Keep in mind that more threads will need more CPU and memory to keep going. 8 is the default, and 16 is a reasonable number to test first. /MT:nn – Copy files using multiple threads, which you would define by replacing the nn placeholder with the number of threads./zb – Use restartable mode, and upon access denial, attempt to use the backup mode (shadow mode).This command works equally well over the network but to work to optimize the speed and performance, there are a few extra commands that can be very useful to use in conjunction with the /mir command. Test3.txt security properties Using the Mirror Command over the Network The verbose command is useful to see what Robocopy is doing and make sure the files that we want to copy are doing so. We will use two parameters, the Robocopy /mir command and the /v command for verbose logging and output. One of the simplest ways to take advantage of the mirror command is to simply mirror two directories on a single server. Mirror a Simple Directory to a Destination These changes are primarily around copying file security permissions which are made easier in the Vista version of Robocopy. There are many different ways to utilize the Robocopy /mir command, and certain behaviors have changed over time. Of course, there are plenty of scenarios where you would like the permissions to be copied and kept in sync those scenarios will be explored in further detail later on in the article. The unique file permissions will not be carried over. As you can see, the only permissions that are carried over are the unique folder permissions. The result of a mirror command will result in the following file and folder permission structure. What does this look like in practice? Let’s take the example source directory folder structure like so: This is by design as for performance, and for practical reasons, individual file permissions were not intended to be copied using the mirror command. When using the mirror switch, you might find that the file permissions themselves are not changed, only destination folder permissions. This can potentially delete files in the destination directory so use with caution! File and Folder Security with the Mirror CommandĪs mentioned above, there is a unique behavior related to security permissions and destination directories. mir along with a handful of other commands are destructive to data if used incorrectly. When using the /mir option, the security settings for the destination directory are overwritten. With the /e /purge options, a destination directories security settings are not overwritten. This type of scenario is exactly what the Robocopy /mir switch is made for!įunctionally, Robocopy /mir is equivalent to the /e /purge options in Robocopy with a small difference in behavior. This operation makes sure that all of the files in the source directory make it to the destination directory and remove all destination files that are not present in the source directory. To make sure we don’t run out of storage space, the ideal transfer operation is a copy and purge. Often manual backups or temporary copies are put into backup folders, and it is all too easy to run out of disk space. Since backup files can get quite large, perhaps we want to make sure that the destination folder does not grow too quickly with stale backup files. Let’s suppose that you have a temporary backup folder and you need to verify that all of the files in the source directory make it to a backup directory. If you want to learn more about robocopy, be sure to check out the Ultimate Guide to Robocopy! What is so special about Robocopy /mir? Although this switch is not a two-way synchronization, there are many handy uses! The Robocopy /MIR switch aims to make the process of keeping two directories synchronized that much easier. Synchronizing files is a challenging problem for a myriad of reasons. Easily able to handle complex file transfer tasks, RoboCopy is a tried and true swiss army tool for any number of file transfer scenarios. Robocopy is a top tool of system administrators around the world.
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