Description

Understanding SPDK's RAID5F module at the code level. By tracing the I/O path, dissecting parity-generation logic, and studying how RAID5F organizes data and parity across stripes, we might be able to build a solid foundation for upcoming Longhorn sharding work. Many concepts—data distribution, stripe/chunk mapping, partial-write handling, and rebuild logic—parallel what Longhorn will need. Gaining clarity here will help ensure future Longhorn designs align well with proven SPDK patterns.

Goals

• Full end-to-end call-chain trace of RAID5F I/O and rebuild flows.
• Understand stripe mathematics: data/parity layout, parity calculation, and reconstruction logic.

Resources

• https://github.com/spdk/spdk