Why host is flipping between connecting, non responsive , up status with timeout error for HostDevListByCapsVDSCommand

Solution Verified - Updated -

Issue

  • Host is unstable in the RHV-M and status is changing between connecting, non responsive, initializing and up.
  • Engine logs shows timeout error for HostDevListByCapsVDSCommand.
  • vdsClient -s 0 hostdevListByCaps hangs for 2 to 3 minutes and then it failed with error Connection to localhost:54321 refused.
  • All other vdsm commands like getcapabilities, getallvmstats etc. works fine without any issue.

Environment

  • Red Hat Virtualization 4.0.

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