Dear Christian,
Can you please detail a little how/where you added the rootdelay parameter.
I am facing the same problem with a 4 drive raid1 on a HP MicroServer Gen8, on 
update from Ubuntu server 16.04 to 18.04 (kernel 4.4 to kernel 4.15).
I tried to add the parameter to /etc/default/grub in both 
GRUB_CMDLINE_LINUX_DEFAULT or GRUB_CMDLINE_LINUX= with no success, and then 
update-grub, grub-install /dev/sda.
sda is 3tb hdd gpt
I tried to increase rootdelay up to 90 still no boot.
On boot i can confirm that the rootdelay is added to commandline if i try to 
edit the entry.
For now i am booting with old 4.4 kernel, but i dont't think this is ok in the 
long run.
Thanks in advance.

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https://bugs.launchpad.net/bugs/1752961

Title:
  With kernel 4.13 btrfs scans for devices before all devices have been
  discovered

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