ECStore Layout Boundary

This document records the E-001 and E-SET-001 foundation slice for the architecture migration.

Directory Skeleton

The ECStore migration uses these internal ownership buckets before any pure file moves:

api: facade and compatibility re-export ownership.
core: store facade, object, bucket, list, multipart, and heal paths.
layout: static endpoint, disk, pool, and set layout descriptions.
disk: local disk, format, health, and disk error ownership.
erasure: erasure coding and bitrot ownership.
metadata: bucket metadata, config object-store, and data-usage ownership.
cluster: remote disk, peer, lock, membership, and health-control-plane ownership.
services: lifecycle, replication, tier, notification, rebalance, and metrics service ownership.

Static Set Layout

Static layout is derived from persisted FormatV3 data and input endpoint expansion. It may describe:

deployment id;
set count and drives per set;
disk UUID positions inside format.erasure.sets;
distribution algorithm;
endpoint grouping produced before runtime disk initialization.

Static layout must not own disk handles, lock clients, reconnect loops, repair state, or shutdown signaling.

Format And Disk Layout Ownership

layout::format owns persisted format structures and disk UUID position lookup. layout::disks_layout owns command-line volume expansion into pool/set layout.

Compatibility paths remain available through disk::format and disks_layout until downstream callers are moved or compatibility coverage allows removal.

Runtime Set Orchestration

Runtime orchestration remains owned by Sets and SetDisks until a later pure move. It may describe:

flat disk index to (set_index, disk_index) mapping;
per-set local disk replacement after distributed setup detection;
per-set lock-client host deduplication;
endpoint reconnect monitoring and runtime shutdown signaling;
read/write/heal/list orchestration over initialized disks.

Preservation Rules

Object-to-set hashing and distribution algorithm selection must not change.
Format sets ordering and disk UUID position lookup must not change.
Local disk replacement and lock-client mapping stay runtime-only.
Later file moves must keep old public paths or add explicit compatibility coverage before deleting them.

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