Second, even if you were able to find a single platform that could cover the wide majority of your data needs, you can't control acquisitions and mergers. Your company may acquire another company or you may be acquired. The chances of the other company having the same storage hardware as you is relatively low. It is also unlikely that you are going to be able to throw out whatever storage hardware that the other company was using and buy new equipment that matches your own. Reality will mandate that you integrate the two storage platforms as best you can.
Third, there is also the practical matter of keeping everyone honest, or at least on their toes. If you have other storage vendors for your data center it is going to reduce the risk of a vendor getting complacent. This is not just a matter of price but also capability. If you only have one vendor, and that vendor starts to fall behind in technical feature set, moving to another platform that is more feature rich could be challenging.
Once you accept the fact that multiple storage vendors are going to exist in your data center. The next step is to decide how many are you going to have? My advice is to limit the number of vendors to two or three but if you put the right vendor neutral storage management tools in place then it is really up to you which platform you choose to host your applications on and how many of platforms you need.
The tools available to manage a mixed storage vendor reality have matured greatly over the past few years and there are several choices to make when it comes to how you are going to manage that environment. There are storage appliances that can virtualize a variety of attaching storage devices. These appliances essentially "turn-off" the feature set of your current storage systems and then replace it with their own. There are also software managing and monitoring tools that provide a centralized view of storage that allow you to keep the specific features of your storage systems "turned-on". Most of these tools require that you still go to the storage systems individual GUI to take action though. There are also the operating systems or hypervisors that can now provide much of the storage management or intelligence that used to be the sole domain of the storage system.
We will detail each of these methods in upcoming entries but it is important to realize that managing a mixed vendor environment is more possible then ever. Given the realities of budgets, mergers, acquisitions and meeting varying degrees of data demands a mixed vendor storage model may not just be reality, it may be the best possible option.
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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.