AWS ParallelCluster internal directories
There are several internal directories that AWS ParallelCluster uses to share data within the cluster. The following directories are shared between the head node, compute nodes, and login nodes:
/opt/slurm
/opt/intel
/opt/parallelcluster/shared (only with compute nodes)
/opt/parallelcluster/shared_login_nodes (only with login nodes)
/home (unless specified in SharedStorage)
Note
By default these directories are created on the head nodes EBS volume and shared as NFS exports to the compute and login nodes. Starting from AWS ParallelCluster 3.8 you can enable AWS ParallelCluster to create and manage an Amazon EFS filesystem to host and share these directoreis by setting the SharedStorageType parameter to efs.
When the cluster scales out, NFS exports via the EBS volume may pose performance bottlenecks. Using EFS, you can avoid NFS exports as your cluster scales out and avoid performance bottlenecks associated with them.
