红帽全球峰会3.2. Metro-DR 不支持的功能
使用 Metro-DR 时不支持与外部模式相关的以下功能：
- 使用非默认 RADOS 命名空间的 StorageClasses
- 用户创建 StorageClasses，即使使用默认的 RADOS 命名空间
- 多个 StorageClasses
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