Red Had Linux Home

New in RHEL 6.0

ext4 is the default file system
uuid is used by default in the /etc/fstab file
upstart has replaced the init
Mounting via NFS default to NFS 4
In addition to /etc/sysctl.conf file, there is also /etc/sysctl.d directory. Instead of modifying directly /etc/sysctl.conf, files can be placed under /etc/sysctl.d directory.
modprod.d directory instead of /etc/modprobe.conf

Some use full Links for Redhat Linux / Centos