![]() Graphical User Interfaces for drag and drop file transfer SFTP should be used when you may need an interactive session on the cluster to navigate to a directory before transferring the files, whereas SCP should be used when you know the exact path of the file you want to transfer. Once you are done with sftp, you would type “exit” to end the session.Īlthough both SCP and SFTP utilize the same SSH encryption during file transfer with the same general level of overhead, SCP is usually faster than SFTP at transferring files, especially on high latency networks. In addition to “ls” and “cd” you can use the “get” command to transfer a file from the cluster it to your local system, or the “put” command to transfer a file from your local system to the cluster. From here you can use the shell command “ls” to get a directory listing, and and “cd” to change directories. Once you’ve connected, you’ll be shown an “sftp>” prompt. Sftp with scp, you would be prompted for your password. The “sftp” command is another means of transfering data to and from the cluster. The period stands for your current directory. Note that there is a space and a period at the end of that command. For example, if you ant to copy the file data2.txt from your home directory on the cluster, you would. Scp you want to copy a file from the cluster to your local laptop/desktop, you would reverse the arguments. ![]() For example, if you want to copy the “data.txt” file to /dcs04/mylab/data on the cluster you would run: You can also specify a different target directory other than your home directory. Once you enter the above comand, you will be prompted for you password on the JHPCE cluster, and when that is entered correctly, your data transfer will begin. Scp data.txt tilde “~” is a shortcut to represent your home directory. The command to transfer a file called “data.txt” from your local system to your home directory on the cluster would be: ![]() The “scp” command can be though of as a “network cp” command. The scp and sftp commands are available from the Terminal on a MacOS or Linux based laptop/desktop, or from a CMD or Powershell prompt on recent Windows 10 systems. The differences are described below (taken from wikipedia ). The basic tradeoff is between speed (scp is faster) and flexibility (sftp is more flexible). The scp and sftp command-line tools are the most common tools used for transferring data to and from the cluster. While an individual file transfers would not be able to achieve the full 40Gb/s speed, it will be significantly faster than using the 1Gb/s connection on the “ ” The “ ” node only has a 1 Gb/s network connection to the JHU network, whereas the “ ” node has a 40 Gb/s connection. The “ ” node is only meant to be used for logging into the cluster, and not transferring large files.
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