Adaptec 1891300 - RAID Controller User's Guide Page 77
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Appendix B: Understanding RAID ● 77
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 in this figure.
RAID 1 Enhanced Arrays
A RAID 1 Enhanced (RAID 1E) array—also known as a striped mirror—is similar to a RAID 1
array except that data is both mirrored and striped, and more disk drives can be included. A
RAID 1E array can be built from three or more disk drives.
In this example, the large bold numbers represent the striped data, and the smaller, non-bold
numbers represent the mirrored data stripes.
Disk Drive 2
Disk Drive 1 250 GB
400 GB
Drive Segment Size
(Smallest Disk Drive)
Disk Drive 1
Disk Drive 2
Disk Drives in Logical Drive
RAID 1 Logical Drive = 250 GB
1 – 250
1 – 250
Unused Space = 150 GB
Disk Drive 2
Disk Drive 1
400 GB
Disk Drives in Logical Drive RAID 1E Logical Drive = 600 GB
400 GB
400 GBDisk Drive 3
Disk Drive 2
Disk Drive 1
Disk Drive 3
1 3
2
3
4
5
6
1
2
6
4
5
- 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
- About Your RAID Controller 15
- Array-level Features 16
- Adding Enhanced Features 17
- About the Adaptec 3085 18
- About the Adaptec 3405 19
- About the Adaptec 3805 20
- About the Adaptec 31205 21
- About the Adaptec 31605 22
- Mode 0 Flash connector 22
- About the Adaptec 4000 23
- About the Adaptec 4800SAS 24
- 256 MB also available 24
- About the Adaptec 4805SAS 25
- About the Adaptec 2420SA 26
- About the Adaptec 2820SA 27
- About the Adaptec 2130SLP 28
- About the Adaptec 2230SLP 29
- Getting Started 30
- Choosing a RAID Level 31
- Selecting Disk Drives 32
- Selecting Cables 33
- SATA Cables 34
- Installation Options 35
- Basic Installation Steps 35
- In this chapter 37
- Installing the Controller 38
- Connecting External Devices 42
- Creating a Bootable Array 43
- Setting the Boot Controller 44
- Creating an Array 44
- Making Your Array Bootable 47
- Installing the Driver and an 48
- Operating System 48
- Creating a Driver Disk 49
- Installing with Windows 50
- Installing with Red Hat Linux 50
- Installing with SUSE Linux 51
- Installing with NetWare 51
- Installing with OpenServer 52
- Installing with Solaris 52
- Installing with UnixWare 53
- Installing with VMware 53
- Installing with FreeBSD 54
- Installing on Windows 57
- Installing on NetWare 57
- Installing on OpenServer 58
- Installing on Solaris 58
- Installing on UnixWare 59
- Installing on VMware 59
- Installing on FreeBSD 60
- Managing Your Storage Space 61
- About Adaptec Storage Manager 62
- Which Utility Should I Use? 63
- Solving Problems 64
- Troubleshooting Checklist 65
- Silencing the Alarm 65
- Resetting the Controller 67
- ) Web site at www.scsita.org 68
- In this appendix 68
- What is SAS? 69
- What’s a Phy? 70
- What’s a SAS Port? 71
- What’s a SAS Address? 71
- What’s a SAS Connector? 71
- What do SAS Cables Look Like? 71
- Direct-attach Connections 72
- Backplane Connections 72
- SAS Expander Connections 73
- Understanding RAID 75
- Understanding Drive Segments 76
- Non-redundant Arrays (RAID 0) 76
- RAID 1 Arrays 77
- RAID 1 Enhanced Arrays 77
- RAID 10 Arrays 78
- RAID 5 Arrays 79
- RAID 5EE Arrays 80
- RAID 50 Arrays 81
- RAID 6 Arrays 82
- RAID 60 Arrays 82
- Selecting the Best RAID Level 83
- Using the Adaptec RAID 84
- Configuration Utility 84
- Running the ARC Utility 85
- Managing Existing Arrays 86
- Initializing Disk Drives 86
- Rescanning Disk Drives 86
- Secure Erasing Disk Drives 87
- Opening a -Select Utility 87
- Applying Changes and Exiting 87
- General Controller Settings 88
- Option Description 89
- Locating Disk Drives 91
- Identifying Disk Drives 91
- Viewing the Event Log 92
- Running the ACU Using Scripts 95
- About Record Mode 96
- Required 97
- ? Description 97
- HotspareDrives=0:0:0,0:1:0 98
- InitializeAll=Yes 98
- ACU exits with an error 99
- Keyword Description 100
- ACU Error Codes 101
- Sample Scripts 102
- System Requirements 105
- Before You Begin 105
- Running the Menu-based AFU 106
- Running the 107
- I2C Connector Reference 111
- Pin Number Signal Description 112
- 22-55-2161 114
- Pin Number 114
- SFF-8087 Connector J5: 125
- SFF-8087 Connector J18: 125
- SFF-8087 Connector J14: 125
- 22-552101 126
- SFF-8484 Connector J7: 128
- Electrostatic Discharge (ESD) 129
- Environmental Specifications 131
- DC Power Requirements 131
- Current Requirements 131
- Index ● 133 133
- Index ● 134 134
- Index ● 135 135
- Index ● 136 136
- Adaptec, Inc 137
- 691 South Milpitas Boulevard 137
- Milpitas, CA 95035 USA 137
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