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Evaluating Data Protection Solutions
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As you consider what sort of backup scheme will best support your business, do consider these important issues: w Business requirements A common reason for failing to choose appropriate backup technologies is a lack of understanding of the environment. IT staff might see issues from a technical standpoint. For example, if data storage requirements have increased dramatically in past months, a larger and more expensive tape backup system might be chosen. However, in meeting with managers, IT administrators may find that backing up all the information on these servers is unnecessary, because some information can be easily re-created from other sources. Understanding these types of issues is critical to making a sound decision when you re choosing hardware and software. Costs of administration Any data protection solution, no matter how automated, will need some level of human involvement. However, the level of effort required from systems administrators can vary widely from product to product. When evaluating the costs of a product, be sure to consider the potential cost of not choosing various options. An example that leaps to mind is deciding whether or not to invest in tape autoloaders (which we ll cover later in this chapter). On one hand, autoloaders can save time and reduce the chances of human error (which, on a manually loaded machine, can include incorrect tape changes or simple forgetfulness). On the other hand, autoloaders can be quite expensive, and in some companies, managers might wonder what systems administrators are being paid for if they don t have time to change the backup media evey day. Budget A simple fact of life for most organizations is that money can be scarce. When you re devising a data protection plan, it s important to be realistic. In the best case, you will have sufficient resources for purchasing hardware and software that allow you to save all of your important information regularly. More realistically, however, you'll need to make some t. It s important that you know what these tradeoffs are as you select your backup solution. For example, if only a subset of database information can be protected by the solution you select, you should document this limitation up-front. That way, there will be fewer questions if a problem does occur. The question of what to protect, however, can be fraught with political problems and systems administrators who wish to avoid them should ensure that managers and end users are the ones who make the ultimate decisions. IT should focus instead on ensuring that those decisions are technically feasible and providing any necessary technical advice.
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The end of this chapter covers some concepts that you can use to justify an investment in new hardware and software, and describes ways of measuring whether or not your choices make sense from a business point of view. Now, let s move on to look at some detailed requirements of our solution.
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Before you can begin to seriously shop around for tape backup hardware, you should have a realistic estimate of the amount of data you will need to protect. Clearly, your approach to backing up 2GB of data would differ greatly from your strategy for backing up a server farm consisting of .5TB. In this section, we ll look at ways in which you can determine your current storage requirements and plan for the future. This information will be very important in helping you choose a suitable backup platform.
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Sometimes, it s easy to estimate data storage requirements. For example, SQL Server 7 allows you to easily see the size of a database by using Enterprise Manager or stored procedures. On file and print servers, you can quickly find out how much information is currently being stored by viewing disk capacity and the percent in use. One good way to do this is to use Windows NT Performance Monitor. The Physical Disk and Logical Disk objects allow you to view the current usage of your disk resources. Another major advantage of using Performance Monitor for this task is that you can easily find information about remote servers and workstations from the comfort of your own machine. For more information on using Performance Monitor in Windows NT/2000, see 3, Data Protection in Windows NT/2000. Also, in later chapters, we ll see methods for determining the size of your existing databases, and some ways to make predictions of its future size.
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