When installing Ambari on CentOS6.x using the Cluster Installer Wizard at the Host Checks step, one or more host checks may fail if you have not disabled Transparent Huge Pages on all hosts. Host Checks warns you when a failure occurs. To disable THP:
Add the following command to your /etc/rc.local file:
RHEL6
if test -f /sys/kernel/mm/redhat_transparent_hugepage/defrag; then echo never > /sys/kernel/mm/redhat_transparent_hugepage/defrag fi
SLES
if test -f /sys/kernel/mm/transparent_hugepage/defrag; then echo never > /sys/kernel/mm/transparent_hugepage/defrag fi
To confirm, reboot the host. Then, run the following command:
$ cat /sys/kernel/mm/transparent_hugepage/enabled always madvise [never]
