Data Migration

Written by Serena Berger
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Data migration refers to the process of transferring data from one storage device to another. It is often necessary to move data from high-speed storage devices to low-speed storage devices. This is because storing data on high-speed devices like hard disks is typically more expensive than storing data on low-speed devices such as discs and tapes. In this regard, data migration may also be referred to as "hierarchical storage management."

If cost were not an issue, you could save all of your data on high-speed devices. You could use hard disks to backup all of your files. The cost per byte, however, makes using discs and magnetic tapes more affordable. When the data stored on the removable media is needed, you can move it back to a hard disk so that it can be accessed.

Using Data Migration to Backup Files

If your company's computers are connected on a network, you may have files that people store on the server so that everyone can access them. Someone might also keep a working copy of a file on his local computer and just use the server to back up his work. You can then use software to back up the data on your server; many firms choose to do this on a daily basis, moving data from hard disk to removable media so that employees could recover an old version of a file if necessary.

You could migrate data from one computer to another, which is a viable option if you want to back up the full contents of your server. This procedure, however, would overwrite any previous data that had been stored on the second computer. Your company should determine the length of time for which you need to store copies of your files and plan your data migration procedures accordingly.


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