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In addition to the speed of the tape drive, you ll want to consider the performance of the bus on which the tape drive runs. Earlier in this chapter, we looked at a comparison of IDE vs. SCSI buses for running server hard disks. Drives also support a variety of hardware interfaces, with a wide range in performance and usability characteristics. For example, although parallel ports are the slowest method, they enable you to easily move
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tape drives between systems. The IDE interface supports internal drives only and is the standard in most desktop systems. SCSI devices are the best choice for mainstream servers and support both internal and external devices. Other technologies, such as fiber channel buses, are available for even higher throughput requirements. Table 5-6 compares the maximum speeds attainable by a number of these products. Ethernet speeds and characteristics were included for comparison, although no tape backup devices exist that connect directly to Ethernet ports.
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Notes Networks can be divided via switches and routers to allow more devices per subnet. Networks can be divided via switches and routers to allow more devices per subnet. Networks can be divided via switches and routers to allow more devices per subnet. Fast throughput bus over large distances (up to 500m). Serves as a high-speed multipurpose bus for external devices.
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Fast Ethernet
100MB/sec Unlimited
Gigabit Ethernet
1000MB/sec Unlimited
Fibre Channel FireWire (IEEE 1394)
100MB/sec Determined by device capability 25MB/sec Many (based on the (controller controller) speed; device speeds may vary) 66MB/sec Two per IDE channel. (Most PCs have two built-in channels.) ~600KB/sec Devices can be daisy-chained. A Comparison of Bus Speeds and Characteristics
There are several different specifications for IDE bus throughput. Widespread support; good choice for portability.
Parallel port
Table 5-6.
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Bus Technology SCSI
Maximum Speed 80MB/sec
Devices per Bus Seven per channel (including the controller). Multiple channels per adapter are available, and multiple adapters can be used on a single system. Many devices can be supported through the use of hubs and daisy-chaining.
Notes There are several SCSI specs. (See Table 5-2.)
Universal serial bus (USB)
Up to 12MB/sec
USB is targeted as a replacement for other device attachment methods, including serial ports, keyboard connectors, MIDI/game ports, and parallel ports; device support is currently available only on Windows 98 and Windows 2000.
Table 5-6.
A Comparison of Bus Speeds and Characteristics (continued)
Again, as with any technology, you should verify real-world performance with vendors. For example, buses may support extremely high throughput, but other conditions may prevent actually attaining those levels of performance. A good example is Ethernet. For various reasons, it is difficult to achieve speeds close to the full 10MB/sec speed that is claimed. Impacts are at least as great for Fast Ethernet and Gigabit Ethernet technologies. Doing adequate research before you select your data buses will go a long way toward ensuring the success of your backup solution.
Media Options
Most tape drives are described relative to the types of media they support. The type of media has significant impact on the storage capacity and performance of the device. When you re weighing your media options, there are several factors to consider: w Capacity Does the media hold a reasonable amount of data With removable drives, you can always use multiple sets of media, but it is much more convenient and practical to have the majority of information fit on one storage unit.
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Durability If tapes will be handled regularly (for example, by computer operators), it s important to consider their durability. Does the cartridge or media protect against accidental exposure of sensitive components Is the cartridge suitable for physically sending across the country or internationally (via postal carriers) Cost How expensive is the media Although the cost of the tapes and other removable cartridges might seem cheap, keep in mind that this will be a recurrent expense for your organization. A good way to evaluate relative expenses is by measuring cost per megabyte. For example, a tape might hold 1.6GB (~1,600MB) of data and cost $30. This would result in a cost per megabyte of approximately 1.8 cents. Keep in mind, however, that the initial pricetag is only one consideration among many, and that the cheapest solutions might have very costly drawbacks. Active life How often can the media be used before it must be replaced If you will be regularly reusing tapes, for example, for how long can you rely on them before they must be replaced Usually, active life estimates will be stated based on hours of use. Shelf life It may not be something you look at first, but the shelf life of the media you select is extremely important to consider. In many cases, magnetic media and optical storage are designed to survive for decades. You increase this life span by storing the media in a controlled environment. Also, you shouldn t worry too much about the fact that the media won t last forever; at some point you ll need to upgrade your backup solution, and that will probably involve migrating a lot of your data to new media.
Based on these criteria, there are several different types of media from which you can choose. In the past, a backup device was almost decidedly a tape drive. Magnetic media is reliable and inexpensive. It also has a longer shelf life than some of the alternatives. However, recent advances in technology have increased the variety of dependable backup equipment. Table 5-7 lists various types of backup drives and their characteristics. (The capacities indicated are for uncompressed data.)
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