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On the basis of deep research on dependability of computer system, we extend the notion of dependability attribute, which is the dependability analysis object of traditional dependability theory, and present the multidimensional dependability object. We put forward a scientific and practical goal-based dependability analysis and improvement framework for computer systems. Aiming at the characteristics of network storage systems, we devise a reusable database for dependability analysis and improvement. According to the framework and the reusable database, a user can be directed and elicited to perform the analysis and improvement towards a network storage system.