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In this configuration, multiple client machines hard drives are backed up to a central Solaris server, which can also be attached to multiple backup devices to provide various levels of redundancy for more- or less-significant data. For example, data from user PCs may not require the double or triple redundancy that financial records need. The freeware software product AMANDA, reviewed later in this chapter, is ideal for backing up multiple clients through a single server. In recent years, storage area networks (SANs) have been employed to solve wide area storage problems. In a SAN, backup management and data storage is distributed across multiple backup hosts and devices. Thus, a client s data could potentially be stored on many different backup servers, and management of that data could be performed from a remote manager running on the client. This configuration is shown in Figure 17-3. For example, a VERITAS client for Windows called Backup Exec can connect to many different Solaris servers through a Server Message Block (SMB), backing up data to multiple mediums. Other server-side packages, such as Legato NetWorker, offer distributed management of all backup services. Both products are reviewed later in this chapter. New to the game are Sun s Java-based Jiro and Jini technologies, which implement the proposed Federated Management Architecture (FMA) standard. FMA is a proposal
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for implementing distributed storage across networks in a standard way, and it is receiving support from major hardware manufacturers such as Hitachi, Quantum, VERITAS, and Fujitsu for future integration with their products. More information on Jiro and FMA can be found at http://www.jiro.com/.
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If you want to use anything other than the standard UNIX backup tools, many freeware and commercial packages are available, depending on what facilities you require. For example, the AMANDA freeware program centralizes the storage and control for backup and restore of remote machines. However, it does not support distributed storage, in which the two commercial vendors, VERITAS Software and Legato Systems, specialize. VERITAS Software and Legato Systems are far and away the leading vendors in the automated enterprise-wide backup and restore application arena, since they provide failover and clustering capabilities along with backup and restore.
AMANDA
AMANDA, the Advanced Maryland Automatic Network Disk Archiver, is a backup system that follows the scheme of using a centralized backup server for multiple clients, shown previously in Figure 17-2. It can back up client drives from any operating system that supports SMB, including Solaris, Linux, and Windows NT clients. Although AMANDA was designed to operate with a single tape drive, it can be configured to use multiple tape drives and other backup devices. One advantage of AMANDA over other backup systems is that it provides management of native Solaris backup and restore commands; this means that AMANDA backup files are tar files that can be manually extracted and viewed without using the AMANDA system if it is not available for some reason. This is particularly significant for full dumps that must be restored to a green fields server that does not yet have AMANDA installed. AMANDA can be downloaded from http://www.amanda.org, and answers to questions are available at http://amanda.sourceforge.net/fom-serve/ cache/1.html. The AMANDA approach to backups is a solution based on cron scheduling of tar commands: It has an efficient scheduling and storage management system that involves spooling both incremental and full dumps to a holding disk on the backup server. The data is not written directly to the backup device, so a better logical separation exists between the preparation of backup files and the actual recording process. This separation is particularly important when using CD-R (CD-recordable) technology, because of the buffer overrun problem: If data is not made available to the CD-R device quickly enough, it fails to write a track, and the disc is wasted because data cannot be rewritten to it. If the backup file is prepared in advance on the holding disk, most of the overhead involved in copying the backup file to the backup device is removed. AMANDA s other advantage is its efficient scheduling of dumps to the backup device. Simply performing an incremental dump each night, followed by a Sunday
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