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연속적인 데이터 보호 시스템에서 점진적인 데이터 복원 방법
문정주(Jungjoo Moon),송석일(Seokil Song) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.5
CDP (Continuous Data Protection) is a data protection method which does not have any limitation in RPO and RTO. However, it keeps track of all changes in the data for this purpose, so the work load for CDP on the system is higher than others. Consequently, a number of methods have been proposed to reduce the problem, but there is still room for improvement for recovery. In this paper, we propose an efficient data recovery method for CDP. The proposed recovery method provides incremental data recovery based on an existing file system level CDP method. The incremental data recovery method ensures instant access to the data requested by the user. In addition, the proposed recovery method provides transparency to the user, i.e. allowing the user to recognize the recovery data as files or directories on the local storage. Finally, in this paper, we implement the proposed recovery method and verify its performance through various experiments. In addition, we demonstrate the merits of the proposed method by performing a qualitative comparison with the commercial CDP products.