Linux Create Software RAID 1 (Mirror) Array
1. install md module
yum install mdadm
2. clean supber block
mdadm --zero-superblock /dev/sdc /dev/sdd
3. create raid 1
mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdc1 /dev/sdd1
4. now you can mkfs or use block dev derectly.
5. get raid info from md device
mdadm --query /dev/md0
原文：http://xmwang.blog.51cto.com/9889672/1678505