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To: mahler_one who wrote (38309)	2/28/2002 6:23:49 PM
From: Greg h2o	Read Replies (1) \| Respond to of 42804

good article: "The Potential of IP Storage" by David M. Piscitello Core Competence, Inc. and the Internet Security Conference THE POTENTIAL OF IP STORAGE Two key indicators tell me that networked storage is a mature technology. The first is that most everyone in the industry can explain the difference between a storage area network (SAN) and networked attached storage (NAS). Immediate recognition of an industry acronym is always a signal that a technology is on everyone's radar, and it's been some time since anyone concluded that I was asking about the San Diego and Nassau airports, which share these same acronyms. The second is that storage has embraced IP and Ethernet. And no other combination of communications technologies is a clearer signal of a march toward ubiquity and commoditization than IPoE. MORE THAN STORAGE Our information compulsive society has an insatiable appetite for storage, and it is the one appetite that technology is currently able to appease, affordably. Bandwidth is woefully lacking everywhere but the local area and core networks. Operating system and office application upgrades assure that we never have enough CPU and memory. But we can afford storage aplenty. The problem however, is not simply how much storage we have but our growing inability to efficiently manage the vast and disperse repositories we're storing. Networked storage -- or more precisely, storage management applications -- address this problem in several ways. They provide the ability to efficiently archive and restore information, eliminating the waste incurred by storing and repeatedly storing, let alone archiving, dozens if not hundreds of copies of the same information. This, in turn, creates efficiencies in cataloging information, assuring information accuracy, facilitating search and retrieval or timely restoration. IP-networked storage also offers certain efficiencies and improved scalability, redundancy, and diversity in server (farm) architectures by introducing the ability for servers to communicate with storage over potentially long distances. Perhaps most overlooked and singularly important however, are the improvements in accountability and auditiing that networked storage ma yield. Current events and new legislature remind us that all organizations will be held more accountable for information they have been charged to safeguard. Improving accuracy alone makes networked storage useful in industries where information is regulated (e.g., health care), but consider the luxury of having confidence that only the approved and "signed-off" copies of documents are preserved - in a lawsuit, the fact that you know exactly what will surface during the discovery process is an invaluable asset. We are fast approaching a time when organizations large and small will recognize that it's better to know exactly what information they have stored and the legal ramifications of holding such information than to be rudely awakened in a court of law following a discovery process. The fact that even small organizations can accrue the benefits of networked storage makes the IP in storage most significant. FAMILIARITY BREEDS CONTENT Nothing disrupts any operations staff, be it small or large, than the introduction of radically new technology and infrastructure. What IP brings to storage, and the reason it's destined to succeed, is familiarity. By deploying iSCSI, for example, SMB's can create networks of storage devices using familiar Ethernet technology. These can be reliably accessed by hosts and servers using TCP/IP. The TCP connection essentially acts like storage bus in a block storage (SCSI) I/O operation. This simple explanation alone will set many an admin's mind at ease: "I know SCSI, I know IP, I know Ethernet -- kewl!!" At the risk of being criticized for painting the rosiest of pictures, it seems that the path to commoditized hardware will come quickly for iSCSI, and that first-generation performance will soon be improved by TCP offload engines and more highly integrated NIC and storage host bus adapters. I can't help but believe that storage management software prices will follow, or that SMB suitable storage management software will come to play. "IP" storage comes in different flavors and can deliver benefits to large enterprises as well. Large enterprises can create TCP/IP tunnels to connect geographically distributed Fibre Channel anywhere they can find adequate bandwidth to satisfy storage application requirements, using the soon-to-be Fibre Channel over IP (FCIP) Internet standards- track protocol. There is also a standards-track protocol (iFCP) for connecting Fibre Channel storage devices or SANs using IP instead of Fibre Channel switches. Organizations in metro areas where Gigabit Ethernet service is offered can look to IP storage as a means of satisfying business continuity requirements. While technology constraints currently hamper such deployment, Gigabit services may eventually extend this reach nationally and internationally. NEW SERVICE OPPORTUNITIES It's too early to predict whether IP storage will rejuvenate the sagging ASP market, but there's optimism that IP storage introduces several promising applications for outsourcing: network client access to remote storage, remote mirroring between storage controllers, remote backup/recovery, business continuation and resource consolidation at a secure hosting center are all viable opportunities. TEMPERING THE ENTHUSIASM The promise is evident, but the path forward has some (ahem) minor obstructions. The Internet (IETF) standards for transporting block storage over IP aren't ready yet, so interoperability problems may initially deter or plague companies who place a heavy emphasis on this requirement. Conventions for resource naming and discovery mechanisms are needed. Storage applications often require bounded latency, so IP deployments may require DiffServ or MPLS support for quality of service assurances. Once IP addressable, storage devices and networks must incorporate security measures sufficient to defend against a panoply of threats. While strong authentication, data origin verification, and data integrity and confidentiality are under consideration by the standards community, it's essential that organizations factor storage security into their security policy and implementation. Consider these carefully as you select product, and be certain that your vendor of choice has a well-conceived path towards a standards based solution. But don't hesitate to consider networked storage. Now that it's IP-based, it's very likely to factor into your future networking.