Transferring Files

CCS systems support multiple file transfer programs such as FileZilla and PSFTP, and common command line utilities such as scp and rsync. Use cluster head nodes (login nodes) for these types of file transfers. For transferring large amounts of data from systems outside the University of Miami, CCS ACS also offers a gateway server that supports SFTP and Globus.

Using command line utilities

Use cp to copy files within the same computation system. Use scp, sftp, or rsync to transfer files between computational systems (e.g., scratch space to Visx project space). When executing multiple instantiations of command line utilities like rsync and scp, please *limit your transfers to no more than 2-3 processes at a time.*

scp

An example transfer might look like this:

[localmachine: ~]$ scp /local/filename \
            username@pegasus.ccs.miami.edu:/scratch/projectID/directory

To transfer a directory, use the -r flag (recursive):

[localmachine: ~]$ scp -r /local/directory \
            username@pegasus.ccs.miami.edu:/scratch/projectID/directory

Consult the Linux man pages for more information on scp.

rsync

The rsync command is another way to keep data current. In contrast to scp, rsync transfers only the changed parts of a file (instead of transferring the entire file). Hence, this selective method of data transfer can be much more efficient than scp. The following example demonstrates usage of the rsync command for transferring a file named “firstExample.c” from the current location to a location on Pegasus.

[localmachine: ~]$ rsync firstExample.c \
            username@pegasus.ccs.miami.edu:/scratch/projectID/directory

An entire directory can be transferred from source to destination by using rsync. For directory transfers, the options -atvr will transfer the files recursively (-r option) along with the modification times (-t option) and in the archive mode (-a option). Consult the Linux man pages for more information on rsync.

Using FileZilla

FileZilla is a free, user friendly, open source, cross-platform FTP, SFTP and FTPS application.

Download the FileZilla client here: https://filezilla-project.org/download.php?show_all=1 and follow the installation instructions for the appropriate platform (http://wiki.filezilla-project.org/Client_Installation).

Launch FileZilla and open File : Site Manager.

Click the “New Site” button and name the entry. Pegasus example:

Host:       pegasus.ccs.miami.edu  or triton.ccs.miami.edu
Protocol:   SFTP
Logon Type: Normal
enter your username and password

Selecting Logon Type: Ask for password will prompt for a password each connection.

Click the “Connect” button. Once connected, drag and drop files or directories between your local machine and the server.

Using the gateway server

To transfer large amounts of data from systems outside the University of Miami, use the gateway server. This server supports SFTP file transfers. Users *must be a member of a project* to request access to the gateway server. E-mail hpc@ccs.miami.edu to request access.

SFTP

Host:  xfer.ccs.miami.edu
protocol:  SFTP
user:    caneid
pw:  [UM caneid passwd]
Folder: download/<projectname>

Open an SFTP session to the gateway server using your CCS account credentials: xfer.ccs.miami.edu

[localmachine: ~]$ sftp username@xfer.ccs.miami.edu
sftp> cd download
sftp> mkdir <project>
sftp> cd project
sftp> put newfile