Why Ceph cluster is reporting HEALTH_WARN with 'pools have too many placement groups' in RHCS 4.x ?

Solution Verified - Updated -

Issue

  • ceph status showing health is in HEALTH_WARN state

    cluster:
    id:     xxxxxx-xxxx-xxxx-xxxx-xxxxxxxx
    health: HEALTH_WARN
          2 pools have too many placement groups

  • Ceph cluster reports HEALTH_WARN with pools have too many placement groups in RHCS 4.x

Environment

  • Red Hat Ceph Storage 4
  • Red Hat Enterprise Linux 7, 8

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