barcode generator vb.net Developing the Data Protection Plan in Software

Encoder QR in Software Developing the Data Protection Plan

Developing the Data Protection Plan
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Database backups When you are dealing with database backups, several other considerations must be made. Relational database management systems (RDBMSs) such as SQL Server have transaction logs and typically use large files that must remain internally consistent. The overall concepts are the same backups can store either all information or just changes. We ll look at the details in later chapters.
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In choosing the types of backup operations to use, you must have a good understanding of the nature of the data you are protecting. For example, how much information changes per day Based on the capacity of the backup solution, how often will tape changes be required We ll put these items into perspective later in this chapter when we evaluate our information systems.
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Thus far, we ve looked at some of the different ways data can be protected from a management level. Now, it s time to discuss the issues associated with real-world hardware and software options. Evaluating data protection hardware and software solutions can be quite confusing. We won t be going into much technical detail in this chapter, though. We ll limit ourselves to the depth of information that is necessary to form a good data protection plan, and leave the details to 5, Evaluating Data Protection Solutions.
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The central concept behind performing backups is to move information into less expensive, removable forms of storage. Economy and efficiency are the objectives behind this idea. Backup hardware comes in many shapes and forms. Traditionally, when systems administrators heard the phrase backup and recovery, they thought tape drives. Tape-based media has many advantages and can meet business requirements. Several years ago, when hard drives were relatively expensive, tape backup units offered large storage capacities and good performance. Of course, there are tradeoffs: Tape media usually is not randomly accessible. Thus, if you need to access a piece of data in the middle of a tape, you may spend a large percentage of your time simply finding the data. Consequently, running applications or accessing data files regularly from tape is prohibitively slow.
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So far, we ve looked at several different methods of performing backups. Chances are good that more than one will apply to your environment. For example, developers workstations that contain large amounts of information might need to be backed up using local backup solutions, whereas a server farm would be a better scenario for a centralized solution. In many cases, the pros and cons of the potential solutions will make the decision obvious. In other cases, however, the scenario you choose will be based on time, administration, and technical constraints. With this in mind, let s move on to look at an overview of the technology available for accomplishing these tasks.
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Nowadays, hard disk space is cheap, and buying an additional drive can often provide the level of data redundancy needed as an adequate (though very cumbersome) solution for client machines. The large amounts of data normally stored on the server side, however, still requires tape devices (which have evolved incredibly in the last few years). These days, it s likely that more than one solution will fit an organization s data protection needs. The challenge has been reduced to making the best choice, instead of trying to find just anything that meets the goals. The details of the solutions will be based on the business s constraints and on technology. So, how can we choose the best hardware solution for backups We ll cover the specifics of various hardware solutions in 5. For now, know that the following issues will affect your data protection plan: w Backup capacity When shopping for backup hardware devices, you ll probably first look at the capacities of a potential solution. If you have about 20GB to back up, a very convenient choice will be a solution that can record this much information on a single piece of media. That way, you won t be stuck in the server room on a Friday evening, waiting to change tapes. Backup hardware vendors often use the assumption that your data will compress to half its normal size (a 2:1 ratio). This might occur for some types of data, but you should use better estimates. We ll look at some recommendations in later chapters. For now, keep in mind that a major factor in your decision will be how much data can be stored on a single piece of media. Backup speed Removable media drives can only transfer data up to a maximum rate. Factors that affect performance include the data transfer bus (such as SCSI buses) and the physical characteristics of the drive and the media. Depending on the volume of data to be backed up and the amount of time available for doing it, backup speed will play a role in finding the right solution. Hardware reliability The investment you make in backup hardware can be significant tape and other removable media solutions are not cheap! Almost all physical devices (especially those with moving parts) will fail at some point. It s important to consider how long the solution you have selected will last. Having tape devices fail can be quite costly, since you will need to immediately obtain a replacement and backups may be skipped. Vendors often cite statistics based on mean time between failures (MTBF). Use this as a guideline to determine the longevity and reliability of your solution. Shelf life of media The media used in removable storage drives has a finite lifespan. That is, tapes and other forms of media will eventually degrade to the point where data recovery is no longer possible. Although this might not be an issue for weekly backups, it s important when organizations attempt to store archived information for years. Generally, backup media is expected to last decades. This is usually long enough for allowing systems administrators to find another solution such as transferring all historical information to newer backup devices with larger capacities and more reliable media.
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