Adaptec 1891300 - RAID Controller Guia do Utilizador Página 80
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Appendix B: Understanding RAID ● 80
RAID 5EE Arrays
A RAID 5EE array—also known as a hot space—is similar to a RAID 5 array except that it
includes a distributed spare drive and must be built from a minimum of four disk drives.
Unlike a hot spare, a distributed spare is striped evenly across the disk drives with the stored
data and parity data, and can’t be shared with other logical disk drives. A distributed spare
improves the speed at which the array is rebuilt following a disk drive failure.
A RAID 5EE array protects your data and increases read and write speeds. However, capacity is
reduced by two disk drives’ worth of space, which is for parity data and spare data.
In this figure, S represents the distributed spare, P represents the distributed parity data.
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
1S... P
2 P ... 449
S3... S
P 4 ... 500
Unused Space = 150 GB
Disk Drives in Logical Drive Based on the drive segment sizes used:
RAID 5EE Logical Drive = 500 GB plus parity
and hot spare.
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
- 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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