Moderator: Please post threads in the forum area for the product you are using.
Thread moved to the ESXi area.
I'm afraid that you will have to take a reboot into account.
Anyway, please provide some information about the hardware (serer vendor/model, RAID controller, ...).
At least for HPE Pxxx controllers, I'm currently not aware of a RAID reconfiguration that will be recognized without a host reboot.