Usage: lustre_rsync [option] -s <lustre_root_path> -t <target_path>
	-m <mdt> -u <user id> -l <status log>
The Lustre rsync feature works by periodically running lustre_rsync,
a userspace program used to synchronize changes in the Lustre file system
onto the target file system. lustre_rsync can also pick up parameters
from a status log created earlier.
Options:
 -s, --source <path>	The source Lustre root path to be synchronized.
			Mandatory if --statuslog is not specified.
 -t, --target <path>	The target root path where the --source file system
			will be synchronized (target)
			Mandatory if --statuslog is not specified.
 -m, --mdt <mdt>	The metadata device to be synchronized.
			Mandatory if --statuslog is not specified.
 -u, --user <user id>	The changelog user ID for the specified MDT.
			Mandatory if --statuslog is not specified.
 -l, --statuslog <log file>
			Log file to which synchronization status is saved.
			The {-s,-t,-m,-u} options are read from log file
			if not explicitly specified.
 -x, --xattr <yes|no>	Synchronize extended attributes (xattr). Default: yes.
 -v, --verbose		Produces verbose output.
 -z, --dry-run		Perform a trial run with no changes made.
 -a, --abort-on-err	Stop on lustre_rsync error. Default: continue on error.
 -h, --help		Displays this help message.