Home directory

The home directory is intended for scripts, small application source code, and executables. There is not enough space in the home directory for large data files.

Each account has 1 GB of quota in /home/user_name.

This space is backed up daily. One copy of each file is retained in the backup. Deleted files are retained for about 7 days.

To check how much space is available in the home directory, type quota -s.

Scratch directory

Scratch space is intended for the storage requirements for running jobs. Applications should use scratch space during job execution, i.e., jobs should be submitted from /share.

Each project has 10 TB of quota in /share/group_name. Users should create a subdirectory under this location for their use:

cd /share/group_name
mkdir user_name
To find the group_name, see the first listed output from the groups command. This is the default group.

To check how much space is being used in a directory, type du -h -d 0. Depending on the amount of files, this may take a long time.

This space is not backed up. Files that have not been accessed in 30 days are automatically deleted.

Mass storage directory

Mass storage space is intended to hold important files that are too large to be stored in users' home directories. If an /ncsu/volume1/group_name directory does not exist, one can be requested by sending email to HPC Support.

There is a 1 TB group quota on this space.

Mass storage is accessible only from the login nodes. It is not available from compute nodes and cannot be used as an alternative to scratch space for running jobs.

The mass storage is a hierarchically managed file system consisting of a disk cache and a tape library. In order to speed archival and retrieval, a tar archive of a directory, including all files and subdirectories, should be used to store data. Storing many individual files may be distributed across numerous tapes and take a long time to retrieve in the event that the recovery of an entire directory is required.

This space is backed up daily. One copy of each file is retained in the backup. Deleted files are retained for about 7 days.

Partner Storage

If storage requirements for a project exceed what is available with existing resources, there is an opportunity to lease additional storage under the HPC Partner Program.

Learn More

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