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Understanding RAID Concepts and Levels
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Available RAID Configurations
The following RAID levels and configurations are available for drives
attached to a 9590SE-4ME 3ware RAID controller:
• RAID 0
• RAID 1
• RAID 5
• RAID 10
• Single Disk
• Hot Spare
For how to configure RAID units, see “Configuring a New Unit” on page 34.
RAID 0
RAID 0 provides improved performance, but no fault tolerance. Since the
data is striped across more than one disk, RAID 0 disk arrays achieve high
transfer rates because they can read and write data on more than one drive
simultaneously. The stripe size is configurable during unit creation. Requires
a minimum of two drives.
When drives are configured in a striped disk array (see Figure 1), large files
are distributed across the multiple disks using RAID 0 techniques.
Striped disk arrays give exceptional performance, particularly for data
intensive applications such as video editing, computer aided design and
geographical information systems.
RAID 0 arrays are not fault tolerant. The loss of any drive results in the loss of
all the data in that array, and can even cause a system hang, depending on
your operating system. RAID 0 arrays are not recommended for high
availability systems unless additional precautions are taken to prevent system
hangs and data loss.
Figure 1. RAID 0 Configuration Example
RAID 1
RAID 1 provides fault tolerance and a speed advantage over non-RAID disks.
Also known as a mirrored array. Mirroring is done on pairs of drives.
Mirrored disk arrays write the same data to two different drives using RAID 1
algorithms (see Figure 2). This gives your system fault tolerance by
- User Guide for the Power Mac 1
- Copyright 2
- Trademarks 2
- Disclaimer 2
- Table of Contents 3
- About this User Guide 7
- Conventions 8
- Screenshots 8
- Getting Started with Your 9
- 3ware RAID Controller 9
- Introducing the 3ware® 12
- 9590SE-4ME RAID Controller 12
- System Requirements 13
- RAID Concepts 14
- Available RAID Configurations 15
- Single Disk 17
- Hot Spare 17
- Management 19
- Monitoring, Maintenance, and 20
- Troubleshooting Features 20
- 3DM 2 (3ware Disk Manager) 22
- Introduction 22
- Browser Requirements for 3DM 23
- Installing 3DM 23
- Starting 3DM and Logging In 24
- Working with the 3DM Screens 28
- 3DM Menus 29
- Refreshing the Screen 30
- Table 5: List of 3DM Pages 31
- Setting Up 3DM Preferences 32
- Setting the Incoming Port # 35
- Configuring Your Controller 36
- Viewing Controller Policies 38
- About Controller Policies 39
- Auto-Carving 41
- Configuring Units 42
- Configuring a New Unit 43
- Name of the unit (optional) 44
- Unit policies 44
- Creating a Unit 45
- Initialize 47
- Partition 49
- Messages 50
- Naming a Unit 51
- Setting Unit Policies 52
- About StorSave Profile Levels 56
- Chapter 5. Configuring Units 58
- Changing RAID Level 60
- Expanding Unit Capacity 61
- Configuration 61
- Deleting a Unit 62
- Removing a Unit 64
- Adding a Drive 66
- Removing a Drive 66
- Rescanning the Controller 68
- Maintaining Units 69
- Chapter 6. Maintaining Units 70
- Unit Statuses 71
- Drive Statuses 72
- About Degraded Units 73
- About Inoperable Units 73
- Downloading an Error Log 75
- Background Tasks 76
- About Initialization 77
- About Verification 78
- What Verification Does 79
- Starting a Verify Manually 80
- Rebuilding Units 81
- Different Drive 83
- Setting Background Task Rate 83
- Scheduling Background Tasks 84
- Scheduled Task Duration 85
- Removing a Task Schedule 87
- Identify column 90
- Maintaining Your Controller 91
- Download Released Software 92
- 3DM 2 Reference 93
- Controller Summary page 94
- Controller Details page 95
- Unit Information page 96
- Unit Details page 97
- Drive Information page 98
- Drive Details window 100
- Controller Settings page 101
- Background Task Rate 102
- Unit Policies 102
- Unit Names 103
- Other Controller Settings 103
- Scheduling page 105
- Self-test Schedules 106
- Task Schedules 106
- Maintenance page 107
- Rescan Controller 108
- Unit Maintenance 108
- Unit Information 108
- Drive Information 109
- Maintenance Task Buttons 109
- Create Unit 112
- Alarms page 114
- Battery Backup page 115
- Enclosure Summary page 115
- Enclosure Details page 116
- 3DM 2 Settings page 117
- Password 118
- Page Refresh 118
- Remote Access 119
- HTTP Settings 119
- Troubleshooting 120
- Enclosure-Related Problems 121
- Chapter 9. Troubleshooting 122
- 0002 Degraded unit 125
- 0004 Rebuild failed 125
- 0005 Rebuild completed 125
- 0006 Incomplete unit detected 126
- 0007 Initialize completed 126
- 0009 Drive timeout detected 126
- 000A Drive error detected 127
- 000B Rebuild started 127
- 000C Initialize started 127
- 000D Unit deleted 127
- 000E Initialize failed 128
- 000F SMART threshold exceeded 128
- 0019 Drive removed 128
- 001A Drive inserted 128
- 001E Unit inoperable 129
- 001F Unit Operational 129
- 0021 Downgrade UDMA mode 129
- 0022 Upgrade UDMA mode 129
- 0023 Sector repair completed 129
- 0024 Sbuf memory test failed 130
- 0026 Drive ECC error reported 130
- 0028 DCB version unsupported 131
- 0029 Verify started 131
- 002A Verify failed 131
- 0038 SO-DIMM not detected 134
- 003B Rebuild paused 134
- 003C Initialize paused 134
- Appendices 141
- Glossary 143
- and good performance 144
- Appendix A. Glossary 148
- OK to start the installer 149
- Next to continue 153
- Compliance and Conformity 157
- Statements 157
- Warranty, Technical Support 159
- Exclusions 160
- State Law Provisions 160
- Feedback on this manual 161
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