Simulating the Effect of Preservation Actions on Repository Evolution

C. Weihs, A. Rauber:
"Simulating the Effect of Preservation Actions on Repository Evolution";
in:"Proceedings of the 8th International Conference on Preservation of Digital Objects", herausgegeben von: National Library Board Singapore; Nanyang Technical University Singapore, Singapore, 2011, ISBN: 978-981-07-0441-4, S. 62 - 69.

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One of the most important challenges in planning and main-
taining a digital repository is to predict the needed resources
on a long term basis, especially storage size and processing
power. The main problem emerges from the need to mi-
grate the data at certain times to newer le types, which
takes time and alters the needed storage space, potentially
branching into several migration paths for individual ob-
jects. Understanding the e ect of di erent policy decisions,
such as when to migrate or whether to stay within a format
family or branching into several format families turns into
a complex task, speci cally when considering non-trivial in-
gest structures and assumptions on format evaluations. In
this paper we present ReproSim, a framework that simulates
the evolution of a digital repository and helps predicting
these factors. We demonstrate the complexity and power of
simulation to assist in preservation decisions in a set of sce-
narios involving di erent ingest and preservation planning
pro les.