There is the manual method, basically using tools from companies like APTARE or Tek-Tools, to analyze the storage environment. Determine what files have not been accessed in a period of time and then move those files to one of the above secondary tiers of storage. There is a challenge in how you actually move that data and where the user goes to find the data once the move has been completed.
I also like that we are seeing some of the API sets from cloud providers like Nirvanix, Iron Mountain and others to eventually be able to do meta data tagging. When software applications support this a user should be able to set a migration and even retention policy at the point of creation. If we can get the users to take the extra step and provide the meta data information, this could be a big relief for storage managers.
Alternatively there is the concept of global file systems or file virtualization. While some manufacturers have this built into their NAS solutions like NetApp, others have a broader solution that supports multiple manufacturers. Companies like F5, AutoVirt and EMC's Rainfinity all provide this technology. Think of file virtualization as a DNS for files. You don't need to know a file's location, just its name.
These systems can be automatically based on file attributes like age or access and move data from one storage platform to another and do so transparently to the user. Something to be careful with is the level of granularity that the policy can be applied. Some file virtualization solutions are only granular to a folder level, meaning that the folder has to meet the policy, not the files within the folder.
In an effort to address the ever increasing types of data tiers available, data management is quickly evolving, manual tools are becoming easier to use, self service models are coming to market, and technologies like file virtualization that make the whole process transparent are maturing. Maybe data management won't require so much brain power in the future.
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George Crump is lead analyst of Storage Switzerland, an IT analyst firm focused on the storage and virtualization segments. Find Storage Switzerland's disclosure statement here.