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Failed to start Remount Root and Kenal File System

[root@localhost ~]# xfs_repair
Usage: xfs_repair [options] device

Options:
  -f           The device is a file
  -L           Force log zeroing. Do this as a last resort.
  -l logdev    Specifies the device where the external log resides.
  -m maxmem    Maximum amount of memory to be used in megabytes.
  -n           No modify mode, just checks the filesystem for damage.
  -P           Disables prefetching.
  -r rtdev     Specifies the device where the realtime section resides.
  -v           Verbose output.
  -c subopts   Change filesystem parameters - use xfs_admin.
  -o subopts   Override default behaviour, refer to man page.
  -t interval  Reporting interval in seconds.
  -d           Repair dangerously.
  -V           Reports version and exits.