Adaptec SAS/SATA/SCSI RAID Controllers Manuel d'utilisateur Page 76
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Appendix B: Understanding RAID ● 76
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 75), 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.
Note:
Because they support four disk drives only, the Adaptec 2420SA RAID controller can’t
support RAID 60 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
- Adaptec Customer Support 3
- Canadian Compliance Statement 5
- Contents 6
- Safety Information 10
- Technical Specifications 10
- About This Guide 11
- How to Find More Information 12
- Kit Contents and System 13
- Requirements 13
- Kit Contents 14
- System Requirements 14
- About Your RAID Controller 15
- Array-level Features 16
- Adding Enhanced Features 17
- About the Adaptec 4000 18
- About the Adaptec 4800SAS 19
- 256 MB also available 19
- About the Adaptec 4805SAS 20
- About the Adaptec 2420SA 21
- About the Adaptec 2820SA 22
- About the Adaptec 2130SLP 23
- About the Adaptec 2230SLP 24
- Getting Started 25
- Choosing a RAID Level 26
- Selecting Disk Drives 27
- Selecting Cables 28
- SATA Cables 29
- SCSI Cables 29
- Installation Options 30
- Basic Installation Steps 30
- In this chapter 31
- Before You Begin 32
- Installing the Controller 32
- Connecting External Devices 35
- Next Steps 36
- Creating a Bootable Array 37
- Setting the Boot Controller 38
- Creating an Array 38
- Making Your Array Bootable 41
- Installing the Driver and an 42
- Operating System 42
- Creating a Driver Disk 43
- Installing with Windows 44
- Installing with Red Hat Linux 44
- Installing with SUSE Linux 45
- Installing with NetWare 45
- Installing with OpenServer 46
- Installing with Solaris 46
- Installing with UnixWare 47
- Installing with VMWare 47
- Installing with FreeBSD 47
- Installing on Windows 51
- Installing on NetWare 51
- Installing on OpenServer 52
- Installing on Solaris 52
- Installing on UnixWare 53
- Installing on VMWare 53
- Installing on FreeBSD 53
- Managing Your Storage Space 55
- About Adaptec Storage Manager 56
- Which Utility Should I Use? 57
- Solving Problems 58
- Troubleshooting Checklist 59
- Silencing the Alarm 59
- Resetting the Controller 61
- In this appendix 62
- ) Web site at www.scsita.org 62
- What is SAS? 63
- What’s a Phy? 64
- What’s a SAS Port? 65
- What’s a SAS Address? 65
- What’s a SAS Connector? 65
- What do SAS Cables Look Like? 65
- Direct-attach Connections 66
- Backplane Connections 66
- SAS Expander Connections 67
- Understanding RAID 69
- Understanding Drive Segments 70
- Nonredundant Arrays (RAID 0) 70
- RAID 1 Arrays 71
- RAID 1 Enhanced Arrays 71
- RAID 10 Arrays 72
- RAID 5 Arrays 73
- RAID 5EE Arrays 74
- RAID 50 Arrays 75
- RAID 6 Arrays 76
- RAID 60 Arrays 76
- Selecting the Best RAID Level 77
- Using the Adaptec RAID 78
- Configuration Utility 78
- Running the ARC Utility 79
- Managing Existing Arrays 80
- Initializing Disk Drives 80
- Rescanning Disk Drives 80
- Secure Erasing Disk Drives 81
- Opening a -Select Utility 81
- Applying Changes and Exiting 81
- General Controller Settings 82
- Option Description 83
- Viewing the Event Log 85
- Running the ACU Using Scripts 88
- About Record Mode 89
- Required 90
- ? Description 90
- HotspareDrives=0:0:0,0:1:0 91
- Type=Volume 91
- Type=RAID1 91
- ACU exits with an error 92
- Keyword Description 93
- ACU Error Codes 94
- Sample Scripts 95
- Running the Menu-based AFU 99
- Running the 100
- Electrostatic Discharge (ESD) 104
- Environmental Specifications 106
- DC Power Requirements 106
- Current Requirements 106
- Index ● 108 108
- Index ● 109 109
- Index ● 110 110
- Index ● 111 111
- Adaptec, Inc 112
- 691 South Milpitas Boulevard 112
- Milpitas, CA 95035 USA 112
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