I can't seem to figure out how to partition for install. I've tried both CentOS 8 and 7.7 netinstalls.
I've got 3 disks: sda (big hardware RAID array), sdb (SSD), and sdc (internal SD card for booting). I want to put /boot on sdc, /usr on sdb, and / on sda. I don't care what format is used on sdb and sdc, whatever will let it boot. I want LVM on sda so that I can use snapshotting for backups.
I can pre-format sdb1 and sdc1 as ext4 usinga gparted live DVD. If I select manual partitioning, I can then label and assign those two to /usr and /boot. I can see sda in the drives available on the first detination screen but but I don't see it in the manual partitioning screen. So I don't see how to partition and format it as an LVM volume that I can mount to /.