[PATCH] dm: add asymmetric stripe target device dirver

From: liuchaowei This asymmetric stripe target device driver can achieve better io performance between those devices which possess different io performance There are 2 storage device or flash devices: A and B, their sequential read performance are 220M/s and 315M/s respectively, so their sequent

[PATCH] dm: add asymmetric stripe target device dirver

From: liuchaowei This asymmetric stripe target device driver can achieve better io performance between those devices which possess different io performance There are 2 storage device or flash devices: A and B, their sequential read permance are 220M/s and 315M/s inspectively, so their sequential