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night full dump, is wasteful because only a few files may have changed on the server. While this approach is standard among many backup programs, AMANDA introduces the concept of a dump cycle, which minimizes the total number of dumps performed by estimating the time taken to dump any particular file. It attempts to balance total backup times across different days, based on past performance of a particular device. While this feature is efficient, it may seem initially confusing to many administrators. Unfortunately, it is not possible to set up AMANDA in the traditional way, whereby a full dump is performed on weekends and incremental dumps are performed each weeknight, and this may be inappropriate for organizations that have a strict policy regarding backup scheduling. In addition, AMANDA has a further limitation in that it cannot back up a file system that is larger than the size of a single backup medium; for large disks (18GB and larger), AMANDA may be used only with the latest Digital Audio Tapes (DATs) and Digital Linear Tapes (DLTs), and not with quarter-inch cartridge (QIC) tapes or CD-R technology. While small drives and partitions can be backed up using these devices, it is obviously a limitation for organizations with large data-handling requirements.
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Legato s NetWorker storage management product is a commercial product that is often supplied with database server packages like Oracle. It is similar to AMANDA in that it prefers centralized over distributed control of all backup resources, in contrast to the VERITAS product, which is reviewed next. However, unlike AMANDA, multiple backup servers can exist as long as they are controlled by a central backup server. This approach was outlined in Figure 17-3. NetWorker is well known for its ability to back up data from and restore data to different clients, even those running different operating systems. This feature can be useful, for example, when you re upgrading client operating systems migrating from Linux to Solaris, because a complete reinstall of user packages and files is not necessary; they can be simply retrieved from a central NetWorker server. To make it easy for Windows and other PC users to integrate neatly within an enterprise server environment, Legato also supplies a Windows NT client, which is shown in Figure 17-4. For more information about Legato products, visit http://www.legato.com/.
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While AMANDA is focused on a single backup server that provides services to many clients, VERITAS provides a distributed backup management system, known as NetBackup, which can be used to process terabytes of data from many different clients across many different backup servers and multiple devices. This is similar to the approach outlined in Figure 17-3 and is aimed at maximizing the utilization of existing resources, such as tape drives and CD-R devices, no matter where they are located on a corporate intranet or even across the Internet. In addition, NetBackup provides the greatest amount
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of choices for clients, who can seamlessly manage their own backups across multiple hosts and devices. NetBackup also includes support for many server-side database systems, such as Oracle, dispensing with the need to perform separate warm dumps to backed-up files. NetBackup uses a set of storage rules on the server side to determine how files and data sources of various types are managed. These can be configured remotely by network administrators from any client that has access to the backup servers. VERITAS, like Legato, supplies several clients that make it easier for PC clients to operate within a larger storage management framework. Backup Exec is the VERITAS Windows NT client that can be used to back up local files to a remote server running NetBackup. Figure 17-5 shows the easy-to-use interface for the Backup Exec client. Similar to RAID, backup devices can be used concurrently to store data from different clients transparently through multiplexing; there is a logical separation between the client and what storage may be optimal with respect to the particular strengths and weaknesses of any one server. In addition, load can be balanced much more evenly across backup devices without concern for the capacity of any one particular drive. Thus, unlike AMANDA, it is easy to back up a single large partition using NetBackup. Further information about NetBackup can be found at http://www.veritas.com/.
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