LSI 3ware SAS 9750-8i Guia do Utilizador Página 21
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Understanding RAID Concepts and Levels
www.lsi.com/channel/products 9
In addition, RAID 10 arrays offer a higher degree of fault tolerance than
RAID 1 and RAID 5, since the array can sustain multiple drive failures
without data loss. For example, in a twelve-drive RAID 10 array, up to six
drives can fail (half of each mirrored pair) and the array will continue to
function. Please note that if both halves of a mirrored pair in the RAID 10
array fail, then all of the data will be lost.
Figure 6. RAID 10 Configuration Example
RAID 50
RAID 50 is a combination of RAID 5 with RAID 0. This array type provides
fault tolerance and high performance. RAID 50 requires a minimum of six
drives.
Several combinations are available with RAID 50. For example, on a 12-port
controller, you can have a grouping of 3, 4, or 6 drives. A grouping of 3 means
that the RAID 5 arrays used have 3 disks each; four of these 3-drive RAID 5
arrays are striped together to form the 12-drive RAID 50 array. On a 16-port
controller, you can have a grouping of 4 or 8 drives.
No more than four RAID 5 subunits are allowed in a RAID 50 unit. For
example, a 24-drive RAID 50 unit may have groups of 12, 8, or 6 drives, but
not groups of 4 or 3.
In addition, RAID 50 arrays offer a higher degree of fault tolerance than
RAID 1 and RAID 5, since the array can sustain multiple drive failures
without data loss. For example, in a twelve-drive RAID 50 array, up to one
drive in each RAID 5 set can fail and the array will continue to function.
Please note that if two or more drives in a RAID 5 set fail, then all of the data
will be lost.
- SATA+SAS 1
- Controller Card 1
- Software User Guide 1
- User Guide 1
- Document Description 2
- Disclaimer 2
- License Restriction 2
- Copyright Notice 2
- Trademark Acknowledgments 2
- Table of Contents 3
- About this User Guide 8
- Conventions 10
- Screenshots 10
- Click the Show 11
- Navigation button to 11
- Contents 11
- Introducing the LSI 3ware 13
- SATA+SAS RAID Controller 13
- System Requirements 14
- Drive Requirements 15
- Operating System 15
- Other Requirements 16
- RAID Concepts 17
- Available RAID Configurations 18
- Single Disk 22
- Hot Spare 22
- Support for Over 2 Terabytes 25
- Management 26
- Monitoring, Maintenance, and 27
- Troubleshooting Features 27
- Using 3BM 30
- Figure 8. 3ware BIOS Screen 31
- Specifying a Hot Spare 38
- What Next? 39
- Getting Started with Your 40
- 3ware RAID Controller 40
- Driver Installation 44
- Materials Required 45
- Creating a 3ware Driver Disk 46
- 3 Click Next 49
- Available to Windows 50
- . You can also contact LSI 51
- Obtaining 3ware Linux Drivers 52
- Materials required 53
- Different Device 55
- Instructions 55
- 3ware BIOS Manager (3BM) 63
- Introduction 63
- Policy screen. Pressing 65
- Working in the 3BM Screens 66
- Settings 68
- > BIOS Settings 68
- BIOS Loading Options 69
- Options for Entering BIOS 70
- Changing BIOS Settings 70
- Getting Help While Using 3BM 72
- 3DM 2 (3ware Disk Manager) 73
- Installing 3DM 74
- Starting 3DM 2 and Logging In 74
- 3DM 2 Menus 78
- Refreshing the Screen 80
- Table 7: List of 3DM 2 Pages 82
- Setting Up 3DM 2 Preferences 83
- Setting the Listening Port # 86
- Configuring Your Controller 89
- About Controller Policies 91
- Viewing Controller Policies 93
- Auto-Carving 98
- Changing the Phy Link Speed 101
- Configuring Units 103
- Boot volume size 105
- Initialization Method 105
- Name of the unit (optional) 105
- Unit policies 106
- Creating a Unit through 3DM 2 107
- Creating a Unit through 3BM 109
- Ordering Units in 3BM 113
- Creating a Hot Spare 116
- Naming a Unit 118
- Setting Unit Policies 119
- When Rebuilding) 128
- About StorSave Profile Levels 131
- Rapid RAID Recovery 133
- . Protection against 134
- Migrating 135
- Changing RAID Level 137
- Expanding Unit Capacity 138
- Configuration 139
- Deleting a Unit 140
- Deleting a Unit through 3DM 141
- Deleting a Unit through 3BM 142
- Removing a Unit 143
- Removing a Unit Through 3DM 144
- Removing a Unit Through 3BM 145
- Controller 146
- Adding a Drive 147
- Removing a Drive 148
- Rescanning the Controller 150
- Maintaining Units 151
- Viewing a List of Drives 153
- Unit Statuses 155
- Drive Statuses 156
- About Inoperable Units 157
- Monitor > Alarms 160
- Downloading an Error Log 162
