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| <!--- |
| Licensed to the Apache Software Foundation (ASF) under one or more |
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| <p>SCM 为 Ozone 集群提供了多种重要功能,包括:集群管理、证书管理、块管理和副本管理等。</p> |
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| 集群管理 |
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| SCM 负责创建一个 Ozone 集群,当通过 <kbd>init</kbd> 命令启动 SCM 时,SCM 会创建集群标识以及用于担任 CA 的根证书,SCM 负责集群中数据节点生命周期管理。 |
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| 服务身份管理 |
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| SCM 的 CA 负责向集群中的每个服务颁发身份证书,证书设施方便了网络层 mTLS 协议的启用,也为块 token 机制提供了支持。 |
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| 块管理 |
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| SCM 管理 Ozone 中的块,它将块分配给数据节点,用户直接读写这些块。 |
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| 副本管理 |
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| SCM 会跟踪所有块副本的状态,如果检测到数据节点宕机或磁盘异常,SCM 命令其它节点生成丢失块的新副本,以此保证高可用。 |
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