Contents
1 Introduction
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8
2 Concepts
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9
Disk-based Backup and Virtual Tape Libraries
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9
Problems Addressed by Virtual Tape Libraries
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9
Integration of Disk in Data Protection Processes
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9
Where Virtual Tape Fits in the Big Picture
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9
HP VLS and D2D Portfolio
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10
Typical VLS Environments
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11
Typical D2D Environments
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11
What are the Alternatives?
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12
Physical Tape
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12
NAS
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12
Application-based Disk Backup
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12
Business Copy
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13
Deduplication
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14
Introduction
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14
HP Deduplication Solutions
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14
Deduplication Ratios
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15
Target-based Deduplication
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16
Tape Oversubscription
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16
Replication
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17
Introduction to Replication
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17
HP Replication Solutions
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17
Replication Deployment Options
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20
Backup Application Interaction with Replication
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22
Replication Limitations
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23
3 Backup Solution Design Considerations
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24
Analyze the Existing Environment
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24
Consider How you Want to Back Up your Data to the VLS
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24
Consider How you Want to Copy the Backup Data to an Off-site Location
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26
Consider Speed and Ease of the Restore as well as the Backup
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26
Single Library vs. Multiple Libraries
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26
Single Library
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Benefits of Single Library Systems
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27
Considerations for Single Library Systems
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27
Multiple Library
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28
Benefits of Multiple Library Systems
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Multiplexing, Multistreaming, and Multipathing
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29
Multiplexing
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29
Multistreaming
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29
Multipathing
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29
Blocksize and Transfer Size
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30
LAN-free Backups
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30
Retention Planning
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30
Future Data Growth
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31
Considerations for Copies
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31
Copy to Physical Tape through the Backup Application
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31
Media Server Considerations
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32
Benefits of Copying to Physical Tape through the Backup Application
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33
Considerations for Copying to Physical Tape through the Backup Application
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33
Contents
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