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Appendix B: Understanding RAID ● 82
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
*
*
Because they support four disk drives only, the ICP9047MA RAID controller can’t support RAID 50 or RAID 60 arrays.
Yes 67 – 94%
No 6
RAID 6 Yes 50 – 88%
No 4
RAID 60
1
Yes 50 – 88%
No 8
- SAS, SATA, and SCSI 1
- RAID Controllers 1
- Installation and 1
- User’s Guide 1
- Copyright 2
- Trademarks 2
- Disclaimer 2
- ICP vortex Customer Support 3
- Canadian Compliance Statement 5
- Contents 6
- Using the ICP Flash Utility 10
- 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
- RAID Controller Battery Model 17
- About the ICP5805BL 18
- About the ICP5045BL 19
- About the ICP5085BL 20
- About the ICP5125BR 21
- About the ICP5165BR 22
- About the ICP9085LI 23
- About the ICP5085BR 24
- About the ICP9047MA 25
- About the ICP9087MA 26
- About the ICP9014RO 27
- About the ICP9024RO 28
- Getting Started 29
- Choosing a RAID Level 30
- Selecting Disk Drives 31
- Selecting Cables 32
- SATA Cables 33
- Installation Options 34
- Basic Installation Steps 34
- In this chapter 36
- Installing the Controller 37
- Connecting External Devices 41
- Creating a Bootable Array 42
- Setting the Boot Controller 43
- Creating an Array 43
- Making Your Array Bootable 46
- Installing the Driver and an 47
- Operating System 47
- Creating a Driver Disk 48
- Installing with Windows 49
- Installing with Red Hat Linux 49
- Installing with SUSE Linux 50
- Installing with NetWare 50
- Installing with OpenServer 51
- Installing with Solaris 51
- Installing with UnixWare 52
- Installing with VMware 52
- Installing with FreeBSD 53
- Installing on Windows 56
- Installing on NetWare 56
- Installing on OpenServer 57
- Installing on Solaris 57
- Installing on UnixWare 58
- Installing on VMware 58
- Installing on FreeBSD 59
- Managing Your Storage Space 60
- About ICP Storage Manager 61
- About the ICP Flash Utility 62
- Which Utility Should I Use? 62
- Solving Problems 63
- Troubleshooting Checklist 64
- Silencing the Alarm 64
- Resetting the Controller 66
- In this appendix 67
- ) Web site at www.scsita.org 67
- What is SAS? 68
- What’s a Phy? 69
- What’s a SAS Port? 70
- What’s a SAS Address? 70
- What’s a SAS Connector? 70
- What do SAS Cables Look Like? 70
- Direct-attach Connections 71
- Backplane Connections 71
- SAS Expander Connections 72
- Understanding RAID 74
- Understanding Drive Segments 75
- Non-redundant Arrays (RAID 0) 75
- RAID 1 Arrays 76
- RAID 1 Enhanced Arrays 76
- RAID 10 Arrays 77
- RAID 5 Arrays 78
- RAID 5EE Arrays 79
- RAID 50 Arrays 80
- RAID 6 Arrays 81
- RAID 60 Arrays 81
- Selecting the Best RAID Level 82
- Creating a New Array 84
- Managing Existing Arrays 85
- Initializing Disk Drives 85
- Rescanning Disk Drives 85
- Secure Erasing Disk Drives 86
- Opening a -Select Utility 86
- Applying Changes and Exiting 86
- General Controller Settings 87
- Option Description 88
- Locating Disk Drives 90
- Identifying Disk Drives 90
- Viewing the Event Log 91
- Running the ACU Using Scripts 94
- About Record Mode 95
- Required 96
- ? Description 96
- HotspareDrives=0:0:0,0:1:0 97
- InitializeAll=Yes 97
- ACU exits with an error 98
- Keyword Description 99
- ACU Error Codes 100
- Sample Scripts 101
- System Requirements 104
- Before You Begin 104
- Running the Menu-based IFU 105
- Running the 106
- Connector Reference 110
- Pin Number Signal Description 111
- 22-55-2161 113
- Pin Number 113
- SFF-8087 Connector J5: 120
- SFF-8087 Connector J18: 120
- SFF-8087 Connector J14: 124
- 22-552101 125
- Environmental Specifications 129
- DC Power Requirements 129
- Current Requirements 129
- Index ● 131 131
- Index ● 132 132
- Index ● 133 133
- Index ● 134 134
- Konrad-Zuse-Str.9 135
- 74172 Neckarsulm 135
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