Hi, I have a test system that booted fine using "Legacy Bios” mode and using the following Kickstart snippet configured the disks correctly:- # Clear the Master Boot Record zerombr # Partition clearing information clearpart --all --initlabel # Disk partitioning information part raid.01 --fstype="raid" --ondisk=sda --size=500 part raid.02 --fstype="raid" --grow --ondisk=sda --size=1 part raid.03 --fstype="raid" --ondisk=sdb --size=500 part raid.04 --fstype="raid" --grow --ondisk=sdb --size=1 raid /boot --device=0 --fstype="xfs" --level=RAID1 raid.01 raid.03 raid pv.01 --device=1 --level=RAID1 raid.02 raid.04 For UEFi I changed it to the following:- # Clear the Master Boot Record zerombr # Partition clearing information clearpart --all --initlabel # Disk partitioning information part raid.01 --fstype="raid" --ondisk=sda --size=500 part raid.02 --fstype="raid" --grow --ondisk=sda --size=1 part raid.03 --fstype="raid" --ondisk=sdb --size=500 part raid.04 --fstype="raid" --grow --ondisk=sdb --size=1 raid /boot --device=0 --fstype="xfs" --level=RAID1 raid.01 raid.03 part /boot/efi —fstype=“efi” --grow --maxsize=200 --size=20 raid pv.01 --device=1 --level=RAID1 raid.02 raid.04 The install fails under UEFi due to the fact the partitions are not cleared, and it doesn’t have any space to continue. Is there an extra step I need to do to remove the original partitions before the new layout will work ? Thanks