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Data Movement

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NOTE: This page is under construction.

There are various Linux native commands that you can use to move your data within the HPC cluster, such as mv, cp, scp etc. One of the most powerful tools for data movement on Linux is rsync, which we'll be using in our examples below.

rsync and scp can also be used for moving data from a local storage to Cheaha.

Contents

RSync

To find out more information such as flags, usage etc. about any of the above mentioned tools, you can use man TOOL_NAME.

[build@c0051 ~]$ man rsync

NAME
       rsync - a fast, versatile, remote (and local) file-copying tool

SYNOPSIS
       Local:  rsync [OPTION...] SRC... [DEST]

       Access via remote shell:
         Pull: rsync [OPTION...] [USER@]HOST:SRC... [DEST]
         Push: rsync [OPTION...] SRC... [USER@]HOST:DEST

       Access via rsync daemon:
         Pull: rsync [OPTION...] [USER@]HOST::SRC... [DEST]
               rsync [OPTION...] rsync://[USER@]HOST[:PORT]/SRC... [DEST]
         Push: rsync [OPTION...] SRC... [USER@]HOST::DEST
               rsync [OPTION...] SRC... rsync://[USER@]HOST[:PORT]/DEST

       Usages with just one SRC arg and no DEST arg will list the source files
       instead of copying.

DESCRIPTION
 .
 .
 .

If you are interested in finding out about various methods of moving data and various tools which can be used to achieve that aim, this page provides a very good description/guide : How to transfer large amounts of data via network..

Moving local data to Cheaha

To move data from your local storage to cheaha, using rsync, you can use the following command, on your local system:

rsync -aP PATH_TO_FILE_OR_DIRECTORY BLAZERID@cheaha.rc.uab.edu:PATH_ON_CHEAHA

where,

  • PATH_TO_FILE_OR_DIRECTORY is the full/relative path to file or directory that you want to move to cheaha. If transferring a directory, a trailing slash on the source creates an additional directory level at the destination. You can think of a trailing / on a source as meaning "copy the contents of this directory" as opposed to "copy the directory by name"
  • PATH_ON_CHEAHA is the full path on cheaha, where you want to move your directory. Remember, you have 20GB of space in your HOME directory, os if you are moving raw data to cheaha, please move it in either, /data/user/$BLAZERID or /data/scratch/$BLAZERID

Moving data on Cheaha to your local storage

To move data from cheaha to your local storage, using rsync, you can use the following command, on your local system:

rsync -aP BLAZERID@cheaha.rc.uab.edu:PATH_TO_FILE_OR_DIRECTORY_ON_CHEAHA PATH_ON_LOCAL_STORAGE

where,

  • PATH_TO_FILE_OR_DIRECTORY_ON_CHEAHA is the full path to file or directory on cheaha that you want to move to your local storage. If transferring a directory, a trailing slash on the source creates an additional directory level at the destination. You can think of a trailing / on a source as meaning "copy the contents of this directory" as opposed to "copy the directory by name"
  • PATH_ON_LOCAL_STORAGE is the full/relative path on cheaha, where you want to move your directory.

Privacy

Do not store sensitive information on this filesystem. It is not encrypted. Note that your data will be stored on the cluster filesystem, and while not accessible to ordinary users, it could be accessible to the cluster administrator(s).

Moving large amount of data on cheaha

If the data that you are moving is large, then you should always use either an interactive session or a job script for your data movement. This ensures that the process for your data movement isn't using and slowing login nodes for a long time, and instead is performing these operations on a compute node.

Interactive session

  • Start an interactive session using srun
srun --ntasks=1 --mem-per-cpu=1024 --time=08:00:00 --partition=medium --job-name=DATA_TRANSFER --pty /bin/bash

NOTE: Please change the time required and the corresponding partition according to your need.

  • Start an rsync process to start the transfer, once you have moved from login001 to c00XX node:
[build@c0051 Salmon]$ rsync -aP SOURCE_PATH DESTINATION_PATH

Job Script

#!/bin/bash
#
#SBATCH --job-name=test
#SBATCH --output=res.txt
#SBATCH --ntasks=1
#SBATCH --partition=express
#
# Time format = HH:MM:SS, DD-HH:MM:SS
#
#SBATCH --time=10:00
#
# Mimimum memory required per allocated  CPU  in  MegaBytes. 
#
#SBATCH --mem-per-cpu=2048
#SBATCH --mail-type=FAIL
#SBATCH --mail-user=YOUR_EMAIL_ADDRESS

rsync -aP SOURCE_PATH DESTINATION_PATH

NOTE:

  • Please change the time required and the corresponding partition according to your need.
  • After modifications to the given job script, submit it using : sbatch JOB_SCRIPT

FileZilla

Installation

FileZilla can be downloaded from the website https://filezilla-project.org/ under Quick download links. Download the FileZilla Client version to transfer from local to Cheaha.

A setup wizard window should be launched. Once the wizard is running, simply follow the prompts until the installation process is completed. After the installation procedure has been completed and the setup wizard has terminated, open FileZilla and proceed to connect it to Cheaha.


Connect to Cheaha (FTP Server) The first thing to do is connecting to a server. There are 2 ways to connect to Cheaha

1. Basic method Go to : File- Site Manager- New Site

  • Hostname cheaha.rc.uab.edu
  • Username and password would be the same as cheaha login details
  • Port : 22
  • Logon type – Normal
  • Protocol – SFTP -SSH File Transfer Protocol

2. Quick connect Enter the hostname into the quickconnect bar's Host: field, the username into the Username: field as well as the password into the Password: field. You may leave the Port: field empty unless your login information specifies a certain port to use. Now click on Quickconnect.


Transferring Data (Upload and Download Files)

1. Upload Data

First - in the local pane - bring the directory into view which contains data to be uploaded (e.g. index.html and images/). Now, navigate to the desired target directory on the server (using the server pane's file listings). To upload the data, select the respective files/directories and drag them from the local to the remote pane. You will notice that the files will be added to the transfer queue at the bottom of the window and soon thereafter get removed again - since they were (hopefully, if nothing went wrong) just uploaded to the server. The uploaded files and directories should now be displayed in the server content listing at the right side of the window.

2. Download Data

Downloading files, or complete directories, works essentially the same way as uploading - you just drag the files/directories from the remote pane to the local pane this time, instead of the other way round.