> my kernel options: ro root=/dev/mapper/vg_nb-lv_root
> rd_LVM_LV=vg_nb/lv_root rd_NO_LUKS rd_NO_MD rd_NO_DM
You want to use "rd.luks.uuid" kernel option. See "man
dracut.kernel".
rd_NO_LUKS (or rd.luks=0) disables LUKS detection
entirely. I believe this is not about initrd...
Jan