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Appendix B: Understanding RAID ● 95
Selecting the Best RAID Level
Use this table to select the RAID levels that are most appropriate for the logical drives on your
storage space, based on the number of available disk drives and your requirements for
performance and reliability.
Disk drive usage, read performance, and write performance depend on the number of drives in
the logical drive. In general, the more drives, the better the performance.
RAID Level Redundancy
Disk Drive
Usage
Read
Performance
Write
Performance
Built-in
Hot Spare
Minimum
Disk
Drives
RAID 0 No 100%
No 2
RAID 1 Yes 50%
No 2
RAID 1E Yes 50%
No 3
RAID 10 Yes 50%
No 4
RAID 5 Yes 67 – 94%
No 3
RAID 5EE Yes 50 – 88%
Yes 4
RAID 50 Yes 67 – 94%
No 6
RAID 6 Yes 50 – 88%
No 4
RAID 60
Yes 50 – 88%
No 8
- 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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