"ceph health" prints a warning on clock skew, what would be the reasons?

Solution In Progress - Updated -

Issue

  • The Ceph clusters show a 'clock skew' health warning daily for a few times.

  • This goes on for a few minutes or hours, but is cleared automatically.

  • The machine is synced with the ntp server, and the sync process is fine.

Environment

  • Red Hat Ceph Enterprise 1.3.x

  • Red Hat Ceph Enterprise 2.x

  • Red Hat Ceph Storage 3.x

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