Usage: /usr/bin/llsom_sync [options] -u <userid> -m <mdtdev> <mntpt>
options:
	-d, --daemonize
	-i, --interval, poll interval in second
	-a, --min-age, min age before a record is processed.
	-c, --max-cache, percentage of the memroy used for cache.
	-s, --sync, data sync when update LSOM xattr
	-v, --verbose, produce more verbose ouput