- Background Tasks 163
- About Initialization 164
- About Verification 167
- What Verification Does 168
- Using Auto Verification 169
- Starting a Verify Manually 170
- Rebuilding Units 172
- Rebuilding a Unit Through 3DM 173
- Rebuilding Units through 3BM 174
- Different Drive 177
- Setting Background Task Rate 180
- Scheduling Background Tasks 181
- Scheduled Task Duration 182
- Schedule 183
- Tasks column 187
- Maintaining Your Controller 188
- 3ware Bootable CD 192
- Fedora Core 195
- Viewing Battery Information 198
- Testing Battery Capacity 199
- Enclosure Management 202
- Viewing a List of Enclosures 203
- 3BM” on page 191 205
- Fan Status 206
- Temp Sensor Status 206
- Power Supply Status 206
- Slot Summary 207
- Working with Enclosure Alarms 208
- 3DM 2 Reference 212
- Controller Summary page 213
- Controller Details page 214
- Unit Information page 215
- Unit Details page 216
- Drive Information page 218
- Drive Details window 220
- SMART Data 221
- Controller Phy Summary page 222
- Controller Settings page 223
- Background Task Rate and Mode 224
- Unit Policies 224
- Unit Names 226
- Other Controller Settings 226
- Update Firmware 227
- Scheduling page 228
- Task Schedules 229
- Self-test Schedules 230
- Maintenance page 231
- Unit Maintenance 232
- Drive Information 233
- Create Unit 237
- Set Spare 239
- Clear Configuration 239
- Alarms page 240
- Battery Backup page 241
- Enclosure Summary page 243
- Enclosure Details page 244
- Enclosure ID 245
- Fan Summary 245
- Temp Sensor Summary 245
- Power Supply Summary 246
- 3DM 2 Settings page 247
- E-mail Notification 248
- Password 248
- Page Refresh 249
- HTTP Settings 249
- Server Configuration 249
- Troubleshooting 250
- Command Logging 252
- Types of DPM Statistics 253
- Available DPM Commands 253
- Enclosure-Related Problems 255
- Problems in 3DM and 3BM 257
- 0002 Degraded unit 263
- 0004 Rebuild failed 264
- 0005 Rebuild completed 265
- 0006 Incomplete unit detected 265
- 0007 Initialize completed 266
- 0009 Drive timeout detected 267
- 000A Drive error detected 267
- 000B Rebuild started 268
- 000C Initialize started 269
- 000E Initialize failed 269
- 000F SMART threshold exceeded 270
- 0019 Drive removed 270
- 001A Drive inserted 271
- 001E Unit inoperable 271
- 001F Unit Operational 272
- 0021 Downgrade UDMA mode 272
- 0022 Upgrade UDMA mode 273
- 0023 Sector repair completed 273
- 0026 Drive ECC error reported 275
- 0028 DCB version unsupported 276
- 0029 Verify started 277
- 002A Verify failed 277
- 002B Verify completed 278
- 0030 Drive not supported 281
- 0032 Spare capacity too small 281
- 0033 Migration started 282
- 0034 Migration failed 282
- 0035 Migration completed 283
- 0037 SO-DIMM not compatible 283
- 0038 SO-DIMM not detected 284
- 003B Rebuild paused 285
- 003C Initialize paused 286
- 003D Verify paused 286
- 003E Migration paused 287
- 0045 Battery voltage is low 290
- 0046 Battery voltage is high 290
- 0055 Battery charging started 295
- 0057 Battery charging fault 296
- 005A Battery is present 297
- 005B Battery is not present 297
- 005C Battery is weak 297
- 0062 Enclosure removed 298
- 0063 Enclosure added 299
- 0064 Local link up 299
- 0065 Local link down 299
- 0081 RAID key not found 301
- 8000 Enclosure fan normal 301
- 8001 Enclosure fan error 301
- 8002 Enclosure fan removed 302
- 8003 Enclosure fan added 302
- 8004 Enclosure fan unknown 302
- 8005 Enclosure fan off 303
- 8020 Enclosure temp normal 303
- 8021 Enclosure temp low 303
- 8022 Enclosure temp high 304
- 8025 Enclosure temp removed 305
- 8026 Enclosure temp added 306
- 8027 Enclosure temp critical 306
- 8028 Enclosure temp unknown 306
- 8030 Enclosure power normal 307
- 8031 Enclosure power fail 307
- 8032 Enclosure power removed 308
- 8033 Enclosure power added 308
- 8034 Enclosure power unknown 308
- 8037 Enclosure power off 309
- 8040 Enclosure voltage normal 309
- 8041 Enclosure voltage over 310
- 8042 Enclosure voltage under 310
- 8044 Enclosure current normal 311
- 8045 Enclosure current over 311
- Appendices 314
- Glossary 315
- Software Installation 322
- /mnt/autorun 323
- Installing Software 327
- Uninstalling 3ware Software 328
- Compliance and Conformity 329
- Statements 329
- Canadian Compliance Statement 330
- Warranty, Technical Support 331
- Exclusions 332
- State Law Provisions 332
- Feedback on this manual 333
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