Install OS and Software Raid 1

Hi,

maybe it’s a dumb question… but i’m going to do a new OS install in a server and need to set a raid 1 via software, do i need to install OS on both SSD’s or just in one?

Just one, directions are at https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/performing_a_standard_rhel_8_installation/graphical-installation_graphical-installation#creating-a-software-raid-during-the-installation_manual-partitioning

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Thanks for the answer and the link very helpfull, ended having to select both SSD’s. If not the installer will not make visible the RAID option in the selection.