KVM guest low IO performance for newly created guests

Solution Verified - Updated -

Issue

Low IO performance for newly created guests

  • Various application processes doing IO receive hung_task_timeout_secs messages
  • Initially poor IO performance
  • IO performance improves after the file system has been filled up
    e.g. creating files filling up the file system and then removing them

Environment

  • Red Hat Enterprise Linux 6, 7
  • KVM guest

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