An Object-based Storage Device (OSD) is a computer storage device, similar to disk storage but working at a higher level. Instead of providing a block-oriented interface that reads and writes fixed sized blocks of data, an OSD organizes data into flexible-sized data containers, called objects. Each object has both data (an uninterpreted sequence of bytes) and metadata (an extensible set of attributes describing the object).
Reference:
[1] http://en.wikipedia.org/wiki/Object_storage_device
[2] http://lab.howie.tw/2013/04/
[3] https://researchweb.watson.ibm.com/haifa/projects/storage/objectstore/papers/PositionOSD.pdf
[4] http://www.ascc.sinica.edu.tw/sysinfo/storage/conference/object-sun.pdf
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