This document shows you how to use the NFSv4 ACL permissions system. An ACL is a list of permissions associated with a file or directory. These permissions allow you to restrict access to a certian file or directory by user or group. NFSv4 ACLs provide more specific options than typical POSIX read/write/execute permissions used in most systems.

Understanding NFSv4 ACL

This is an example of an NFSv4 ACL

HOWTO: Reduce Disk Space Usage

This "how to" will demonstrate how to lower ones' disk space usage.  The following procedures can be applied to all of OSC's file systems.

We recommend users regularly check their data usage and clean out old data that is no longer needed.

Users who need assistance lowering their data usage can contact OSC Help.

HOWTO: Install your own Perl modules

While we provide a number of Perl modules, you may need a module we do not provide. If it is a commonly used module, or one that is particularly difficult to compile, you can contact OSC Help for assistance, but we have provided an example below showing how to build and install your own Perl modules. Note, these instructions use "bash" shell syntax; this is our default shell, but if you are using something else (csh, tcsh, etc), some of the syntax may be different.

Glenn Retirement

Glenn Cluster Retired: March 24, 2016

The Glenn Cluster supercomputer has been retired from service to make way for a much more powerful new system. As an OSC client, the removal of the cluster will result in work being added to the heavy workload being handled by Oakley or Ruby, potentially impacting you.

Migrating jobs from Glenn to Oakley or Ruby

This page includes a summary of differences to keep in mind when migrating jobs from Glenn to one of our other clusters.


Most Oakley nodes have 12 cores and 48GB memory. There are eight large-memory nodes with 12 cores and 192GB memory, and one huge-memory node with 32 cores and 1TB of memory. Most Ruby nodes have 20 cores and 64GB of memory. There is one huge-memory node with 32 cores and 1TB of memory. By contrast, most Glenn nodes have 8 cores and 24GB memory, with eight nodes having 16 cores and 64GB memory.

LAMMPS 7Dec15 now available

Wednesday, February 3, 2016 - 12:45pm

LAMMPS stable version 7Dec15 has been installed on Glenn, Oakley, and Ruby.  Usage is via the modules lammps-7Dec15 on Glenn and lammps/7Dec15 on Oakley and Ruby.  For information on installation details, such as, available packages, see the output of the respective module help command, e.g.:  module help lammps/7Dec15


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