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Appendix B: Understanding RAID ● 103
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 10
- B Understanding RAID 10
- Contents ● 11 11
- F Safety Information 12
- G Technical Specifications 12
- About This Guide 13
- How to Find More Information 14
- Kit Contents and System 15
- Requirements 15
- Kit Contents 16
- DVD-ROM drive 17
- About Your RAID Controller 18
- Array-level Features 19
- Adding a Flash Backup Module 20
- About the Adaptec RAID 5085 21
- About the Adaptec RAID 5405 22
- About the Adaptec RAID 5445 23
- About the Adaptec RAID 51245 25
- About the Adaptec RAID 51645 26
- About the Adaptec RAID 52445 27
- About the Adaptec RAID 5405Z 28
- About the Adaptec RAID 5445Z 29
- About the Adaptec RAID 2045 31
- Adaptec RAID 2405/2405Q 32
- About the Adaptec RAID 2805 33
- About the Adaptec RAID 6405 34
- About the Adaptec RAID 6445 35
- About the Adaptec RAID 6405E 37
- About the Adaptec RAID 6805E 38
- About the Adaptec RAID 6405T 39
- Getting Started 41
- Choosing a RAID Level 42
- Disk Drives 43
- Installation Options 46
- Basic Installation Steps 46
- In this chapter 47
- Installing the Controller 48
- Supercapacitor 50
- Connector on daughterboard 50
- SAS/SATA 51
- Single-port connector 51
- Typical SSD installation 53
- Connecting External Devices 54
- Next Steps 54
- Creating a Bootable Array 55
- Setting the Boot Controller 56
- Creating an Array 56
- Making Your Array Bootable 59
- Installing the Driver and an 60
- Operating System 60
- Creating a Driver Disk 61
- Installing with Windows 62
- Installing with SuSE Linux 64
- Installing with Debian Linux 64
- Installing with Ubuntu Linux 66
- Installing with Solaris 68
- Installing with VMware ESX 4 68
- Installing with VMware ESXi 5 69
- Installing with FreeBSD 72
- Installing on Windows 75
- Installing on Debian Linux 76
- Installing on Ubuntu Linux 76
- Installing on Solaris 77
- Installing on VMware 77
- Installing on FreeBSD 79
- Managing Your Storage Space 80
- About Adaptec Storage Manager 81
- Which Utility Should I Use? 82
- Solving Problems 84
- Failed Device is faulty On 85
- Other No error Off 85
- Resetting the Controller 87
- Introduction to SAS 89
- What is SAS? 90
- What’s a Phy? 91
- What’s a SAS Port? 92
- What’s a SAS Address? 92
- What’s a SAS Connector? 92
- What do SAS Cables Look Like? 92
- Direct-attach Connections 93
- Backplane Connections 93
- SAS Expander Connections 94
- Understanding RAID 96
- Understanding Drive Segments 97
- Non-redundant Arrays (RAID 0) 97
- RAID 1 Arrays 98
- RAID 1 Enhanced Arrays 98
- RAID 10 Arrays 99
- RAID 5 Arrays 100
- RAID 5EE Arrays 101
- RAID 50 Arrays 102
- RAID 6 Arrays 103
- RAID 60 Arrays 103
- Selecting the Best RAID Level 104
- Using the Adaptec RAID 105
- Configuration Utility 105
- Running the ARC Utility 106
- Managing Existing Arrays 107
- Option Description 108
- Initializing Disk Drives 109
- Rescanning Disk Drives 109
- Secure Erasing Disk Drives 109
- Managing Global Hot Spares 109
- Creating a New JBOD 110
- Managing Existing JBODs 110
- Opening SerialSelect 111
- Applying Changes and Exiting 111
- General Controller Settings 112
- Power Management Settings 113
- Locating Disk Drives 114
- Identifying Disk Drives 115
- Viewing the Event Log 115
- System Requirements 117
- Before You Begin 117
- Running the Menu-based AFU 118
- Running the 119
- Quick Reference 123
- 22-55-2161 124
- Pin Number 124
- Specification 126
- Connector Specification 129
- J5 Pin Number Signal 131
- 2258500-R ASR-51645 RoHS Kit 133
- J4 Pin Number Signal 139
- Safety Information 148
- Technical Specifications 149
- Environmental Specifications 150
- DC Power Requirements 150
- Current Requirements 150
- Index ● 151 152
- Index ● 152 153
- Index ● 153 154
- PMC-Sierra, Inc 155
- 1380 Bordeaux Drive 155
- Sunnyvale, CA 94089 USA 155
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