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Best Use Workstation backups Server and workstation backups
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Table 5-7.
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A Comparison of Media Capacities
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SQL Server 7 Backup & Recovery
Drive Type Advanced Intelligent Tape (AIT) CD-ROM writers
Capacity 25+GB
Speed Fast (6MB/sec)
Best Use Workgroup/ enterprise backups Frequently accessed archives; SW distribution Frequently accessed archives Enterprise backups
Notes Good cost and performance; a good solution for large backup environments. Media can be written to only once. Compatible with most read-only CD-ROM drives. Rewritable media. Incompatible with older CD-ROM drives. Good cost and performance characteristics; a good solution for large backup environments. Technology and standards are still emerging. Cost per megabyte is low.
650MB
Slow (~900K/sec)
CD-RW (CDrewritable) Digital Linear Tape (DLT)
650MB
Slow (~900K/sec) Fast (3MB/sec)
70+GB
DVD-RAM
5GB to 17GB
At least 500K/sec
PCs and workstations; long-term archiving and data distribution PCs, workstations, or small servers Workstation backups
Jaz drives
1GB to 2GB
Slow to medium (varies based on data bus) Medium (~1MB/sec)
Although product is readily available in many PCs, cost per megabyte is relatively high. Drives and media are inexpensive.
QuarterInch Cartridges (QIC) Zip drives
Up to 4GB
100MB to 250MB
Slow to medium (varies based on data bus)
PCs or workstations
Although product is readily available in many PCs, cost per megabyte is relatively high.
Table 5-7.
A Comparison of Media Capacities (continued)
5:
Evaluating Data Protection Solutions
NOTE: Always determine whether storage capacities for selected tape devices and media are based on compressed or actual data capacities. Most vendors will advertise devices and media that store 4GB of data as 4GB (uncompressed) / 8GB (compressed). The assumed compression ratio of 2:1 is wishful thinking in most real-world scenarios. When you re deciding upon an appropriate system, consider the type of data you ll be backing up. Text and data files will generally compress very well, but program files and other binary files will normally not achieve a 2:1 compression ratio.
Advanced Backup Solutions
There are several additional options that might fill some of the gaps left by standard backup solutions. Here s a partial list: w Tape striping As with disk striping (RAID), tape striping can greatly increase backup performance by storing data using two or more backup drives. Depending on the backup methodologies used, the tape drives can be used in parallel for both backup and recovery operations, thereby reducing the amount of time used in these operations. Media changers/autoloaders If you ve ever felt that switching tapes is a perfect job for robots, you re not alone! Robotic media changes can be used to automatically feed media to drives based on a predefined schedule. They won t complain about the tedious tasks you force them to do, and they can be quite reliable. This can be a great solution if your backups don t fit on a single piece of media. However, autoloaders can be expensive (at least in the short term), and must still be set up and managed carefully to ensure that the proper tapes are being used. On-demand recovery A common procedure in many businesses is for an employee to call the help desk and initiate a request for file restoration. If such requests are rare, they are easy to manage through a manual process. For larger organizations, however, much time can be spent recovering user files. Some tape backup solutions allow users to automatically request files for restoration. Although the user must still wait while the files are accessed from the appropriate media, the process is automated and does not require the time of the help desk personnel or systems administrators. On-demand recovery options work especially well with media changers.
In evaluating backup hardware, you re likely to find many other features that will be helpful. One example is cleaning indicators on tape drives that periodically remind systems administrators to insert a cleaning tape. (These tapes can clean the physical heads on the device, and can prolong the accuracy of read and write operations.) All of these features are likely to be useful, but it is up to you to determine whether or not they are worth the cost and are relevant to your business environment.
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