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. In some implementations, the metadata service runs inside an application server. The storage service manages a set of disks on which the user data is stored.
Answer D
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 (and can 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.
Information Storage and Management . Wiley. Kindle Edition
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