1. [root@B79859E40B966873 cache-mht2]# xfs_repair 
    2. Usage: xfs_repair [options] device
    4. Options:
    5.   -f           The device is a file
    6.   -L           Force log zeroing. Do this as a last resort.
    7.   -l logdev    Specifies the device where the external log resides.
    8.   -m maxmem    Maximum amount of memory to be used in megabytes.
    9.   -n           No modify mode, just checks the filesystem for damage.
    10.   -P           Disables prefetching.
    11.   -r rtdev     Specifies the device where the realtime section resides.
    12.   -v           Verbose output.
    13.   -c subopts   Change filesystem parameters - use xfs_admin.
    14.   -o subopts   Override default behaviour, refer to man page.
    15.   -t interval  Reporting interval in seconds.
    16.   -d           Repair dangerously.
    17.   -V           Reports version and exits.