Re-Architecting Ceph, One Crimson-OSD at a Time

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" summary

Crimson-OSD is a drop-in replacement for the classical OSD built on Seastar C++ that re-architects the IO path to single-thread-per-core shared-nothing execution, eliminating expensive locks, context switches and CPU migration. Perf and FIO runs show 4x random read IOPS and full 32-core utilization versus 24/32 for the classical OSD; random writes remain worse and an ongoing PR targets that. Implementation uses C++20 co_await coroutines, unified packaging, nightly CI, and new storebench/debug tooling.

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" chapters (9)

1. 0:00Introduction to Crimson
2. 2:36Architectural challenges
3. 5:47Handling trade-offs
4. 8:26Performance analysis
5. 11:46Performance results
6. 13:37Roadmap and progress
7. 17:16Future project goals
8. 19:27Development and conclusion
9. 22:20Q&A session