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  1. Core Server
  2. SERVER-33537

High write IO after 3.6 upgrade

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    Details

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

      Description

      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?

        Attachments

        1. diagnostic.data.tar
          62.42 MB
        2. flushes.png
          flushes.png
          139 kB
        3. Screen Shot 2018-02-28 at 10.03.46.png
          Screen Shot 2018-02-28 at 10.03.46.png
          811 kB
        4. Screen Shot 2018-02-28 at 10.07.47.png
          Screen Shot 2018-02-28 at 10.07.47.png
          770 kB
        5. Screen Shot 2018-02-28 at 10.25.08.png
          Screen Shot 2018-02-28 at 10.25.08.png
          855 kB
        6. Screen Shot 2018-02-28 at 10.25.32.png
          Screen Shot 2018-02-28 at 10.25.32.png
          843 kB

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              Assignee:
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              Reporter:
              tarvip Tarvi Pillessaar
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