1 mkextpool
2?  -dev storage_image_ID
3  -rankgrp
4 0
4 1
5  -stgtype
6 fb
6 ckd
7?  -extentlimit
7.1 enabled
7.1 disabled
8?  -limit extent_limit_percentage
9?  -threshold extent_threshold_percentage
10 extent_pool_name "-"