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Evolvable and scalable system of content servers for a large digital preservation archives

机译：用于大型数字保存档案的内容服务器的可扩展和可扩展系统

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Building a large-scale digital preservation archives system (LDPAS) for long-term access is a challenging endeavor. The three most significant system requirements contributing to that challenge are the scalability of the system, accommodation of heterogeneous digital holdings, and the evolvability of both the constituting technologies and the data formats in storage. The amount of digital-born materials requiring long-term preservation and access is overwhelming due to the fast pace of information technology and its widespread utilization in government, business corporations, academic institutions, and the general public. Compounding to the data volume challenge is the heterogeneity of the data, which range from the products of office automation and geospatial images, to multimedia artifacts. Storing and preserving digital objects must be accomplished in a way that allows access to the objects independently of the platform technology and software applications used to create these objects. As the technologies change rapidly, the LDPAS must accommodate the changes to its benefit, while also increasing in scale. A successful LDPAS must be able to adapt to the two-fold evolutionary demands. The evolution of the system software with time is the norm in any large-scale long-term system. But, even more important is the system's capability to cope with the evolution of the very software applications that generated the digital objects archived within it. In this paper, we propose an architecture of a system of Content Servers, which can scale with the data volume growth, continually sustain evolution in the face of technological change, and provide different levels of service to the different kinds of users accessing the LDPAS. We describe the concept, components and services of a Content Server in the context of digital archiving, service-oriented architecture (SOA) and the Open Archive Information System (OAIS) reference model. Several possible deployment configurations a--re shown to illustrate the efficient utilization of low level services and the flexibility of the system to scale up or down.
机译：建立大型数字保存档案系统（LDPAS）以进行长期访问是一项艰巨的任务。促成这一挑战的三个最重要的系统要求是系统的可伸缩性，异构数字资产的容纳以及构成技术和存储中数据格式的可演化性。由于信息技术的飞速发展及其在政府，商业公司，学术机构和公众中的广泛应用，需要长期保存和访问的数字化出生的材料数量激增。数据的异质性加剧了数据量的挑战，其范围从办公自动化和地理空间图像的产品到多媒体工件。必须以允许独立于用于创建这些对象的平台技术和软件应用程序访问对象的方式来完成数字对象的存储和保存。随着技术的快速变化，LDPAS必须适应其利益的变化，同时还要扩大规模。成功的LDPAS必须能够适应两方面的发展需求。系统软件随时间的发展是任何大型长期系统中的常态。但是，更重要的是该系统能够处理生成其中存储的数字对象的软件应用程序的发展。在本文中，我们提出了一种内容服务器系统的体系结构，该体系结构可以随着数据量的增长而扩展，在技术变革面前不断保持发展，并为访问LDPAS的不同类型的用户提供不同级别的服务。我们将在数字归档，面向服务的体系结构（SOA）和开放档案信息系统（OAIS）参考模型的上下文中描述Content Server的概念，组件和服务。几种可能的部署配置 -- 重新显示以说明低级别服务的有效利用以及系统按比例放大或缩小的灵活性。

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