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The administration of a backup solution is, perhaps, one of the most important factors contributing to the success of a data protection plan. Making the plan too dependent on human intervention will likely cause problems in the long run. On the other hand, relying too much on automated processes can cause systems administrators to pay less attention than they should to these important operations. Additionally, the costs and tedium of managing such a solution will be quite high. There are two basic methodologies that might be employed. In many cases, centralizing the administration and management of data protection makes sense. In this way, all actions can be coordinated among the individuals and computers involved. However, this might not work well in other situations. If you have several branch offices that have systems support personnel and slow WAN links, it s probably better to perform backups at each site. Other business models lend themselves to decentralized (or distributed) administration. This is the case, for example, in companies where each department has its own IT department. The rationale behind this setup is that the specialized needs of each of those departments will be better managed by employees of those departments.
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Centralized vs. Distributed Data Storage
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When deciding where to store data, organizations must evaluate the relative costs of keeping data in a single location versus distributing it throughout the organization. The case for centralized data storage can easily be made for all of the resources that are stored within a single site connected by a high-speed network. This information can be accessed, managed, and backed up as a central repository. Again, the benefits include reduced time and effort for administration. Distributed data storage, on the other hand, is much more appropriate for environments where information resides on servers that are connected by slow network connections placed in branch offices. In this case, it is not practical to transfer user files and database information from remote sites, due to bandwidth restrictions. Larger companies will combine both strategies. For example, data will be stored centrally for all machines
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within the corporate office, whereas remote locations will be responsible for their own data protection.
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A newer concept in the realm of backup and restoration is the Storage Area Network (SAN). SAN technology segregates all data storage resources into a single area on the network. Information is managed within massive arrays, which are then accessed by all the servers in the environment. A SAN network generally consists of servers that are connected together through the use of Fibre Channel architecture, which can greatly increase performance. Figure 2-3 provides a graphic overview of a SAN topology. The key difference between a SAN backup and standard server-based backups is that centralized servers are responsible for backing up all the information stored within the SAN. In this way, a SAN provides for easier management and for performance that can keep up with today s fastest backup hardware. The SAN methodology also avoids several problems related to resource usage. First, in a typical remote backup scenario, network bandwidth requirements for backups can be quite high. Backup servers compete for network resources with users of the system, thus causing potential bottlenecks and reduced performance. Establishing a baseline of network performance can be helpful in determining the relative requirements. The problem is even worse over slow WAN links. Second, SANs provide for centralized storage and administration. Instead of having to work with hundreds of servers that are located throughout an enterprise network, systems administrators can focus on controlling resources that are isolated from the rest of the environment. Finally, SANs bring the advantage of modularity and efficient disk space utilization. Any number of servers may be able to attach to a given storage resource. This can improve performance by allowing multiple database servers to access the same disk resources, for example and disk space can be more efficiently utilized, because free space can be reallocated as business needs change. SAN technology also has its drawbacks, however. Since the idea of SANs is relatively new in the marketplace, vendors must still do some work to make sure that products integrate properly and that standards are developed and upheld. Some questions regarding the actual performance benefits of using a SAN have also been raised. Is it really cost-efficient to invest in implementing a SAN architecture when existing network resources are so cheap For some organizations, the time, money, and effort will be justified. For others, however, more traditional data storage methods will persist, at least for the next several years, because it is too costly to upgrade a working infrastructure.
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