New encrypted writes store a keyed HMAC fingerprint as the object ETag (docs/operations/encrypted-etags.md). Replication forwards that ETag on x-rustfs-source-etag, but a target that computes its own ETag (AWS S3 and most compatible stores) answers the plaintext PUT with the MD5 of what it received. Both values are 32 hex characters, so verify_single_part_replica treated the fingerprint as a comparable MD5 and failed every single-part SSE-S3 / SSE-KMS replica with "replica etag mismatch"; MRF and resync then retried the object forever. RustFS and MinIO targets adopt the source ETag and were unaffected. Exempt sources whose stored ETag cannot describe the wire bytes: any managed-SSE or SSE-C source, decided by the existing replication source-encryption classifier. The checksum header on the replication PUT remains the integrity check for those objects; plaintext sources keep the audit unchanged. Claude-Session: https://claude.ai/code/session_01CezCdjE9AdShFUi9tNk797 Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
Documentation
Use the focused indexes rather than treating this directory as an unordered collection:
Operations
- Table maintenance periodic queueing — opt-in scheduling, limits, worker handoff, and recovery.
For PUT cleanup admission, blocking-pool isolation, and optional CPU affinity, see PUT cleanup isolation.
-
External certificate issuance and TLS rotation — publication, native reload, trust separation and failure handling.
-
Architecture guard troubleshooting — diagnose repository guard failures.
-
Logging governance — broad event audits, migrations, and guardrail changes.
-
Multipart upload memory diagnosis — allocator attribution, Docker reproduction and sustained upload checks.
For the logical per-operation io_uring read cap, see io_uring read chunk size.
For bounded local read-backend startup and cancellation, see io_uring backend initialization.
For legacy protection assessment and bounded protected copies, see Object integrity inventory, audit, and migration.
For encrypted listing compatibility and older stored fingerprints, see Encrypted object ETags.
Operational runbooks live under operations/. Replication
operators should start with:
| Runbook | Use it for |
|---|---|
| Site replication operations | Health fields, pending operations, outage recovery, re-pair admission, IAM/SSE boundaries, and upgrades. |
| Replication target check | Validating an S3 destination and version fidelity before enabling replication. |
| Replication object size limits | Multipart routing, large-object limits, and retry characteristics. |
| Replication outbound transport | Integrity headers, generic target behavior, and transport knobs. |
For the erasure-coded cluster lifecycle (planning, parity and EC:0,
expansion, rebalance, decommission, heal, drive replacement, restart
recovery, and the rc CLI mapping), start with
Cluster and erasure-coding lifecycle operations.
For concurrent bucket creation and deletion, see Bucket operation admission.
For persisted administrator bucket tasks and bucket recreation, see Bucket heal recovery.
For interrupted object deletions and returning drives, see Delete transaction recovery.
For disk replacement across VM restarts and schema 5/6 maintenance migration, see Replacement generation recovery.
For historical GET timeouts during PUT or Heal, see Object lock contention diagnostics.
Other runbooks remain grouped by filename in operations/;
architecture pages link to the relevant runbook where a cross-boundary
procedure is required.
For storage dashboards, see Storage metrics and observer selection: drive ownership, snapshot freshness, counter queries, and rolling upgrades.
For per-bucket capacity and object counts, see Bucket usage metrics: OTLP export, cluster deduplication, accounting semantics, and scanner freshness.
For optional shard commitments, see Independent shard integrity rollout: activation, legacy repair results, multipart mode changes, and rollback limits.
For crates.io publication of workspace crates, see Workspace Cargo Publish: dependency ordering, dry-run, publish, and failure handling.