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Table of Contents
About This Document ........................................................................................................9
Intended Audience.................................................................................................................................9
New and Changed Documentation in This Edition...............................................................................9
Publishing History..................................................................................................................................9
Document Organization.........................................................................................................................9
Typographical Conventions..............................................................................................................9
Related Documents.................................................................................................................................9
HP Encourages Your Comments............................................................................................................9
1 Introduction to RAID Technology................................................................................11
What is RAID?......................................................................................................................................11
The RAID Concept...........................................................................................................................11
Physical Disks and Logical Drives..................................................................................................12
Performance and Data Redundancy.....................................................................................................13
Increasing Logical Drive Performance............................................................................................13
Protecting Data With Fault Tolerance and Spare Disks..................................................................14
2 Smart Array Controller Supported RAID Configurations.........................................15
RAID 0: No Fault Tolerance..................................................................................................................15
RAID 1: Disk Mirroring........................................................................................................................15
RAID 1+0: Disk Mirroring and Striping...............................................................................................16
RAID 5: Distributed Data Guarding.....................................................................................................17
RAID ADG: Advanced Data Guarding................................................................................................17
Summary of RAID Methods.................................................................................................................19
Choosing a RAID Method....................................................................................................................19
A Logical Drive Failure Probability.................................................................................21
RAID Level and Probability of Drive Failure.......................................................................................21
Glossary............................................................................................................................23
Index.................................................................................................................................25
Table of Contents
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