Issue

• I had a problem to install Red Hat Enterprise Linux 7 with kickstart. The installation stopped on the way.
• I configured the LVM on MD raid in kickstart file as below.

part raid.01 --size=512 --ondisk=sda
part raid.02 --size=131072 --grow --ondisk=sda
part raid.03 --size=512 --ondisk=sdb
part raid.04 --size=131072 --grow --ondisk=sdb

raid /boot --fstype=ext4 --level=1 --device=md0 raid.01 raid.03 
raid pv.01 --fstype=ext4 --level=1 --device=md1 raid.02 raid.04 
volgroup vg_root pv.01 
logvol / --fstype=ext4 --name=lv_root --vgname=vg_root --size=16384 
logvol swap --fstype=swap --name=lv_swap --vgname=vg_root --size=8192 

• I found the following error in /tmp/program.log.
  ~~
  XX:XX:XX,XXX INFO program: Running... lvm pvcreate --config devices { preferred_names=["^/dev/mapper/", "^/dev/md/", "^/dev/sd"] } /dev/md/1
  XX:XX:XX,XXX INFO program: Can't open /dev/md/1 exclusively. Mounted filesystem?
  XX:XX:XX,XXX DEBUG program: Return code: 5
  ~~~
• How can I avoid this problem?