#install debian 9 from dvd1 (to support boot from efi)

#create 512M EFI partition, raid10 30G, raid10 rest...
#create lvm (0) with vg=pve on md0
#create lvm (1) with vg=vm on md1
#create lvm swap and root on lvm (0)

apt-get update
apt-get dist-upgrade
apt install sudo htop iftop iotop mc nmap bridge-utils vim-nox mtr

Modify lines in /etc/default/grub to read:
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

Enter the following code into /usr/share/initramfs-tools/scripts/local-premount/sleepAwhile:
#!/bin/sh
echo
echo "sleeping for 30 seconds while udevd and mdadm settle down"
sleep 5
echo "sleeping for 25 seconds while udevd and mdadm settle down"
sleep 5
echo "sleeping for 20 seconds while udevd and mdadm settle down"
sleep 5
echo "sleeping for 15 seconds while udevd and mdadm settle down"
sleep 5
echo "sleeping for 10 seconds while udevd and mdadm settle down"
sleep 5
echo "sleeping for 5 seconds while udevd and mdadm settle down"
sleep 5
echo "done sleeping"

Make the script executable and install it.
chmod a+x /usr/share/initramfs-tools/scripts/local-premount/sleepAwhile
update-grub
update-initramfs -u

#Clone the EFI partition:
dd if=/dev/sda1 of=/dev/sdb1 ; dd if=/dev/sdb1 of=/dev/sdc1 ; dd if=/dev/sdc1 of=/dev/sdd1

efibootmgr -c -g -d /dev/sdb -p 1 -L "debian #2" -l '\EFI\debian\grubx64.efi'
efibootmgr -c -g -d /dev/sdc -p 1 -L "debian #3" -l '\EFI\debian\grubx64.efi'
efibootmgr -c -g -d /dev/sdd -p 1 -L "debian #4" -l '\EFI\debian\grubx64.efi'