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  1. Core Server
  2. SERVER-33537

High write IO after 3.6 upgrade

    • Type: Icon: Question Question
    • Resolution: Duplicate
    • Priority: Icon: Minor - P4 Minor - P4
    • None
    • Affects Version/s: 3.6.3
    • Component/s: Write Ops
    • Environment:

      Yesterday I upgraded one of our 3.4 mongodb cluster to 3.6 (3.4.9 -> 3.6.3).
      After upgrade I noticed increased write IO (IOPS and throughput).
      Added also 2 screenshots, upgrade was done at 5:20.

      When looking with iotop, I can see WTOplog.lThread is writing a lot, does it mean that 3.6 writes more oplog? Is it something that is expected or is it regression?

        1. diagnostic.data.tar
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        2. flushes.png
          flushes.png
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        3. Screen Shot 2018-02-28 at 10.03.46.png
          Screen Shot 2018-02-28 at 10.03.46.png
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        4. Screen Shot 2018-02-28 at 10.07.47.png
          Screen Shot 2018-02-28 at 10.07.47.png
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        5. Screen Shot 2018-02-28 at 10.25.08.png
          Screen Shot 2018-02-28 at 10.25.08.png
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        6. Screen Shot 2018-02-28 at 10.25.32.png
          Screen Shot 2018-02-28 at 10.25.32.png
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            Assignee:
            Unassigned Unassigned
            Reporter:
            tarvip Tarvi Pillessaar
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              Created:
              Updated:
              Resolved: