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- W2000753599 abstract "Tracking archival usage and data migration in a long term supercomputing system is critical to understanding not only how users' needs and habits have changed over time, but also how the archive itself evolves in response to these external factors. Yet this type of study has not previously been performed. To address this need, we conducted an in-depth comparison of user initiated file activity on the mass storage system (MSS) at the National Center for Atmospheric Research (NCAR) during two periods, one in the early 1990s, and another nearly twenty years later. In addition to confirming earlier findings, our analysis turned up three surprising results. First, the read: write ratio went from 2:1 in the earlier trace to 1:2 in the later trace, a reduction of a factor of four in reads relative to writes. Second, only 30% of the current archive was accessed during the three year period of the study, in stark contrast to the 80% seen in the 1992 trace analysis. Third, access latency to the first byte of data actually got slower despite much faster computers and storage devices. These findings indicate that archival behavior has shifted towards a write-heavy workload, and that future archives can be more optimized for write activity than previously believed. Furthermore it may be worth considering the value of data being archived when it is stored, since later retrieval is increasingly less likely." @default.
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- W2000753599 date "2012-08-01" @default.
- W2000753599 modified "2023-09-24" @default.
- W2000753599 title "Evolutionary Trends in a Supercomputing Tertiary Storage Environment" @default.
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- W2000753599 doi "https://doi.org/10.1109/mascots.2012.53" @default.
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