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fix: reject unsupported pool expansion with actionable errors (#7360)

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* fix: reject unsupported pool expansion with actionable errors

Report singleton-pool and persisted-topology constraints before misleading startup retries. Preserve single-node multi-drive admission and existing parity policies, and cover format preservation plus operator recovery guidance for issue #6186.

* fix: keep pool layout errors typed

Preserve actionable pool layout diagnostics without adding generic formatted errors. Tighten the shrink-only baseline and assert that both typed payloads survive the I/O boundary.

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Co-authored-by: houseme <housemecn@gmail.com>
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cxymds
2026-09-07 19:07:42 +08:00
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README.md
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@@ -109,6 +109,15 @@ Star RustFS on GitHub and be instantly notified of new releases.
## Quickstart
> [!IMPORTANT]
> **Pool expansion notice:**
>
> - A single-node single-drive (SNSD) deployment is supported only as a standalone local path. It cannot expand in place or be added as a Pool. To move to a multi-drive topology, create a new deployment and migrate data through S3.
> - Keep an existing multi-drive Pool's endpoints and Erasure Set width unchanged; expand by appending a new Pool. With ellipsis-based expansion, every Pool argument must contain an ellipsis expression and expand to at least two drive endpoints.
> - Single-node multi-drive Pools and multi-node Pools with one drive per node are allowed, subject to valid Erasure Set geometry and EC settings; acceptance does not guarantee host-failure tolerance.
>
> These topology rules follow MinIO, but automatic parity selection differs between the projects. See the [Pool layout compatibility and regression tests](docs/testing/pool-layout-compatibility.md) before expanding a deployment.
To get started with RustFS, follow these steps:
### 1. One-click Installation (Option 1)