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What Should Every Good SAN Do
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It is apparent that given the increased storage capacity requirements and the fact that there are increasingly more users attempting to gain access to stored files, businesses need systems that can scale without creating further management issues. They require uninterrupted application availability in addition to faster access of their stored
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Understanding Storage Area Networks
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data. A SAN disaster-recovery detail report (along with a business continuity plan) can help to justify investments in SANs. Downtime losses per hour vary by business and industry, but the hourly average downtime loss is approximately $84,000. A generic SAN can be implemented for approximately $150,000 contingent on costs per port. Many people agree that SAN architectures offer the best solutions to ensure ongoing business operations and continuity. Therefore, what should we look for in a well-configured SAN A good SAN should provide greater capacity and be able to store more than 500 GB of data. A good SAN also should provide data availability and faster access.
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Not every SAN is alike. While designing your SAN, of course, you ll want it to address your specific needs. However, there are a few ground rules. A well-designed SAN will achieve the following: Externalized storage to gain the benefits of improved performance. This will provide freedom from server outages, higher data accessibility, higher system availability, and easier management at a lower cost. Centralized storage repositories such as backup, archives, references, documents, data warehouses, and/or other shared resources. This will lower administrative costs and improve data access. Remote clustering solutions. This will establish real-time dynamic business continuity rather than just throwing data over the wall. More specifically, the major features that a well-designed SAN offers include
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High bandwidth 2 Gbps Disaster recovery plans Business continuity plan Manageability
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Understanding Storage Area Networks
1 Easy integration Lower total cost of ownership
The Preferred Technology That Powers a SAN
Presently, Fibre Channel is used because it has characteristics that are suited to SCSI and storage. The ability to pool storage resources in order to increase the accessibility and manageability of data is the principal advantage of a Fibre Channel SAN. The following comparison puts this nicely into perspective: Imagine that you have a file that is represented by a stack of 500 sheets of paper. With Fibre Channel, I simply would hand you the stack for processing. Using Transmission Control Protocol/Internet Protocol (TCP/IP), for example, I would give you the stack one sheet at a time!
Summary
To summarize, a SAN is a high-speed dedicated network, not unlike a LAN, that establishes a direct connection between storage elements, clients, or servers. SANs rely on Fibre Channels for higher throughput, greater distancing, and enhanced connectivity options between servers and storage devices. They can be built as switchedor shared-access networks, and they offer improved scalability, fault recovery, and diagnostic analysis information while maintaining higher availabilities than current approaches. Although typically spoken of in terms of hardware, SANs include specialized software to manage, monitor, and configure system data storage. Additionally, in the design of a SAN, we know that important considerations include high bandwidth, a disaster recovery plan, a business continuity plan, easy manageability and integration, and lower total cost of ownership. In 2, Understanding How a SAN Works, we will delve into just how a SAN works and the recent improvements that have advanced SAN technology.
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