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Appendix B: Understanding RAID ● 94
RAID 6 Arrays
A RAID 6 array—also known as dual drive failure protection—is similar to a RAID 5 array
because it uses data striping and parity data to provide redundancy. However, RAID 6 arrays
include two independent sets of parity data instead of one. Both sets of parity data are striped
separately across all disk drives in the array.
RAID 6 arrays provide extra protection for your data because they can recover from two
simultaneous disk drive failures. However, the extra parity calculation slows performance
(compared to RAID 5 arrays).
RAID 6 arrays must be built from at least four disk drives. Maximum stripe size depends on
the number of disk drives in the array.
RAID 60 Arrays
Similar to a RAID 50 array (see page 93), a RAID 60 array—also known as dual drive failure
protection—is built from eight disk drives configured as two or more RAID 6 arrays, and
stripes stored data and two sets of parity data across all disk drives in both RAID 6 arrays.
Two sets of parity data provide enhanced data protection, and striping improves performance.
RAID 60 arrays also provide high data transfer speeds.
Disk Drive 1
Disk Drive 2
Disk Drive 3
Disk Drive 4
250 GB
250 GB
400 GB
400 GB
Drive Segment Size
(Smallest Disk Drive)
Disk Drive 2
Disk Drive 3
Disk Drive 4
Disk Drive 1
1 P1 ... P2
2 P2 ... 449
P1 3 ... P1
P2 4 ... 500
Unused Space = 150 GB
Disk Drives in Logical Drive Based on the drive segment sizes used:
RAID 6 Logical Drive = 500 GB plus
parity (P1 & P2)
Unused Space = 150 GB
- Installation and User’s Guide 1
- Copyright 2
- Trademarks 2
- Disclaimer 2
- Contents 7
- 4 Getting Started 8
- 6 Creating a Bootable Array 8
- 9 Managing Your Storage Space 9
- 10 Solving Problems 9
- A Introduction to SAS 9
- B Understanding RAID 10
- F Safety Information 11
- G Technical Specifications 11
- About This Guide 12
- How to Find More Information 13
- Kit Contents and System 14
- Requirements 14
- Kit Contents 15
- DVD-ROM drive 16
- About Your RAID Controller 17
- Array-level Features 18
- Adding a Flash Backup Module 19
- About the Adaptec RAID 5085 20
- About the Adaptec RAID 5405 21
- About the Adaptec RAID 5445 22
- About the Adaptec RAID 51245 24
- About the Adaptec RAID 51645 25
- About the Adaptec RAID 52445 26
- About the Adaptec RAID 5405Z 27
- About the Adaptec RAID 5445Z 28
- About the Adaptec RAID 2045 30
- Adaptec RAID 2405/2405Q 31
- About the Adaptec RAID 2805 32
- About the Adaptec RAID 6405 33
- About the Adaptec RAID 6445 34
- About the Adaptec RAID 6805 35
- About the Adaptec RAID 6405E 36
- About the Adaptec RAID 6805E 37
- Getting Started 38
- Choosing a RAID Level 39
- Disk Drives 40
- Installation Options 41
- Basic Installation Steps 42
- In this chapter 43
- Installing the Controller 44
- Connecting External Devices 50
- Next Steps 50
- Creating a Bootable Array 51
- Setting the Boot Controller 52
- Creating an Array 52
- Making Your Array Bootable 55
- Installing the Driver and an 56
- Operating System 56
- Creating a Driver Disk 57
- Installing with Windows 58
- Installing with SuSE Linux 60
- Installing with OpenServer 62
- Installing with UnixWare 63
- Installing with Solaris 63
- Installing with VMware 63
- Installing with FreeBSD 64
- Installing on Windows 68
- Installing on OpenServer 69
- Installing on UnixWare 69
- Installing on Solaris 70
- Installing on VMware 70
- Installing on FreeBSD 71
- Managing Your Storage Space 72
- About Adaptec Storage Manager 73
- Which Utility Should I Use? 74
- Solving Problems 75
- Failed Device is faulty On 76
- Other No error Off 76
- Resetting the Controller 78
- Introduction to SAS 80
- What is SAS? 81
- What’s a Phy? 82
- What’s a SAS Port? 83
- What’s a SAS Address? 83
- What’s a SAS Connector? 83
- What do SAS Cables Look Like? 83
- Direct-attach Connections 84
- Backplane Connections 84
- SAS Expander Connections 85
- Understanding RAID 87
- Understanding Drive Segments 88
- Non-redundant Arrays (RAID 0) 88
- RAID 1 Arrays 89
- RAID 1 Enhanced Arrays 89
- RAID 10 Arrays 90
- RAID 5 Arrays 91
- RAID 5EE Arrays 92
- RAID 50 Arrays 93
- RAID 6 Arrays 94
- RAID 60 Arrays 94
- Selecting the Best RAID Level 95
- Using the Adaptec RAID 96
- Configuration Utility 96
- Running the ARC Utility 97
- Managing Existing Arrays 98
- Initializing Disk Drives 99
- Rescanning Disk Drives 99
- Secure Erasing Disk Drives 100
- Managing Global Hot Spares 100
- Creating a New JBOD 100
- Managing Existing JBODs 101
- Opening SerialSelect 102
- Applying Changes and Exiting 102
- Power Management Settings 103
- Locating Disk Drives 104
- Identifying Disk Drives 105
- Viewing the Event Log 106
- System Requirements 108
- Before You Begin 108
- Running the Menu-based AFU 109
- Running the 110
- Quick Reference 114
- 22-55-2161 115
- Pin Number 115
- Specification 117
- Connector Specification 120
- J5 Pin Number Signal 122
- 2258500-R ASR-51645 RoHS Kit 124
- J4 Pin Number Signal 130
- Safety Information 137
- Technical Specifications 138
- Environmental Specifications 139
- DC Power Requirements 139
- Current Requirements 139
- Index ● 141 141
- Index ● 142 142
- Index ● 143 143
- Index ● 144 144
- PMC-Sierra, Inc 145
- 1380 Bordeaux Drive 145
- Sunnyvale, CA 94089 USA 145
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