SANs: Toward The Information Utility.

West World is proud to introduce Fred G. Moore to our readers as Editor-in-Chief Storage. Fred himself needs no introduction to anyone involved with the storage industry for the last twenty years. After a distinguished career at StorageTek he founded and is still president of Horison, Inc., a leading information strategies consultancy. Fred will guide our storage coverage in Computer Technology Review, Storage Inc. and Storage Management Solutions with special emphasis on SAN technologies and applications.

Vision is not seeing things as they are, but 7 rather seeing things as they will be. Fifty years ago, people would often store their money in their home under a mattress or in a box. Even though banks were common and gaining popularity, many thought that the risk was too high to let someone else keep their most valuable asset--their money. But the banks had vision; they realized that if they could guarantee that people could more safely store and retrieve their money than they could at home and that it would always be available, they would create a financial storage utility that people everywhere could access. To further encourage new business and growth, the banks decided to add value to the money deposited and increase its value by offering interest and dividends. It wasn't too long before the banks became a financial utility for virtually everyone.

The banking model also serves as an example for the exploding data storage industry. As money was the most valuable asset for the individual a half century ago, the next century promises that data will be the most valuable asset of the information based society. Can we guarantee that someone can safely store and retrieve their data today? Not just yet, but we are getting closer. The IT industry has undergone an evolution in data storage since its beginning. Throughout the 1970s and 1980s, storage deployment could be described as a "Many to One" with all storage devices connected to the server, typically a mainframe. During the late 1980s and 1990s, a One to One relationship developed between the server and storage devices. Devices were dedicated to a particular server, as departmental and distributed servers became widespread. Servers and storage were co-located. The LAN had now materialized. This decentralized approach created islands of computing and storage that were costly to manage and replicated hardwa re, software, and personnel across these isolated nodes of computing and data. Most often in this computing model, data was not accessible to another server in the LAN in case of failure and applications that weren't in a clustered or an SMP (Symmetrical Multi-Processor) designed system were unavailable until they could be restarted. The most critical and valuable element of the enterprise. the data, was too often unavailable and the costs for an unscheduled outage remained severe for most every business. Like the bank, the evolving storage industry also has a vision and it has arrived in the form of the Storage Area Network (SAN).

The long journey for the SAN is just beginning, but it promises to bring to the Information Age a roadmap needed to transform islands of data to the level of a true utility, universally accessible, sharable, and ubiquitous. The SAN may be ahead of its time, but is not ahead of its vision. The longer view for SANs significantly challenges and eventually replaces the traditional practice of using a general-purpose server as a storage repository. The high-speed network fabric constructed from storage interfaces connects a pool of data storage devices to a group of servers and allows storage devices and servers to be added and removed independently of each other. In the SAN, data is shared rather than connected to and owned by a server. An unscheduled outage on a server need not affect access to data in the SAN model. You can store and retrieve data in the SAN vision much in the same way as you can store and retrieve your money in a bank. With secure branch banking and ATMs, you don't even have to go to the phys ical bank anymore for storage and retrieval. Remote access brought banking to nearly every customer instead of bringing every customer to the bank. Likewise, the SAN will bring data (and subsequently information) to the customer rather than the customer to the data.

Where are we on this journey? Is the roadmap developed and supported by all of the providers of SAN components? Do we presently have agreement on standards, the network fabric, security rules, interfaces, common storage format, and the necessary software to manage the SAN resources and standards as the banking industry has? Answers to these questions actually form the basis for the SAN roadmap and most of these issues remain unanswered. Today, we continue to tactically debate over Fibre Channel, SSA, and SCSI interfaces as to which one is better for the SAN fabric. Longer-term, it doesn't really matter which interface we choose, since interfaces will continue to evolve, improve, and be replaced. There will be several choices. Will wireless ever become a SAN interface? Step out of the box for a moment. Imagine in our vision the day arrives that the wireless SAN (another fabric) evolves and each one of us becomes a node on a SAN. Just as an example, biometrics is the discipline of life measurement and early te sts are underway to help patients, athletes, Mount Everest climbers, and airline pilots, among others, monitor bodily conditions. Using wireless and wearable computing appliances, continual biometric feedback about our physical condition will be constantly sent, analyzed, and returned to us to warn of possible bodily malfunction.

The SAN journey definitely lies ahead of us. Everyone today can have the same server, the same storage devices, the same software products and network topology but no one can have your data. We have taken the first few steps in an evolution of computing that has seen the DNA of the IT industry become the data itself. The excitement surrounding SANs is real and the promise of the SAN, like that of the bank fifty years ago, becomes the foundation for a new utility, the information utility.