Running rsync will check the modification time and size of each file, and will only transfer the file if one or the other does not match. they are geographically apart or on different networks. Rsync is a popular tool for ensuring that two separate datasets are the same but can be quite slow if there are a lot of files or there is a lot of latency between the two sites, i.e. If you want to depend on this, it is important to check the "preserve source file modification times" option when initiating a Globus transfer.įor more information about Globus please see Globus. This will check the file's recorded modification time and only transfer the file if it is newer on the source than the destination. If the file size has changed then its contents must have changed, and it will be re-transferred. Useful if you are incrementally creating files.Ī quick test. This will only transfer files that have been created since the last sync. This will catch changes or errors that result in the same size of file, but with different contents. This is the slowest option but most accurate. You may choose how Globus decides which files to transfer: If some of the files may already exist on the destination and need not be transferred if they match, you should go to the bottom of the transfer window as shown in the screenshot and choose to "sync" instead. Normally when a Globus transfer is initiated it will overwrite the files on the destination with the files from the source, which means all of the files on the source will be transferred. We find Globus usually gives the best performance and reliability. Here are several different ways to do this. To synchronize or "sync" files (or directories) stored in two different locations means to ensure that the two copies are the same. The two are compared in this StackExchange article. The standard tool for downloading data from websites is wget. Ssh -A perform the ~]$ scp file the World Wide Web For example, to copy files to Niagara from Cedar, use: Note: If you want to transfer files between another of our clusters and Niagara use the SSH agent forwarding flag -A when logging into another cluster. However, other common tools can also be found for transferring data both inside and outside of our systems, including Globus is the preferred tool for transferring data between systems, and if it can be used, it should. Globus transfers can be set up and will go on in the background without you. If it takes more than one minute to move your files to or from our servers, we recommend you install and try Globus Personal Connect. PuTTY comes with pscp and psftp which are essentially the same as the Linux and Mac command line programs. Setting up a connection to a machine using SSH keys with WinSCP can be done by following the steps in this link. On Microsoft Windows platforms, MobaXterm offers both a graphical file transfer function and a command-line interface via SSH, while WinSCP is another free program that supports file transfer. The commands scp and sftp can be used in a command-line environment on Linux or Mac OS X computers. You will need software that supports secure transfer of files between your computer and our machines. 4.3 Using checksums to check if files match.
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