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Appendix B: Understanding RAID ● 81
RAID 1 Arrays
A RAID 1 array is built from two disk drives, where one disk drive is a
mirror of the other (the same data is stored on each disk drive).
Compared to independent disk drives, RAID 1 arrays provide improved
performance, with twice the read rate and an equal write rate of single
disks. However, capacity is only 50 percent of independent disk drives.
If the RAID 1 array is built from different- sized disk drives, the free
space, drive segment size is the size of the smaller disk drive, as shown
below.
D
isk Drive 1
D
isk Drive 2
250 GB
400 GB
Disk Drives in Logical Drive
Disk Drive 1
Disk Drive 2
RAID 1 Logical Drive = 250 GB
Not Used
Unused Space: 150 G
B
1 – 250
1 – 250
Drive Segment Size (Smaller Disk Drive)
- SAS, SATA, and SCSI 1
- RAID Controllers 1
- Copyright 2
- Trademarks 2
- Disclaimer 2
- Adaptec Customer Support 3
- Canadian Compliance Statement 6
- Contents 7
- 6 Creating a Bootable Array 8
- 9 Managing Your Storage Space 9
- 10 Solving Problems 9
- B Understanding RAID 10
- D Using the ACU for DOS 11
- F Safety Information 11
- G Technical Specifications 11
- About This Guide 12
- How to Find More Information 14
- Kit Contents and 15
- System Requirements 15
- Kit Contents 16
- About Your RAID 18
- Controller 18
- Array-level Features 19
- Adding Enhanced Features 20
- RAID Controller Battery Model 21
- About the Adaptec 4000SAS 22
- About the Adaptec 4800SAS 23
- About the Adaptec 4805SAS 24
- About the Adaptec 2420SA 25
- About the Adaptec 2820SA 26
- About the Adaptec 2130SLP 27
- 30 (15 per channel) 28
- Choosing a RAID Level 30
- Selecting Disk Drives 31
- SAS Cables 32
- SATA Cables 33
- SCSI Cables 33
- Installation Options 34
- Basic Installation Steps 34
- Installing the Controller 35
- Before You Begin 36
- Controllers 38
- SATA disk drives attached to 39
- Next Steps 42
- Creating a Bootable 43
- Setting the Boot Controller 44
- Creating an Array 44
- Making Your Array Bootable 49
- Installing the Driver and 50
- Creating a Driver Disk 51
- Installing with Windows 52
- Installing with Red Hat Linux 53
- Installing with SuSE Linux 53
- Installing with NetWare 54
- Installing the Driver on an 56
- Existing Operating System 56
- Installing on Windows 58
- Installing on NetWare 59
- Managing Your Storage 60
- About Adaptec Storage Manager 61
- Configuration Utility 62
- Which Utility Should I Use? 63
- Solving Problems 64
- Troubleshooting Checklist 65
- Silencing the Alarm 66
- Resetting the Controller 68
- Introduction to Serial 70
- Attached SCSI (SAS) 70
- What is SAS? 71
- What’s a Phy? 72
- What’s a SAS Port? 73
- What’s a SAS Address? 73
- What’s a SAS Connector? 74
- What do SAS Cables Look Like? 75
- Direct-attach Connections 76
- Backplane Connections 76
- SAS Expander Connections 77
- Understanding RAID 79
- Understanding Drive Segments 80
- RAID 0 (Non-RAID Arrays) 80
- RAID 1 Arrays 81
- RAID 1 Enhanced Arrays 82
- RAID 10 Arrays 83
- RAID 5 Arrays 84
- RAID 5EE Arrays 85
- RAID 50 Arrays 86
- RAID 6 Arrays 87
- RAID 60 Arrays 88
- Selecting the Best RAID Level 89
- Using the Adaptec RAID 90
- Controller Utility 90
- Creating a New Array 92
- Managing Existing Arrays 92
- Initializing Disk Drives 93
- Rescanning Disk Drives 93
- Secure Erasing Disk Drives 94
- Opening a -Select Utility 95
- Applying Changes and Exiting 95
- General Controller Settings 96
- Option Description 97
- Viewing the Event Log 100
- Using the ACU for DOS 101
- Getting Started 102
- Running the ACU Using Scripts 103
- About Playback Mode 104
- About Record Mode 104
- Required 105
- ? Description 105
- ● Yes—Initialize all drives 107
- ● No—Disable read caching 108
- Maximum (the 109
- ● No—Disable the write cache 110
- Keyword Description 111
- ACU Error Codes 112
- Sample Scripts 113
- =Adaptec 114
- Using the Adaptec Flash 115
- (for example 116
- Obtaining the Firmware 116
- AFU with no arguments 117
- 4 Select Select an Operation 118
- AFU LIST 119
- AFU Commands 119
- UPDATE /C 0 123
- UPDATE /C 0, 2, 3 123
- Safety Information 125
- Technical Specifications 126
- Environmental Specifications 127
- DC Power Requirements 127
- Current Requirements 127
- Adaptec, Inc 134
- 691 South Milpitas Boulevard 134
- Milpitas, CA 95035 USA 134
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