What is a role of the metadata service in object-based storage?

Question

Exhibit

Options

• AStores both objects and object IDs
• BMaps object IDs to the file system namespace
• CManages a set of disks on which the user data is stored
• DStores data in the form of objects

• A
  3% (1)
• B
  74% (23)
• C
  16% (5)
• D
  6% (2)

Explanation

Key components of Object-based Storage Device The OSD system is typically composed of three key components: nodes, private network, and The OSD system is composed of one or more nodes. A node is a server that runs the OSD operating environment and provides services to store, retrieve, and manage data in the system. The OSD node has two key services: metadata service and storage service. The metadata service is responsible for generating the object ID from the contents (may also include other attributes of data) of a file. It also maintains the mapping of the object IDs and the file system namespace. The storage service manages a set of disks on which the user data is stored. The OSD nodes connect to the storage via an internal network. The internal network provides node- to-node connectivity and node-to-storage connectivity. The application server accesses the node to store and retrieve data over an external network. In some implementations, such as CAS, the metadata service might reside on the application server or on a separate server. OSD typically uses low-cost and high-density disk drives to store the objects. As more capacity is required, more disk drives can be added to the system

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