Document the container A/B on the corrected single-pool rig (one 16-drive
EC:4 set, 2 MiB non-inlined objects):
- single-trip proven directly: with xl.meta and the canonical data dir
deleted on all drives, FAST_GET=1 still serves byte-exact from the shadow
(multi-pool returned 404).
- cold single-stream TTFB ~26% lower (server-side trace) / ~21% (curl),
captured paired on the same requests; saturated throughput flat on the
seek-free loopback medium.
- record the two rig traps (multi-pool xl.meta pre-read; inline cutoff is
per-shard, so EC:4 inlines everything below ~1.5 MiB).
Design note: the on-disk shadow header should be variable-length with a
self-describing payload so fields can evolve without lockstep; the fixed
1024-byte positional header is a phase-1 shortcut.
abuckit