Why removing data from RBD disk does not free-up space on ceph cluster and do we have to always perform fstrim to free up space?

Solution Verified - Updated -

Issue

  • Do we need to return capacity using fstrim command?
  • Are there any way I can automatically reclaim disk space for deleted data without performing fstrim?
  • If we don't perform fstrim, can the OSDs become full even if deleting the files?

Environment

  • Red Hat Ceph Storage
  • Red Hat Enterprise Linux 7.X

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