FIBRE CHANNEL

By Mark A. KellnerSpecial to GCNIt's an apocryphal saying, often attributed to the great man of hard disk technology, Al Shugart, even if no one can quite recall him saying it: 'The great thing about hard drives is, when people fill them up, they buy bigger ones.''But today, having a bigger storage system isn't necessarily better, and that's where Fibre Channel technology comes in.Fibre Channel is, at base, a series of specifications for interconnecting large arrays of disk drives with various computer systems. It allows systems managers to combine data warehouses spread over a campus or'with repeaters'a metropolitan area.It makes it easier to avoid failures of troubled systems because connection speeds are faster: 1 Gbps now, and soon two, four and 10 times that speed. Fibre Channel connections are multi-protocol, allowing various types of data communications quickly and easily.Edward M. Frymoyer, a leading Fibre Channel analyst and teacher in Half Moon Bay, Calif., pointed out other benefits. 'It gives users greater efficiency, with a more effective capacity utilization, so there's less additional storage capacity needed,'' he said. 'You get a system with 80 percent useful bandwidth vs. less than 30 percent. Users also find Fibre Channel provides easier, more integrated management, and future-proofing, since this technology will be around for many years.''Aggregating data resources is an important factor in Fibre Channel's growth, said Dennis Talluto, an Electronic Data Systems Corp. technology manager in Auburn Hills, Mich., and chairman of the Fibre Channel Association, a trade group.'Fibre Channel itself is a family of standards and specifications that describe a robust technology,'' he said. 'There are a lot of very robust and powerful features both in silicon and in the protocol that allow users to accomplish this.''Talluto said the technology was designed to utilize the best attributes of a channel, a LAN and a WAN to build a powerful infrastructure technology. Because Fibre Channel has a variety of strong attributes, he said, users can create infrastructures that deliver newer and better classes of service and perhaps open the door for applications that could not run previously on a particular system.'Probably one of the strongest motivations for using Fibre Channel to build system and storage area networks is its connectivity capability,' Talluto said. 'Because it is serial and optical, you can connect systems and storage products that are physically located further from each other'' than the systems and storage products that can be linked using other technologies.'Because you can cluster these systems and storage products, you can create systems of higher availability than previous configurations,' Talluto said.He added, 'The concept of doing storage area networks and of implementing SANs for shared storage among computers and clusters of computers is now becoming understood. Fundamentally, what is taking place now is that the idea has been accepted and Fibre Channel is the technology of choice to do this, and the user market is working through the issues of implementing those technologies in their infrastructures.''The rapid growth of the Fibre Channel market'analyst Frymoyer predicted it will grow from $5.5 billion this year to $30 billion annually in five years'makes it easier to convince high-level management of the usefulness of the technology. Organizations and enterprises are seeing the value, speed and reliability of Fibre Channel (see story, next page) and are rushing to embrace the technology, along with mainstream computer and storage vendors such as Compaq Computer Corp., Dell Computer Corp., Hitachi America Ltd. of Brisbane, Calif., IBM Corp. and many others.'I believe what is actually driving the market is the explosion of information ' the Internet and 'webification' of data, making [information] available to anyone at any time,'' Talluto said.'Putting larger and larger disk drives in everyone's desktop PC doesn't bring a competitive advantage. Even in technical infrastructures that do not contain major data centers, users are going to consolidate their storage; they will leverage the value of that information,'' he said.The move toward Fibre Channel will come as much from an evolution in corporate data strategy as from anything else, Talluto said. 'As users and corporate IT managers evaluate their infrastructure options, as they work through their business and technical options and strategies, commercial viability and future capabilities will cause people to focus or begin to look at Fibre Channel-based technologies, systems adapters, switches and storage products,'' he said.Although the initial advantage of Fibre Channel is that it speeds communications between computers and data warehouses, the ability to access and manipulate data more quickly and in more diverse ways is a large part of the payoff. When users consolidate their data stores and establish appropriate configurations and security, data is more easily shared by clients and users, Talluto said.Uses for Fibre Channel range widely over the business landscape. One of the most popular is to ensure the failover of critical systems.One business user, Blue Cross/Blue Shield of Tennessee, has reported that using Fibre Channel not only helped it avoid losing production when a storage subsystem failed, but also contributed to a 10 percent productivity boost. In this instance, the user also found its Hewlett-Packard Co. systems were able to recognize the drives as SCSI devices, eliminating the need for new device drivers.These are the kinds of advantages that are making Fibre Channel attractive, Talluto said.'The National Football League and the National Basketball Association are two of the biggest users of Fibre Channel technologies,'' he said. 'It used to be that video film from games had to be manually distributed. Now it's done electronically via very high-performance workstations connected on Fibre Channel infrastructures.'Another area in which Fibre Channel is gaining popularity, he said, is in avionics and fire prevention systems. It also is being evaluated for use in distributed in-seat processing, which will let users connect to host computers, via radio communications, during a flight. 'These are bet-your-business applications,'' Talluto said.Configuring and buying Fibre Channel systems can present a challenge, Frymoyer said. The increasing number of products means a wider range of choices.'You have to choose equipment carefully,'' Frymoyer said. 'I would suggest that users begin working with a major integrator, such as EDS, Arthur Andersen & Co. or some of the specialized integrators. Heterogeneous systems are coming along, but you need to be careful that all the parts really do work well together.''In the near term, much of Fibre Channel's growth will be within campus networks and, using repeaters that can boost transmission distance from 10 kilometers to 120 kilometers within a metropolitan area. But Talluto says that work is under way within the American National Standards Institute to develop standards that will increase Fibre Channel communications ranges. XXXSPLITXXX-