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Talk16 min

Direct IO, IO priority and Bandwidth Policies in EOS

Andreas Joachim Peters · CERN

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About

In preparation for Run-3 we have faced the following problem: we have to balance the usage of IO resources between individual activities, which has led to the implementation of IO priorities and bandwidth regulation policies. While commissioning the ALICEO2 EOS instance we have observed, that write performance using the buffer cache is a bottleneck on storage nodes. Direct IO helps to improve write performance on storage nodes and additionally to reduce tails in data upload times by experiment DAQ systems. The presentation will explain and implementation and how to use these features in production..

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The talk

  1. Direct IO, IO priority and Bandwidth Policies in EOS 2022-03-08 · 16 min · CERN's player

Credits and licence

Institution
CERN
Department
HEP Computing
Speaker
Andreas Joachim Peters
Year
2022
Language
English
Subjects
Computer science
Source
CERN
Licence
CERN, as CERN states it. CERN's terms
Attribution
© CERN. CERN provides its audiovisual media free of charge for educational and informational use, credited to CERN; this lecture is shown in CERN's own player.
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