I have RHEL 6.8 installed on a fake Intel RAID1 (Intel Matrix). It's managed by dmraid, consists of sda and sdb and the device name is /dev/mapper/ddf1_4c5349202020202080862682000000004711471100000a28p1
Now I want to write something else to sdb. How to do that without reboot? On mdadm-managed arrays it's easy:
mdadm --fail /dev/md126 /dev/sdb
mdadm --remove /dev/md126 sdb
