1 charray 
2?  -name new_name_arg
3?  -sparegoal  1-100
4?  -balanced
5?  -slowwritepriority
5.1 latency
5.1 redundancy
6?  -rebuildareasgoal
6.1 0
6.1 1
6.1 2
6.1 3
6.1 4
7 mdisk_id
7 mdisk_name