Table Of Contents - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

Contents
1 Introduction ..................................................................................... 13
2 Concepts ........................................................................................ 15
Disk-based Backup and Virtual Tape Libraries ............................................................................... 15
Problems Addressed by Virtual Tape Libraries ......................................................................... 15
Integration of Disk in Data Protection Processes ...................................................................... 15
Where Virtual Tape Fits in the Big Picture ............................................................................... 16
HP VLS and D2D Portfolio ................................................................................................... 16
Typical VLS Environments ..................................................................................................... 17
Typical D2D Environments ................................................................................................... 17
What are the Alternatives? .................................................................................................. 18
Physical Tape .............................................................................................................. 18
NAS .......................................................................................................................... 18
Application-based Disk Backup ...................................................................................... 18
Business Copy ............................................................................................................. 19
Deduplication ........................................................................................................................... 20
Introduction ....................................................................................................................... 20
HP StorageWorks Deduplication Solutions ............................................................................. 20
Deduplication Ratios ........................................................................................................... 21
Target-based Deduplication ................................................................................................. 22
Tape Oversubscription ........................................................................................................ 23
Replication ............................................................................................................................... 23
Introduction to Replication ................................................................................................... 23
HP StorageWorks Replication Solutions ................................................................................. 24
Replication Deployment Options ........................................................................................... 26
Backup Application Interaction with Replication ...................................................................... 28
Replication Limitations ......................................................................................................... 29
3 Backup Solution Design Considerations ............................................... 31
Analyze the Existing Environment ................................................................................................ 31
Consider How you Want to Back Up your Data to the VLS or D2D ........................................... 31
Consider How you Want to Copy the Backup Data to an Off-site Location ................................. 33
Consider Speed and Ease of the Restore as well as the Backup ................................................ 33
Single Library vs. Multiple Libraries ............................................................................................. 33
Single Library .................................................................................................................... 33
Benefits of Single Library Systems ................................................................................... 34
Considerations for Single Library Systems ........................................................................ 34
Multiple Library .................................................................................................................. 35
Benefits of Multiple Library Systems ................................................................................ 35
Multiplexing, Multistreaming, and Multipathing ............................................................................ 36
Multiplexing ...................................................................................................................... 36
Multistreaming ................................................................................................................... 36
Multipathing ...................................................................................................................... 36
Blocksize and Transfer Size ........................................................................................................ 37
HP StorageWorks VLS and D2D Solutions Guide 3