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Before you can begin to plan for recovering information, you should be able to envision the various scenarios in which data loss might occur. In some cases, you might experience the complete loss of a server due to a serious hardware failure. In others, it might be just a few files or a database table that must be restored from tape. In any case, you ll want to make sure you understand the issues related to restoring information, before you are forced to do so under pressure. In this section, we ll look at various scenarios in which data loss might occur, and provide an overview of some potential solutions.
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When speaking of data recovery, the scenario that people seem to think of most often is the event of a complete data loss or system failure. Although it could happen, such an event is much more rare than accidental data deletion. Nevertheless, it s important to decide what to do in this worst-case scenario before it occurs. Generally, when a hardware failure occurs, a server or workstation can no longer function as required for daily operations. Hardware failures might involve components, such as power supplies, hard disks, network cards, or motherboards, or they might involve an environmental problem, such as the loss of a router, making one or more servers inaccessible. The same symptoms may have different causes and will require different actions to resolve. Some general best practices related to dealing with hardware failures include the following: w Provide for redundancy. In earlier chapters, we talked about ways to protect data through redundancy. For example, RAID technology and multiple power supplies can prevent common failures. When implementing redundant hardware, it s important to keep in mind which failures you will be protected against. If downtime is not an option, then you might want to choose a clustering solution. This will protect against hardware failures of the servers themselves, but if the machines are located on the same network, a router failure may cause both servers to be unavailable. Of course, you can protect against this by providing multiple routes to the servers, but it takes additional planning. Even with that level of protection, a physical disaster will cause downtime. Keep spares. To the extent your business requirements and budget permit, you will probably want to keep spare hardware available. Although redundancy can protect against many problems, some problems might require an entire server replacement. If, for example, a motherboard component fails, you can simply remove the hard disks from the failed machine and place them in another one. Be sure that the hardware is exactly the same, since differences as minor as network card revisions can require driver changes. Enter into a maintenance contract. Most major manufacturers of hardware provide a service or maintenance contract. In the event of a failure, parts replacements can be made under the contract. Based on the level of support provided, this might involve a technician visiting onsite to repair failed machines or the shipping of a replacement part. It is important to fully understand the terms of a service-level agreement when it comes to support and maintenance contracts. There are few things worse than finding out that 24-hour support only applies on weekdays or that parts are not guaranteed to be in stock.
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By implementing these best practices, you can ensure that when hardware failures occur, you ll be able to deal with them appropriately.
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One problem that may occur due to a hardware or software failure is the inability to boot the server. Troubleshooting the problem can be quite difficult, because you can t even access a console on the local machine. There are, however, several ways to fix your system when such problems occur. The first step in resolving the problem is to determine what has occurred. In some cases, the problem might be the overwriting of the boot sector on the hard drive. In others, however, much more widespread data corruption or hardware failures may have occurred. The general process to restore a server from backups involves the following steps: 1. Replace the failed hardware (if necessary). 2. Reconfigure disk devices (if necessary). If you re using RAID, multiple partitions, or other disk configurations, you may be required to repartition your disks prior to reinstalling the operating system. 3. Reinstall the operating system. 4. Reinstall all software and drivers required to access the backup device (usually only necessary for tape backups). 5. Fully restore the operating system and any data that has been lost. 6. Test the restoration. Following a reboot of the operating system, you should test your server to ensure that it is working. The preceding operations probably seem like a lot of time-consuming work. Make no mistake, they are! However, based on your business requirements, it might be acceptable. Later in this chapter, we ll look at ways in which you can plan for and manage the time required to restore database information.
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