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Export Nodes: Transfer Data to/from ZIH's Filesystems

To copy large data to/from ZIH systems, the so-called export nodes should be used. While it is possible to transfer small files directly via the login nodes, they are not intended to be used that way. Furthermore, longer transfers will hit the CPU time limit on the login nodes, i.e. the process get killed. The export nodes have a better uplink (10 GBit/s) allowing for higher bandwidth. Note that you cannot log in via SSH to the export nodes, but only use scp, rsync or sftp on them.

The export nodes are reachable under the hostname taurusexport.hrsk.tu-dresden.de (or taurusexport3.hrsk.tu-dresden.de and taurusexport4.hrsk.tu-dresden.de).

Please keep in mind that there are different filesystems. Choose the one that matches your needs.

Access From Linux

There are at least three tools to exchange data between your local workstation and ZIH systems. They are explained in the following section in more detail.

Important

The following explanations require that you have already set up your SSH configuration .

SCP

The tool scp (OpenSSH secure file copy) copies files between hosts on a network. To copy all files in a directory, the option -r has to be specified.

Example: Copy a file from your workstation to ZIH systems
marie@local$ scp <file> taurusexport:<target-location>

# Add -r to copy whole directory
marie@local$ scp -r <directory> taurusexport:<target-location>

For example, if you want to copy your data file mydata.csv to the directory input in your home directory, you would use the following:

marie@local$ scp mydata.csv taurusexport:input/
Example: Copy a file from ZIH systems to your workstation
marie@local$ scp taurusexport:<file> <target-location>

# Add -r to copy whole directory
marie@local$ scp -r taurusexport:<directory> <target-location>

For example, if you have a directory named output in your home directory on ZIH systems and you want to copy it to the directory /tmp on your workstation, you would use the following:

marie@local$ scp -r taurusexport:output /tmp

SFTP

The tool sftp (OpenSSH secure file transfer) is a file transfer program, which performs all operations over an encrypted SSH transport. It may use compression to increase performance.

sftp is basically a virtual command line, which you could access and exit as follows.

# Enter virtual command line
marie@local$ sftp taurusexport
# Exit virtual command line
sftp> exit
# or
sftp> <Ctrl+D>

After that you have access to the filesystem on ZIH systems, you can use the same commands as on your local workstation, e.g., ls, cd, pwd etc. If you would access to your local workstation from this virtual command line, then you have to prefix the command with the letter l (local),e.g., lls, lcd or lpwd.

Example: Copy a file from your workstation to ZIH systems
marie@local$ sftp taurusexport
# Copy file
sftp> put <file>
# Copy directory
sftp> put -r <directory>
Example: Copy a file from ZIH systems to your local workstation
marie@local$ sftp taurusexport
# Copy file
sftp> get <file>
# Copy directory
sftp> get -r <directory>

Rsync

Rsync, is a fast and extraordinarily versatile file copying tool. It can copy locally, to/from another host over any remote shell, or to/from a remote rsync daemon. It is famous for its delta-transfer algorithm, which reduces the amount of data sent over the network by sending only the differences between the source files and the existing files in the destination.

Type following commands in the terminal when you are in the directory of the local machine.

Example: Copy a file from your workstation to ZIH systems
# Copy file
marie@local$ rsync <file> taurusexport:<target-location>
# Copy directory
marie@local$ rsync -r <directory> taurusexport:<target-location>
Example: Copy a file from ZIH systems to your local workstation
# Copy file
marie@local$ rsync taurusexport:<file> <target-location>
# Copy directory
marie@local$ rsync -r taurusexport:<directory> <target-location>

Access From Windows

First you have to install WinSCP.

Then you have to execute the WinSCP application and configure some option as described below.

Login - WinSCP

Save session as site

Login - WinSCP click Login

Enter password and click OK

After your connection succeeded, you can copy files from your local workstation to ZIH systems and the other way around.

WinSCP document explorer