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When shopping for backup hardware, you ll need to make sure that the product you select supports the types of backups you plan to perform. In general, all backup software will allow you to perform cold backups. However, software packages must be specifically designed to allow for hot backups. As we ll see in 6, SQL Server 7 can perform both operations. Later in this chapter, we ll look at third-party software packages that can provide the same feature.
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One important factor in determining the type of data protection hardware and software you need is not what you lack, but what you already have. For example, if several of your servers are already performing local backup operations, you will want to determine how best to incorporate the existing tools into your new solution. Perhaps there is software available that can manage all of those servers from a single console, thereby allowing centralized administration while still maximizing the value of the original investment. Or perhaps your system includes a remote site that is currently performing its own data protection. If the current backup routine is acceptable, you will want to exclude this amount of data when considering new backup hardware and software purchases. Additionally, in an environment where funding is constrained, you might need to look at unconventional backup methods. For example, in a workgroup environment, several client machines may have free hard disk space. Copying information between systems can provide for adequate data protection until a server is deployed for centralized storage. Leveraging the existing infrastructure, however, can sometimes be counterproductive. The cost savings associated with managing older hardware might be offset by increased administration. An obvious example would be a tape backup drive that does not have enough capacity to store all important information on the same media. You ll definitely hear from systems administrators who must constantly swap tapes on these machines. Apart from the tedium of the process, it can be much more error-prone. Finding a balance between making the best of existing hardware and completely discarding your existing solutions can be challenging, but is important to maximizing your investments.
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In most environments that consist of more than a few client machines, backups are performed over the network. It is this backbone that connects all the computers together and is responsible for all communications. A local area network (LAN) is usually defined as a network that is owned and operated by an organization. Generally, this is restricted to machines that are located in the same geographic location and connected by Ethernet cables. In general, the speeds offered on LANs are quite high. As more machines are added to such a network, however, the network can become saturated and cause a bottleneck for various types of applications. The solution is to divide these connected machines logically, and thus decrease the sharing of media.
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There are several ways that larger networks can be formed from many little ones. It is beyond the scope of this book to discuss the issues associated with network design, but routing and switching technologies can make a big difference in how backups are performed. For example, if all of your company s servers are located on an isolated subnet that is separated from others by a switch or router, performing backups of all servers can be performed without causing excessive traffic for other machines. Figure 5-3 shows an example of a network connected by a router. Network issues are especially important when wide area networks (WANs) are used. In contrast to LANs, WANs are not entirely controlled by an organization; they are at least partially dependent on leased, public lines. An example of a WAN would be several remote offices connected by analog, ISDN, frame-relay, or T-1 lines. (These types of lines provide much lower bandwidth than typical LAN connections; consequently, the amount of data that can be transferred over a WAN is severely limited.)
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NOTE: The Internet is an excellent example of collaboration among many different types of interconnections. The Internet is unique in that it is a worldwide, global, public network. Internet Service Providers (ISPs) and telecommunications companies provide the backbone of this network, but the Internet is available to almost anyone, as long as they have the necessary equipment and software. However, issues such as traffic congestion and reliability are very real, and must be taken into account.
A good data protection strategy will consider the existing network topology and take full advantage of the resources already in place. In the case of several remote sites that are connected by a slow WAN, a separate tape backup drive attached to a server in each location might be best. If all data is stored on a single LAN, however, a centralized backup solution is worthy of consideration.
Figure 5-3.
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