According with the documenation Disable Transparent Huge Pages (https://docs.mongodb.com/v3.0/tutorial/transparent-huge-pages/), on the "Red Hat/CentOS 7" section, after the step 3
For both following commands:

cat /sys/kernel/mm/transparent_hugepage/enabled
cat /sys/kernel/mm/transparent_hugepage/defrag

Should outputs "always madvise [never]"

But I got:

1) always madvise [never]
2) [always] madvise never