[root@work-06 boot]# cat /etc/modprobe.d/storage.conf
blacklist sr_mod
[root@work-06 boot]# dracut -f initramfs-`uname -r`.img `uname -r`
[root@work-06 boot]# lsinitrd initramfs-`uname -r`.img | grep sr_mod
-rw-r--r--   1 root     root        35933 Apr 12 15:51 usr/lib/modules/3.10.0-514.16.1.el7.x86_64/kernel/drivers/scsi/sr_mod.ko