why Ext3 filesystem shows used space that doesn't match with available space in DF command output?

Solution Verified - Updated -

Issue

  • Ext filesystem shows used space that doesn't match available space in df command output .
Filesystem                     Size  Used  Avail  Use%  Mounted on  
/dev/mapper/vg00-lv_dump       63G   58G   924M   99%   /dump
  • The issue is the available space is 63 GB and used is 58 GB but df shows 99% filesystem is full.
  • If disk size is 772GB and 73MB is used then why df shows available size 733GB?

Environment

  • Red Hat Enterprise Linux
  • ext3/4 filesystem

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