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CephFS via our Data Transfer Nodes

To request a new group on the DTN, please contact hsrn-support@nyu.edu. Once a group has been created, users can be added from NYU's Grouper system.

Accessing the DTN

The DTNs are accessible via SSH at dtn2.hsrn.nyu.edu. Please use your NetID and password to log in.

For example:

ssh rr2369@dtn2.hsrn.nyu.edu

You will find the Ceph filesystem (CephFS) at /ceph/

Using rsync

You can use the rsync tool to efficiently copy files from or to the filesystem. For example:

rsync -av --progress my/local/data rr2369@dtn2.hsrn.nyu.edu:/ceph/rr2369/data

Using SFTP

SFTP is available and should work with any compatible file browser application. Use the URL sftp://dtn2.hsrn.nyu.edu:/ceph.

On MacOS, use Finder > Go > Connect to Server, and enter the URL.

Using Globus

Globus is not yet available for CephFS. Stay tuned!

Network restrictions

Access to the DTNs is only possible from NYU Networks, including the High Speed Research Network (HSRN), campus workstations, and wifi.

If you are not on an NYU network, you will need to connect to NYU's Virtual Private Network (VPN).

Troubleshooting

Connection Timeouts

Cause: Network connectivity issues or misconfigured firewall settings.

Solution:

  • Check if the DTN is reachable by running ping dtn2.hsrn.nyu.edu in your Terminal.
  • Make sure you are in either on the HSRN or NYU network, otherwise use a VPN.

Permission Errors

If you're experiencing permission errors while accessing files or directories, it's usually due to improper file access rights or user configurations.

Check file permissions:

ls -l /path/to/file

This will show the file's permissions, notably read (r) and write (w) permissions.

Slow Transfers

Use the Right Tool for Large Transfers

Transferring many files with scp can be slow and inefficient.

Better Options:

  • rsync (for Mac/Linux): Efficiently syncs directories and resumes interrupted transfers. It only sends the parts of files that have changed.
  • robocopy (for Windows): A built-in command-line tool optimized for large, reliable transfers.