Root filesystem went to read only after the upgrade from RHEL6 to RHEL7

Solution Verified - Updated -

Issue

  • After the upgrade to RHEL 7, the root filesystem stays read-only, and can't be remounted read/write:

    mount -o remount,rw /
    mount: / not mounted or bad option
    
           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    

Environment

  • RHEL 6 upgrade to RHEL 7

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