less diskinodes?
clean up your server by removing old kernels
check the ammound of old kernel versions
# rpm -q kernel(example output)
kernel-2.3.32-642.12.1.el6.x86_64
kernel-2.4.32-643.35.9.el6.x86_64
kernel-2.5.32-644.28.3.el6.x86_64
kernel-2.6.32-647.81.5.el6.x86_64
yum install yum-utils package-cleanup --oldkernels --count=2