Ceph paper note

Three main components:

• clients, expose near-POSIX file system interface to host or process
• cluster of OSDs, store data and metadata
• metadata server cluster, manage the namespace

Ceph address the scalability issue through three features:

• Decoupled data and Metadata

  Metadata operations are managed by a metadata server while clients interact directly with OSDs to perform file I/O.

• Dynamicl distributed metadata management

  Cluster architecture based on Dynamic Subtree Partitioning. Manage file system directory hierarchy among tens or even hundreds of MDSs.

• Reliable autonomic distributed object storage.

  Design for device failures are frequent and expected.