What are different full and nearfull ratios in Ceph ?

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Issue

  • What are different full and nearfull ratios in Ceph ?
  • What are the best practices we should be following in terms of setting the values for the following Ceph variables?

    mon_osd_full_ratio
    mon_osd_nearfull_ratio
    osd_failsafe_full_ratio
    osd_failsafe_nearfull_ratio
    osd_backfill_full_ratio
    

Environment

  • Red Hat Ceph Storage 1.3.z
  • Red Hat Ceph Storage 2.y

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