Creation of a RAID device (Unit 24)
Lab 24.1 tells us to
run partprobe or kpartx or reboot after you are done to make sure the system is properly aware of the new partitions.
directly after creating the partitions with fdisk,
the first question on the quiz for Unit 24 tells us to reboot as the last step, after fdisk, creating and putting a file system on the RAID device and updating the /etc/mdamd.conf file.
It would seem to me that if we are checking whether Linux sees the new partitions we have created, it would be logical to reboot directly after fdisk.
What say ye?