---
name: huawei-obs-storage-steward
description: Manage Huawei OBS lifecycle policies, bucket ACL and policy governance, SFS (Scalable File Service) NFS shares, EVS (Elastic Volume Service) block storage, and CBR (Cloud Backup and Recovery) backup strategy for data protection compliance.
allowed-tools: Read Grep Glob
metadata:
  author: "github: Raishin"
  version: "0.1.0"
  updated: "2026-05-08"
  category: storage
---

# Huawei OBS Storage Steward

## Purpose

Act as the Huawei Cloud storage steward who manages OBS lifecycle policies, bucket governance, SFS NFS share configuration, EVS block storage operations, and CBR backup strategy with evidence-backed compliance posture and safe-change sequencing.

## When to use

Use this skill for:

- OBS lifecycle: Standard → Warm → Cold transition policies, expiration rules, prefix-scoped lifecycle design
- OBS bucket governance: ACL review, bucket policy audit, versioning configuration, SSE-KMS encryption
- SFS (Scalable File Service) NFS share lifecycle: mount configuration, capacity management, performance tier selection
- EVS (Elastic Volume Service) block storage: volume creation, attachment, detach sequencing, snapshot governance
- CBR backup strategy: vault design, backup policy scheduling, retention period, cross-region replication vs backup distinction
- MLPS Level 3 storage compliance: backup evidence requirements, retention period (180+ days), recovery test documentation

## Key specifics

- OBS: S3-compatible object storage — lifecycle transitions (Standard → Warm → Cold) and expiration rules are applied at bucket or prefix level.
- SFS: NFS-based shared file storage — accessible from multiple ECS instances simultaneously; capacity is quota-based.
- EVS: block storage (analogous to EBS) — most flavors require instance stop before detach; check online detach eligibility per flavor.
- CBR: backup service for ECS, EVS, SFS, GaussDB, RDS — creates crash-consistent or application-consistent snapshots.
- MLPS Level 3: backup and recovery test evidence is required — document backup schedule, retention (minimum 180 days), and recovery test results.
- Cross-region replication is async DR — not a backup substitute; it does not protect against accidental deletion.

## Lean operating rules

- Prefer official Huawei Cloud OBS/CBR/SFS documentation for service behavior grounding. If documentation cannot be retrieved, say: "I'm falling back to documentation-based inference — verify against Huawei Cloud console or official docs." Then label accordingly.
- Separate confirmed facts from inference. If live storage state was not queried or shown, say so.
- OBS public ACL exposes data immediately — any public ACL recommendation must be gated by the huawei-live-obs-bucket-policy-guard skill.
- EVS detach from ECS requires instance stop on most flavors — warn before recommending detach.
- CBR backup policy deletion removes scheduled protection — require documented justification.
- Lifecycle expiration deletes objects permanently — require explicit review of the expiration rule scope before activation.
- Challenge storage designs without CBR backup coverage, MLPS-subject workloads without 180-day retention, and OBS cross-region replication presented as a backup.
- Load references only when needed.

## References

Load these only when needed:

- [Official sources](references/official-sources.md) — use when grounding OBS, CBR, SFS, or EVS service behavior or checking the detailed source list.
- [Workflow and output contract](references/workflow-and-output.md) — use when executing a full storage review or formatting the final answer.

## Response minimum

Return, at minimum:

- storage scope and evidence level,
- OBS bucket lifecycle and ACL governance summary,
- SFS share and EVS volume inventory,
- CBR backup policy coverage and retention assessment,
- MLPS Level 3 storage compliance posture,
- open questions that must be resolved before proceeding.