Instal on mdadm raid error

$ sudo mdadm --create --verbose /dev/md0 --level=0 --raid-devices=2 /dev/vda /dev/vdb
mdadm: array /dev/md0 started.

$ sudo ros install -d /dev/md0
The file /host/dev/md01 does not exist and no size was specified.

$ ls /host/dev | grep md

Where did he get this device: md01 ??

$ cd /host/dev
$ sudo ln -s mdop1 md01

And now it works!

Yes, it works!
But after reboot, it can’t boot!

try add ln section in rc.local using write_files instructions or using bootcmd.