Tape Handling and Storage Advantages
Magnetic tape storage and handling costs can be decreased when tape data capacity increases. Table 30 illustrates that the cartridge storage capacity of a 3490 subsystem is contrasted with available capacity improvements. As the compression ratio depends on dataset characteristics and the operating environment, three typical compression ratios (1:1, 2:1, and 3:1) are listed. Handling costs can also be reduced with the use of a cartridge stack loader, which can hold five cartridges. Further handling cost reductions are possible with a 3590 Model E11 or B11 drive that has an Automatic Cartridge Facility (ACF). The ACF can be loaded with 10 cartridges, excluding priority slots.
Table 30. Cartridge Capacity
| Capacity of a | Capacity of 5 | Capacity of 10 | |
Subsystem and Cartridge Selections | Single | Cartridges in | Cartridges in | |
| Cartridge | a Loader | an ACF | |
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| |
3490 subsystem with Cartridge System Tape | 0.2GB | 1.0GB | N/A | |
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|
| |
3490 subsystem with Cartridge System Tape | 0.4GB | 2.0GB | N/A | |
and IDRC ratio of 2 to 1 | ||||
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| |
3490 subsystem with Cartridge System Tape | 0.6GB | 3.0GB | N/A | |
and IDRC ratio of 3 to 1 | ||||
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| |
3490E subsystem with Cartridge System Tape | 0.4GB | 2.0GB | N/A | |
and IDRC ratio of 1 to 1 | ||||
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| ||
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| |
3490E subsystem with Cartridge System Tape | 0.8GB | 4.0GB | N/A | |
and IDRC ratio of 2 to 1 | ||||
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| ||
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| |
3490E subsystem with Cartridge System Tape | 1.2GB | 6.0GB | N/A | |
and IDRC ratio of 3 to 1 | ||||
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| ||
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| |
3490E subsystem with Enhanced Capacity | 0.8GB | 4.0GB | N/A | |
Cartridge System Tape and IDRC ratio of 1 to 1 | ||||
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| ||
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|
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| |
3490E subsystem with Enhanced Capacity | 1.6GB | 8.0GB | N/A | |
Cartridge System Tape and IDRC ratio of 2 to 1 | ||||
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| ||
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|
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| |
3490E subsystem with Enhanced Capacity | 2.4GB | 12.0GB | N/A | |
Cartridge System Tape and IDRC ratio of 3 to 1 | ||||
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| |
3590 Bxx model subsystem with IBM 3590 High | 10GB | N/A | 100GB | |
Performance Cartridge Tape uncompressed | ||||
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3590 Bxx model subsystem with IBM 3590 |
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| |
Extended High Performance Cartridge Tape | 20GB | N/A | 200GB | |
uncompressed |
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| |
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3590 Bxx model subsystem with IBM 3590 High |
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|
| |
Performance Cartridge Tape and a compression | 20GB | N/A | 200GB | |
ratio of 2 to 1 |
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3590 Bxx model subsystem with IBM 3590 |
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|
| |
Extended High Performance Cartridge Tape | 40GB | N/A | 400GB | |
and a compression ratio of 2 to 1 |
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| |
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3590 Bxx model subsystem with IBM 3590 High |
|
|
| |
Performance Cartridge Tape and a compression | 30GB | N/A | 300GB | |
ratio of 3 to 1 |
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823590 Operator Guide
