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  1. OpenVZ
  2. OVZ-7105

NVMe: iostat showing much 99% iowait on 7.6, 10% on 7.5

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      Reporter: Johann Carnevali, YOORshop SAS

      quote:
      =======================================================
      We discovered 2 months ago an issue on rhel 7, and reported bug to redhat company :
      https://bugs.centos.org/view.php?id=15723#c33753
      https://bugzilla.redhat.com/show_bug.cgi?id=1676402

      and which is unsure if they fixed, we alerted Cloudlinux team too to avoid they replicate this major issue.

      Issue has contaminated your last version :
      [root@vps1 ~]# uname -a
      Linux <hostname> 3.10.0-957.12.2.vz7.86.2 #1 SMP Wed May 15 09:45:34 MSK 2019 x86_64 x86_64 x86_64 GNU/Linux

      Issue is permanent and causing high disk usage on servers with NVMe disks....

      [root@vps1 ~]# iostat -x 1

      avg-cpu: %user %nice %system %iowait %steal %idle
                 0.63 0.00 1.13 0.00 0.00 98.25

      Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
      sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      nvme1n1 0.00 2.00 29.00 39.00 116.00 165.00 8.26 0.78 0.22 0.52 0.00 11.31 76.90
      md127 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      md126 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      nvme0n1 0.00 2.00 7.00 39.00 88.00 165.00 11.00 0.77 0.04 0.29 0.00 16.72 76.90
      md125 0.00 0.00 36.00 35.00 204.00 160.00 10.25 0.00 0.00 0.00 0.00 0.00 0.00
      md124 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      ploop46251 0.00 0.00 0.00 33.00 0.00 132.00 8.00 0.00 0.00 0.00 0.00 0.00 0.00
      ploop19286 0.00 0.00 36.00 1.00 204.00 24.00 12.32 0.00 0.00 0.00 0.00 0.00 0.00
      ploop57108 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      ploop34094 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      ploop63651 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      ploop14200 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      ploop14038 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      ploop62393 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      ploop27138 0.00 0.00 0.00 1.00 0.00 4.00 8.00 0.00 0.00 0.00 0.00 0.00 0.00
      ploop25365 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      ploop60777 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      =======================================================

      https://bugzilla.redhat.com/show_bug.cgi?id=1671551

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            • Assignee:
              khorenko Konstantin Khorenko
              Reporter:
              khorenko Konstantin Khorenko
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                Updated:
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