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| <h1>Storage Container Manager</h1> |
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| <p>Storage container manager provides multiple critical functions for the Ozone |
| cluster. SCM acts as the cluster manager, Certificate authority, Block |
| manager and the Replica manager.</p> |
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| Cluster Management |
| </h4> |
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| SCM is in charge of creating an Ozone cluster. When an SCM is booted up via <kbd>init</kbd> command, SCM creates the cluster identity and root certificates needed for the SCM certificate authority. SCM manages the life cycle of a data node in the cluster. |
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| Service Identity Management |
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| SCM's Ceritificate authority is in |
| charge of issuing identity certificates for each and every |
| service in the cluster. This certificate infrastructre makes |
| it easy to enable mTLS at network layer and also the block |
| token infrastructure depends on this certificate infrastructure. |
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| Block Management |
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| SCM is the block manager. SCM |
| allocates blocks and assigns them to data nodes. Clients |
| read and write these blocks directly. |
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| Replica Management |
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| SCM keeps track of all the block |
| replicas. If there is a loss of data node or a disk, SCM |
| detects it and instructs data nodes make copies of the |
| missing blocks to ensure high avialablity. |
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