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Primary storage systems that compress data in real time, use some form of on disk metadata to perform the virtualization needed in storing compressed data. Usually this metadata is in the form of B-trees (eventually compressed) and stored on disk. For random accesses to compressed data, where the metadata is not in cache, this additional layer significantly slows down random reads and writes. Our...
Deduplication is a commonly-used technique on disk-based storage pools. However, deduplication has not been used for tape-based pools: tape characteristics, such as high mount and seek times combined with data fragmentation resulting from deduplication create a toxic combination that leads to unacceptably high retrieval times. This work proposes DedupT, a system that efficiently supports deduplication...
Modern primary storage systems support or intend to add support for real time compression usually based on some flavor of the LZ77 and/or Huffman algorithm. There is a fundamental tradeoff in adding real time (adaptive) compression to such a system: to get good compression the amount of compressed data (the independently compressed block) should be large, to be able to read quickly from random places...
Cloud-based backup and archival services use large tape libraries as a cost-effective cold tier in their online storage hierarchy today. These services leverage deduplication to reduce the disk storage capacity required by their customer data sets, but they usually re-duplicate the data when moving it from disk to tape.
Many new storage systems provide some form of data reduction. In a recent paper we investigate how compression and de-duplication can be mixed in primary storage systems serving active data. In this paper we try to answer the question someone would ask before upgrading to a new, data reduction enabled storage server: how much storage savings the new system would offer for the data I have stored right...
Many new storage systems provide some form of data reduction. We examine data reduction methods that might be suitable for \emph{primary} storage systems serving active data (as contrasted with backup and archive systems), by analysis of file sets found in different active data environments. We address questions of: how effective are compression and variations of deduplication, both separately and...
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