RHEL Boot Hangs

Issue

• Its fresh Install of RHEL 6.4, Installing Oracle DB on it.
• Did following changes in system as part of Oracle installation:

vi /etc/sysctl.conf
#oracle entries
kernel.shmall = 4294967296
kernel.shmmax = 101532981248
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
fs.file-max = 6815744
fs.aio-max-nr = 1048576
net.ipv4.ip_local_port_range = 9000 65500
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144

vi /etc/security/limits.conf
oracle          soft    nproc           8000
oracle          hard    nproc           16384
oracle          soft    nofile          3500
oracle          hard    nofile          65536

vi /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#       enforcing - SELinux security policy is enforced.
#       permissive - SELinux prints warnings instead of enforcing.
#       disabled - SELinux is fully disabled.
SELINUX=permissive
# SELINUXTYPE= type of policy in use. Possible values are:
#       targeted - Only targeted network daemons are protected.
#       strict - Full SELinux protection.
SELINUXTYPE=targeted

• Post these changes RHEL Boot Hangs.