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CachingStorage systems have always attempted to use properties of the files that are stored in the system to optimize access time, capacity, and/or cost.Compression exploits patterns within files, and file migration and file caching exploit file access patterns, but the combination of these concepts has not been reported on before.We discuss here the effectiveness of a filesystem that integrates caching and compression to provide two levels of file storage on disks.This investigation is based on measurements that were collected on nine computers at three different sites.Tfie data indicate that automatic compression of least recently used files doubles the amount of data that can be stored on a given disk system, while incurring only a slight performance cost.
Cate et al. (Tue,) studied this question.
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