onbarcode.barcode.winforms.dll free download Maintaining Server Availability in VB.NET

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Maintaining Server Availability
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Many magnetic tape formats are suitable for backups. Table 6-1 lists some of these formats. The general rule of magnetic tape drives is that you trade speed and capacity for cost. The best drives on the market can hold up to 200 gigabytes on a single tape, and write data at speeds of nearly 60 megabytes per second. For a drive like this, however, you can easily pay $5,000 or more. Slower drives with lower media capacities can be much less expensive.
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Table 6-1
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Tape Width Cartridge Size Capacity (uncompressed) Speed 600 MB/min
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Type
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.25 inch Quarter-inch cartridge (QIC), Travan Digital audio tape (DAT) 8 mm Digital linear tape (DLT), Super DLT Linear Tape-Open (LTO), Ultrium 4 mm 8 mm .50 inch
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4 6 0.625 inches (data 50 GB cartridge); 3.25 2.5 0.6 inches (minicartridge) 2.875 2.0625 0.375 inches 3.7 2.44 0.59 inches 4.16 4.15 1 inches 20 GB 100 GB 160 GB
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360 MB/min 1,400 MB/min 960 MB/min
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.50 inch
4.0 4.16 0.87 inches
200 GB
3,600 MB/min
Real World
Magnetic Tape Compression
Virtually all magnetic tape drives support hardware compression, which means that a drive compresses all data before writing it to the tape. This is why most tape drive manufacturers are careful to mention the compressed and uncom pressed capacities of their products. Drive manufacturers all use the traditional ratio of 2:1 when describing the compressed capacities of their drives. However, the actual compression ratio you achieve depends on the type of data you are backing up. Executables and other application files do generally compress at approximately a 2:1 ratio. However, some file types, such as uncompressed bitmap graphics, compress at a much higher rate, such as 8:1, meaning that you can fit even more on a tape. On the other hand, when you are backing up files that are already compressed, such as .jpg images, .mpg audio files, and .zip archives, the drive cannot compress them any more, so the ratio for these files is 1:1. For organizations with an enormous amount of data to back up, there are also devices on the market called autochangers or tape libraries. An autochanger combines one or more magnetic tape drives with a robotic mechanism that inserts tapes into drives and removes them. Autochangers range from small desktop devices with one drive that
Lesson 3
Planning a Backup Strategy
6-33
hold a handful of tapes, to huge units the size of a refrigerator, with several drives and holding hundreds of tapes. The advantage of an autochanger is that you can create a single unattended backup job that spans multiple tapes. When the first tape is full, the autochanger removes it from the drive and inserts a new one, repeating the sequence until the job finishes. With a large autochanger, network administrators can sometimes go for weeks or months without having to swap tapes in and out of the device, while their backups proceed automatically every night.
As with high-end tape drives, the prices of autochangers can be shockingly high. A ten-drive LTO unit holding 100 tapes can easily cost $75,000 or more.
Off the Record
Real World Media Costs
When evaluating backup hardware, cost is always important. However, in addition to the cost of the drive itself, you must also consider the media costs. You might be able to purchase a drive at what seems to be a bargain price, only to discover that the cost of the media makes the solution more expensive than a higher-priced drive. The traditional method of evaluating storage media costs is to divide the price of one storage device (such as a tape) by the number of megabytes it holds, which tells you the medium s cost per megabyte. However, with storage capacities constantly increasing and media costs decreasing, it is now often more practical to compute the cost per gigabyte.
Backup Software
A backup software product is an application that enables you to select the files you want to back up and sends them to the backup drive. Most backup software also includes features that enable you to create repeating backup jobs and schedule them to occur regularly. The usual objective of a network administrator is to create a backup solution that requires as little intervention as possible. With a properly configured hardware and software combination, daily backups should occur with the administrator doing nothing but swapping tapes in and out of the drive. The backup software must also provide a way to restore data from the backup tapes. When the software backs up data, it creates a catalog of the files it processes, so that you can locate specific data for restoration. You can usually choose individual files for restoration, or restore entire drives, in the case of a disaster.
Off the Record The difference between various backup software products is usually in the extra features that the application includes. Most tape drives come with a rudimentary backup program that gets the job done, but offers few of the extra features needed by most network backup administrators.
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