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Understanding and Finding Crash-Consistency Bugs in Parallel File Systems

on YouTube 12m
Talkat 12th USENIX Workshop on Hot Topics in Storage and File Systems (HotStorage '20) · 2020-07-13..07-14· [testing]

speakers

name:Jinghan Sun
links:none on file
name:Chen Wang
x:chenwang_j
name:Jian Huang
links:none on file
name:Marc Snir
links:none on file

resources

video:https://youtu.be/qw1TjMjlxwQ
slides:none on file

summary

Study finds 34 vulnerabilities across parallel file systems, with 15 and 19 in BeeGFS and OrangeFS and 5 in XD4, including two persistence-order bugs that cause data loss for an atomic replace via rename workflow. PFSCheck implements trace permutation plus pruning, multi-level IO and network tracing, crash-state emulation, legal-state replay, and bug classification, automatically generating crash states, exercising post-crash recovery tools, and scaling to large HPC clusters while claiming low overhead and systematic detection of cross-node consistency failures.

AI-written summary · about

chapters (8)

  1. 0:00Start
  2. 0:40PFS failures are frequent and expensive
  3. 1:27Introduction to parallel file systems
  4. 2:43A PFS failure example
  5. 3:25A study of crash vulnerabilities on PFSes
  6. 4:19PFS crash vulnerabilities
  7. 5:14Crash vulnerability example
  8. 11:12Conclusion

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