There's no point in assigning a disk as a hotspare for a RAID 0. If you want to use the volume within your OS, you'll need to create a new virtual disk to do so. This is done within the Ctrl+R config utility. The 11th generation servers didn't have another location to deploy a virtual disk from, apart from using OpenManage within the OS.
I just bought an used server in the classifieds. Presently, I've got a RAID0 with 4 drives with 300GB each that I use for hosting virtual machines with Proxmox PVE and a 120GB SSD as boot drive where Proxmox is installed. I got an extra 1TB drive with the machine that I'd like to use for backups. At boot time, the server's config menu (using Ctrl+R) only offers to use the 1TB drive as a "hot spare" for the RAID, are there any other options?
PowerEdge T410: can I add a hardrive independently from the existing RAID0?