fc-sequence · shipping · also FC sequence

Fibre Channel sequence

A Fibre Channel sequence is one or more related data frames sent in one direction within an exchange.

Related Observatory article: Fibre Channel sequence on hesela.com

SEQ_ID distinguishes a sequence in the applicable exchange and port context; SEQ_CNT identifies frames within the sequence's counting rules. Sequence-ID reuse and uniqueness depend on negotiated conditions, so SEQ_ID alone is not a global trace key. [1]

Linux v6.12 represents SEQ_ID with 8 bits and SEQ_CNT with 16 bits. A frame counter's width is not a count of outstanding storage commands. [2]

Relations

related
Fibre Channel, Fibre Channel frame, Fibre Channel exchange

Citations

  1. FCIA: Inside a Modern Fibre Channel Architecture, Part 2 (2021), slides 7, 19, 23-31, 35 and 38 (accessed 2026-10-19)
  2. Linux v6.12: fc_fs.h frame layout, identifiers and protocol types (accessed 2026-10-19)
Sources & caveats
  • Source-backed protocol definition; no throughput, failure-rate or durability measurement is implied.

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Hesela team. Fibre Channel sequence. Hesela. 2026-10-19. https://hesela.dev/terms/fc-sequence/