Access, usage, and filesystem layout on the PPPL cluster

1. The PPPL cluster is only accessible from within the PPPL network.
2. All hosts, except for portal, are no-login machines, reserved for batch job processing. You cannot ssh to any individual host from outside the cluster.
   
3. You can ssh to portal.pppl.gov and be placed onto a host in a small pool of interactive hosts. From there, you can view files resident on batch-only hosts (see filesystem information below).
4. telnet and rsh are disabled.
5. ftp into any cluster node is disabled -- use scp.
6. ftp from cluster nodes is enabled.

1. The filesystems /u, /p, and /l are accessible on each node of the cluster and have read and write access. /u is for user home directories (for example, /u/wgrendel), /p is for project directories (for example, /p/gyro), and /l is for the /local directory resident on each cluster node (for example /l/dawson001 is the /local on node dawson001).
2. The systems in portal.pppl.gov have also mounted every local filesystem from every batch-only node in the cluster. The path is /l/<node>. For example, to see the files of the /local filesystem on dawson032, you would cd to the directory /l/dawson032.
3. All remote filesystems are mounted using the automount(8) daemon. Thus, the filesystem only becomes available when a user cds into a directory. For example, if you cd to /p, you might see only a few directories, but if you then cd to the directory you want to access, it will be automatically mounted for you.