Exploration of cache behavior using HPSS per-file transfer logs

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We assembled 18 months of transfer logs from a production High Performance Storage System (HPSS) system at the National Energy Research Scientific Computing Center(NERSC) and analyzed them to assess workload behavior and gain some insight into which cache configurations would provide the best service to the users. We found, as expected, that the workload is distributed over file size with a declining number of files as the files get larger, so the amount of space consumed per file size increment is roughly constant up to file sizes of 1 GB. Sixty one percent of file accesses were write accesses. There ... continued below

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Holmes, Harvard November 10, 2001.

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Description

We assembled 18 months of transfer logs from a production High Performance Storage System (HPSS) system at the National Energy Research Scientific Computing Center(NERSC) and analyzed them to assess workload behavior and gain some insight into which cache configurations would provide the best service to the users. We found, as expected, that the workload is distributed over file size with a declining number of files as the files get larger, so the amount of space consumed per file size increment is roughly constant up to file sizes of 1 GB. Sixty one percent of file accesses were write accesses. There are a significant number of files written which are never read -- backup files and similar files. For all sizes of files, access frequencies decline with the age of the files. HPSS uses the cache as an I/O buffer for incoming data. At our installation the cache behavior is dominated by the write traffic. Cache lifetimes tend to scale linearly with the size of the cache and inversely with the amount of data flow.

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OSTI as DE00793764

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  • Other Information: PBD: 10 Nov 2001

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  • Report No.: LBNL--49330
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/793764 | External Link
  • Office of Scientific & Technical Information Report Number: 793764
  • Archival Resource Key: ark:/67531/metadc741066

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  • November 10, 2001

Added to The UNT Digital Library

  • Oct. 19, 2015, 7:39 p.m.

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  • April 4, 2016, 6:37 p.m.

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Holmes, Harvard. Exploration of cache behavior using HPSS per-file transfer logs, report, November 10, 2001; California. (digital.library.unt.edu/ark:/67531/metadc741066/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.