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Transferring Data 9 July 2019 merlin6_sidebar /merlin6/transfer-data.html

Transferring Data from the PSI Network to/from Merlin6

Rsync

Rsync is the preferred method to transfer data from Linux/MacOS. It allows transfers to be easily resumed if they get interrupted. The general syntax is:

rsync -avAHXS <src> <dst>

For example, to transfer files from your local computer to a merlin project directory:

rsync -avAHXS ~/localdata user@merlin-l-01.psi.ch:/data/project/general/myproject/

You can resume interrupted transfers by simply rerunning the command. Previously transferred files will be skipped.

WinSCP

The WinSCP tool can be used for remote file transfer on Windows. It is available from the Software Kiosk on PSI machines. Add merlin-l-01.psi.ch as a host and connect with your PSI credentials. You can then drag-and-drop files between your local computer and merlin.

Transferring Data to/from outside PSI

Two servers are enabled for exporting data from Merlin to outside PSI. These Remote Access Merlin servers are the following:

  • 'ra-merlin-01.psi.ch'
  • 'ra-merlin-02.psi.ch'

Due to security reasons, currently only /data/user directories are exported in Read-Only mode. This policy will change in the future but in the meantime we allow users to export their files in an easy way.

{{site.data.alerts.warning}}Please, ensure proper secured permissions in your '/data/user' directory. By default, when directory is created, the system applies the most restrictive permissions. However, this does not prevent users for changing permissions if they wish. At this point, users become responsible of those changes. {{site.data.alerts.end}}

Transferring big amounts of data from outside PSI to Merlin is not possible yet, unless this is done from PSI (i.e. transferring files from CSCS to Merlin is possible by using scp / rsync commands from the Merlin6 login nodes).

Accepted protocols

Accepted protocols for Remote Access Merlin servers are the following:

  • sftp: sftp command or similar X11/Windows/MacOS based programs.
  • ssh: scp command (as well as WinSCP and similar programs) or rsync command
  • Globus Online: not available yet.

About Remote Access Servers

SSH is one of the allowed protocols.

  • Please, absolutely never use this servers as a login node.
  • Please avoid copying files to the home directories.

Only /data/user should be used on these nodes, and exclusively for transferring data to outside PSI.

Connecting to Merlin6 from outside PSI

Merlin6 is fully accessible from within the PSI network. To connect from outside you can use: