Expand description
2026-09-25: RdmaTier: fetches expert records from an expert peer
(expert_peer) straight into the pinned arena and returns residency
addresses inside it, as UmaArenaTier does from local files. Transports:
TCP, where the peer reads each record and sends it, and one-sided RDMA
READ from the peer’s registered store (cfg(metrale_rdma_verbs) only).
Verbs rail 0 comes from METRALE_EXPERT_RDMA_DEV / METRALE_EXPERT_RDMA_GID;
METRALE_EXPERT_DUAL_RAIL=1 adds rail 1 from METRALE_EXPERT_RAIL2_DEV /
METRALE_EXPERT_RAIL2_GID.
Owner: metrale-storage experts. Invariants:
- A fetched record passes
residency_from’s identity check before its addresses are returned. - The rails’ registrations of the arena are dropped before the arena.