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PDS is a novel storage architecture that has built-in support for long-term digital preservation based on OAIS. In contrast with traditional block or file storage, and even with traditional archival systems, PDS "materializes" the logical concept of a preservation information object, namely the OAIS AIP, into a physical storage object. PDS is composed of a layered architecture based on open standards, along with the OAIS, XAM and OSD standards, and complies with the general design principle of preservation systems that employ open standards wherever possible.
The figure below depicts the general architecture of PDS. The top layer is an OAIS-based preservation engine, which provides preservation functionality for heterogeneous data and applications. It includes efficient generation and placement of AIPs along with support for migration and data transformations performed within the storage. The second layer includes an eXtensible Access Method (XAM) library. XAM is a SNIA emerging storage standard intended for reference information that provides a logical abstraction for data containers. The bottom layer includes an Object-based Storage Device (OSD), an advanced type of storage implementing an object-based interface that has a built-in access control mechanism.
Preservation DataStores Architecture
This is an extension of the OSD (Object Storage Device) paradigm and standard previously developed by IBM Haifa researchers.
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