. 0:49Diagnosis tools
4. 1:23Real world example
5. 2:02Crosslayer approach
6. 3:09Challenges
7. 4:22Results