HOWTO: Manage Access Control List (ACLs)

An ACL (access control list) is a list of permissions associated with a file or directory. These permissions allow you to restrict access to a certain file or directory by user or group. 

OSC supports NFSv4 ACL on our home directory and POSIX ACL on our project and scratch file systems. Please see the how to use NFSv4 ACL for home directory ACL management and how to use POSIX ACL for managing ACLs in project and scratch file systems. 


NetCDF (Network Common Data Form) is an interface for array-oriented data access and a library that provides an implementation of the interface. The netcdf library also defines a machine-independent format for representing scientific data. Together, the interface, library, and format support the creation, access, and sharing of scientific data.

For mpi-dependent codes, use the non-serial NetCDF module.


HDF5 is a general purpose library and file format for storing scientific data. HDF5 can store two primary objects: datasets and groups. A dataset is essentially a multidimensional array of data elements, and a group is a structure for organizing objects in an HDF5 file. Using these two basic objects, one can create and store almost any kind of scientific data structure, such as images, arrays of vectors, and structured and unstructured grids.

For mpi-dependent codes, use the non-serial HDF5 module.

maintenance outage on the Cluster Export Services

There will be maintenance on cluster export services on Tuesday, April 14 from 8:00am to 10:00am. The following services will be affected by this: Ruby: A reboot of login nodes. Jobs submitted from directories in /fs/project or /fs/scratch will not run during the outage, but jobs using only home directories and $TMPDIR will continue to run. Access to /fs/project and /fs/scratch from the Ruby login nodes will also be unavailable. OnDemand: The OnDemand services will be inaccessible.

Minimal impact on OSC services due to COVID-19

The Ohio Supercomputer Center, The Ohio State University and the Ohio Department of Higher Education are closely monitoring the impacts of the COVID-19 outbreak. In response to guidance from the State of Ohio, ODHE and OSU, OSC been directed to move to telework effective Friday, March 13th to reduce the odds of transmission of the virus. The impact on service delivery is expected to be minimal. OSC Help and 24/7 hardware monitoring will continue as normal.