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In this chapter, you have examined how to implement advanced file system repair and integrity checking, and how to configure RAID. Most enterprise systems use RAID to ensure high availability, especially in a shared disk environment.
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oftware and hardware failures are an unfortunate fact of life in the IT industry, and panic can result when missing or corrupt data is revealed during a peak service period. However, a system crash or a disk failure should not be a cause for alarm: instead, it should be the signal to a well-armed and well-prepared administrator to determine the cause of the problem, rectify any hardware faults, and restore any lost data by using a recovery procedure. This general procedure can be followed regardless of whether user files or database tables have been lost or corrupted. Fortunately, Solaris provides a wide variety of backup and restore software that can be used in conjunction with any number of media for example, magnetic and digital audio tapes, writeable CD-ROMs, DVDs, and redundant hard drives. This chapter examines the development and implementation of snapshot, backup and recovery procedures with Solaris and reviews some of the popular backup and recovery freeware and commercial tools.
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The following concepts are required knowledge for implementing efficient backup and recovery services.
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In many company networks, valuable data is stored on Solaris server systems in user files and database tables. The variety of information stored is endless: personnel files, supplier invoices, receipts, and all kinds of intellectual property. In addition, many organizations provide some kind of service that relies on server uptime and information availability to generate income or maintain prestige. For example, if a major businessto-consumer Web site like Amazon.com or business-to-business hub like Office.com experiences downtime, every minute that the system is unavailable costs money in lost sales, frustrated consumers, and reduced customer confidence. On the other hand, a government site such as the Government Accountability Office (http://www.gao.gov/) provides valuable advice to government, business, and consumers, and is expected to
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Part IV:
Managing Devices
be available continuously. The reputation of online service providers can suffer greatly if servers go down. It is not enough, however, to ensure that a service is highly available; the data it provides also needs to be valid, which is why regular data backup needs to occur. On a smaller scale, but just as significant, is a department server, which might provide file serving, authentication services, and print access for several hundred PC systems or Sun Rays. If the server hard disk crashes, the affected users who can t read their mail or retrieve their files are going to be inconvenienced if system data cannot be restored in a timely fashion. This chapter examines the background and rationale for providing a reliable backup and restore service that will ensure a high level of service provision, even in the event of hardware failure.
Analyzing Backup Requirements
The first requirement of a backup service is the ability to restore a dysfunctional system to a functional state as quickly as possible. The relationship between time of restoration and user satisfaction is inverse, as shown in Figure 17-1: the longer a restore takes, the angrier users will become, while the rapid restoration of service will give users confidence. For this reason, many sites take incremental backups of their complete file systems each night but may take a weekly full dump snapshot that can be used to rapidly rebuild an entire system from a single tape or disk. The second requirement for a backup service is data integrity: it is not sufficient just to restore some data and hope that it s close enough to the original. It is essential that all restored data actually be usable by applications as if no break in service had occurred. This is particularly important for database applications that may have several kinds of files associated with them. Table indices, data files, and rollback segments must all be
FIGURE 17-1
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