关于RHEL 6 的/etc/modprobe.conf文件

On RHEL6, dracut is introduced instead of mkinitrd, then users will have 
to understand some difference with them to manage their systems. 
So, customer requests some documents about this. I think we need to 
provide the following information, at least.

 - changing package mkinitrd to dracut
   (this information has been in release notes and migration guide)
 - there isn't /etc/modprobe.conf by default
 - needing to add kernel parameter 'rdloaddriver' to order module loading
instead of 'scsi_hostadapter'
 - loading all drivers to initramfs by default

参考bug list：

参考官方文档：

第 8 章 内​​​核​​​

8.1. 内​​​核​​​

已​​​经​​​使​​​用​​​ mkinitrd 替​​​换​​​ dracut 工​​​具​​​。​​​同​​​时​​​不​​​再​​​默​​​认​​​使​​​用​​​ /etc/modprobe.conf 文​​​件​​​管​​​理​​​内​​​核​​​模​​​块​​​，但​​​如​​​果​​​手​​​动​​​生​​​成​​​则​​​仍​​​可​​​使​​​用​​​它​​​。​​​请​​​参​​​考​​​以​​​下​​​内​​​容​​​作​​​为​​​ dracut 工​​​具​​​用​​​法​​​示​​​例​​​：

# mv /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r)-new.img
# dracut --force /boot/initramfs-$(uname -r).img $(uname -r)