When does an election happen for a Ceph monitor?

Solution Verified - Updated

Environment

  • Red Hat Ceph Storage 1.2.3

  • Red Hat Ceph Storage 1.3

Issue

  • When does an election happen for a Ceph monitor?

  • Does a monitor election happen in a healthy Ceph cluster?

Resolution

  • A monitor election will happen any time a change in the monmap (monitor map) happens.

  • Network connectivity, latency, and clock synchronization problems are some of the causes.

  • If a monitor is in-accessible and is marked down, a change is needed in the monitor map. This can trigger a monitor election.

Root Cause

  • Monitor elections can happen when there is a change in the monitor states in a Ceph cluster, for example, one of the monitor going down.
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