LVM2

Create a new physical volume on the new disk:

sudo pvcreate /dev/vdb
sudo lvmdiskscan -l

Add the newly created physical volume (/dev/vdb) to an existing logical volume:

sudo vgextend almalinux /dev/vdb

Extend the /dev/almalinux/root to create a total 1000GB:

sudo lvm lvextend -l +100%FREE /dev/almalinux/root

Grow the filesystem of the root volume:

# ext4
sudo resize2fs -p /dev/mapper/almalinux-root

# xfs
sudo xfs_growfs /