barcode generator vb.net Evaluating Corporate Data Requirements in Software

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Evaluating Corporate Data Requirements
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much more likely to occur than a hard disk crash. So, let s look at the real threats to your information to determine what you re actually protecting against.
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Most systems or network administrators have experienced the true mortality of computer hardware. Sometimes, equipment just fails. When talking about data protection, I often hear comments about protecting against hardware and software failures as the main reason for performing data protection. These problems are very real, and a few of us have stories about systems administrators who have lost their jobs over such losses. I can add my own story to that pool: I once worked in an environment in which a systems administrator was trying to replace a failed drive in a redundant array but pulled the wrong drive. We ll cover the technical details of RAID in later chapters, but if you re unfamiliar with RAID, you should know that this causes two failures and a total loss of that data. This is a good example of where a technical failure, combined with human error, contributed to a catastrophic loss of data. The general method of protecting against a hardware failure is to implement redundancy. Redundant systems often have one or more backup (redundant) parts that can be used in the event that the primary part fails. This is commonly done with power supplies and hard disks. Although the concept of redundancy has some negative connotations in conventional language, it is very important in data protection situations. Later in this book, we ll look at examples where redundant components can improve network performance. When you re designing a redundant system, manual intervention may be required to prevent downtime and to replace failed parts. Redundancy also applies to software and data; we maintain copies of this information on other forms of media so that it can be replaced if lost. Even within the area of hardware and software failures, many misconceptions and oversights exist. For example, assume that you implement hard disk redundancy to protect against disk failures. This doesn t protect against a power supply failure, so you choose to upgrade to a server that has redundant power supplies. You also place an uninterruptible power supply (UPS) on the circuit to prevent power problems external to the machine. Now, you have reasonably protected this machine against disk and power failures. But, what if a critical motherboard component or a disk controller fails As you can see, the list of things you need to protect against is a long one, and not all types of protection are practical. We ll cover all of these topics later in the book. Although hardware and software failures are very real possibilities that shouldn t be ignored, there are several other events you must protect against.
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Problems may occur by sheer accident. I gave an example earlier about how easy it might be to lose information in this Microsoft Word chapter file (and yes, I have made a backup since then). In many environments, accidental data loss is by far the most common type.
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Users and systems administrators, even with the best of intentions, sometimes make minor syntactical and procedural mistakes. Thankfully, features such as the Windows Recycle Bin can save us from some errors. Those annoying dialog boxes that constantly ask whether you re sure you want to perform an operation can save you a lot of time in the long run. But, for the most part, you operate without a safety net when you work in a networked environment. Can accidents involving the loss of data be prevented In some cases, the answer might be No. Accidents will occur due to lack of communication, inadequate training, and even physical mistakes. (Ever dropped coffee on a keyboard or accidentally rebooted a server ) However, you can take many measures to diminish the likelihood of these problems occurring. Best practices, such as managing security permissions and educating users, easily qualify as the ounce of prevention that may prevent the need for a pound of cure. In later chapters, we ll look at several ways to protect against good people who make bad mistakes.
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