Restore noatime option for NFS filesystem

According to the documentation below noatime is going to have a positive impact on the performances avoiding write operations when accessing files on a mounted NFS filesystem:

* https://www.cyberciti.biz/faq/linux-unix-tuning-nfs-server-client-performance
* https://tldp.org/LDP/solrhe/Securing-Optimizing-Linux-RH-Edition-v1.3/chap6sec73.html

Signed-off-by: Luca Carrogu <[email protected]>

Author: lukeseawalker

CHANGELOG.md

@@ -9,6 +9,9 @@ This file is used to list changes made in each version of the AWS ParallelCluste
 **ENHANCEMENTS**
 - Retry failed installations of aws-parallelcluster package on head node of clusters using AWS Batch as the scheduler.
 
+**CHANGES**
+- Restore ``noatime`` option, which has positive impact on the performances of NFS filesystem
+
 **BUG FIXES**
 - Pin to version 1.247347.6b250880 of the CloudWatch agent due to performance impact of current latest version.
 

attributes/default.rb

@@ -400,7 +400,7 @@
 end
 
 # Default NFS mount options
-default['cfncluster']['nfs']['hard_mount_options'] = 'hard,_netdev'
+default['cfncluster']['nfs']['hard_mount_options'] = 'hard,_netdev,noatime'
 
 # Lustre defaults (for CentOS >=7.7 and Ubuntu)
 default['cfncluster']['lustre']['public_key'] = value_for_platform(