What does the message "smartd[<pid>]: Device: /dev/sdd [SAT], 6 Currently unreadable (pending) sectors" mean and what to do about it?

Solution In Progress - Updated -

Issue

Server is logging below messages continuously

<timestamp> <nodename> smartd[<pid>]: Device: /dev/sdd [SAT], 6 Currently unreadable (pending) sectors

Environment

  • Red Hat Enterprise Linux 7
  • smartmontools

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