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42 Understanding RAID Concepts
Related Information:
• Organizing Data Storage for Availability and Performance
• Comparing RAID Level and Concatenation Performance
• Controller-supported RAID Levels
• Number of Physical Disks per Virtual Disk
• Maximum Number of Virtual Disks per Controller
RAID Level 5 (Striping with distributed parity)
RAID 5 provides data redundancy by using data striping in combination with
parity information. Rather than dedicating a physical disk to parity, however,
the parity information is striped across all physical disks in the disk group.
Figure 3-4. Striping Disks with Distributed Parity
- User’s Guide 1
- Notes, Cautions, and Warnings 2
- Contents 3
- 4 Contents 4
- 6 Contents 6
- 8 Contents 8
- 10 Contents 10
- 12 Contents 12
- 14 Contents 14
- 16 Contents 16
- 18 Contents 18
- 20 Contents 20
- 22 Contents 22
- Overview 23
- Supported Controllers 24
- Supported Enclosures 26
- Getting Started 27
- Launching Storage Management 28
- User Privileges 29
- Interface 30
- Displaying the Online Help 30
- Common Storage Tasks 31
- 32 Getting Started 32
- Understanding RAID Concepts 33
- Hardware and Software RAID 34
- RAID Concepts 34
- Performance 35
- Concatenation 37
- RAID Level 0 (Striping) 39
- RAID Level 1 (Mirroring) 40
- RAID 1 Characteristics: 41
- RAID 5 Characteristics: 43
- RAID 6 Characteristics: 44
- RAID 50 Characteristics: 46
- RAID 60 Characteristics: 48
- RAID 10 Characteristics: 50
- Storage Health 57
- Hot Spare Protection Policy 58
- Select Report 58
- Storage Component Severity 58
- Alerts or Events 60
- Physical Disk Status Changes 62
- What is PCIe SSD 65
- PCIe SSD Features 65
- PCIe Sub System Properties 66
- PCIe Extender Cards 67
- Physical Device Properties 67
- Physical Device Tasks 70
- PCIe SSD Sub System Health 73
- Fluid Cache Disks 76
- Fluid Cache Pool 77
- 78 Fluid Cache for DAS 78
- Cache Pool Usage 80
- Fluid Cache for DAS 81 81
- Properties Description 81
- License Settings 82
- Fluid Cache for DAS 83 83
- 84 Fluid Cache for DAS 84
- Storage Properties 85
- Global Tasks 85
- Global Rescan 86
- Storage Controllers 87
- SCSI RAID Controllers 92
- CERC SATA RAID Controllers 92
- CERC ATA RAID Controllers 92
- SAS RAID Controllers 92
- RAID Controller Features 93
- Cache Policy 95
- Write Policy 96
- Disk Cache Policy 98
- Cluster-enabled Controllers 99
- Controller 100
- Non-RAID SCSI Controllers 101
- Non-RAID SAS Controllers 101
- Firmware/Driver Versions 102
- Controller Health 104
- Controller Information 105
- Controller Components 105
- Controller Properties 106
- 108 Controllers 108
- 110 Controllers 110
- Controller Tasks 111
- Available Reports 113
- To rescan a controller: 114
- Create Virtual Disk 114
- Enable Alarm (Controller) 114
- Disable Alarm (Controller) 114
- Quiet Alarm (Controller) 114
- Test Alarm (Controller) 115
- Set Rebuild Rate 115
- Export Log File 115
- Reset Configuration 117
- Export Log 118
- Controllers 123 123
- Controllers 124
- Clear Foreign Configuration 125
- 128 Controllers 128
- 130 Controllers 130
- Set Check Consistency Rate 132
- Set Reconstruct Rate 133
- Redundant Path Configuration 134
- Set Patrol Read Mode 137
- To set the Patrol Read mode: 138
- Start and Stop Patrol Read 139
- Change Controller Properties 140
- Manage Physical Disk Power 141
- Manage Preserved Cache 144
- Manage Encryption Key 145
- Encryption Key 146
- Manage CacheCade 148
- Creating a CacheCade 149
- Resizing the CacheCade 149
- Renaming the CacheCade 149
- Deleting the CacheCade 150
- CacheCade Properties 150
- Convert to Non-RAID Disks 151
- Convert to RAID Capable Disks 151
- Patrol Read Report 152
- Check Consistency Report 152
- Slot Occupancy Report 152
- Controllers 153 153
- 154 Controllers 154
- Enclosures and Backplanes 155
- Enclosure Physical Disks 156
- Enclosure Fans 156
- Enclosure Power Supplies 156
- Enclosure Temperature Probes 156
- Enclosures and Backplanes 157 157
- SMART Thermal Shutdown 158
- PowerVault 221S Enclosures 159
- Enclosure Management 159
- 162 Enclosures and Backplanes 162
- Enclosure Tasks 164
- Disable Alarm (Enclosure) 166
- Set Asset Data 166
- Set Temperature Probe Value 166
- View Slot Occupancy Report 166
- Enclosures and Backplanes 167 167
- Set Temperature Probe Values 169
- EMM Properties 171
- 172 Enclosures and Backplanes 172
- Fan Properties 173
- 174 Enclosures and Backplanes 174
- Power Supply Properties 175
- 176 Enclosures and Backplanes 176
- 178 Enclosures and Backplanes 178
- Enclosures and Backplanes 179 179
- 180 Enclosures and Backplanes 180
- Connectors 181
- Connectors 183 183
- Connector Health 184
- Connector Information 185
- Connector Components 185
- Connector Properties 185
- 186 Connectors 186
- Logical Connector Properties 187
- Path Health 188
- Related Tasks 189
- Logical Connector Components 189
- 190 Connectors 190
- RAID Controller Batteries 191
- 192 RAID Controller Batteries 192
- Battery Tasks 193
- Battery Delay Learn Cycle 194
- Related Information: 195
- 196 RAID Controller Batteries 196
- Add a New Disk to Your System 198
- Related Information 199
- Other Disk Procedures 200
- Remove Dead Segments 209
- Prepare to Remove 209
- Initialize 210
- Rebuild 211
- Cancel Rebuild 211
- Online and Offline 212
- Revertible Hot Spare 214
- Instant Encrypt Erase 215
- Full Initialization 216
- Convert to RAID Capable Disk 217
- Convert to Non-RAID Disk 217
- Virtual Disks 219
- Virtual Disks 221 221
- Virtual Disks 223 223
- Express Wizard 225
- Creating Virtual Disks 226
- (continued) 228
- 230 Virtual Disks 230
- Recommendations 234
- Virtual Disk Properties 235
- 236 Virtual Disks 236
- 238 Virtual Disks 238
- Virtual Disk Tasks 239
- Reconfigure 240
- Cancel Format or Initialize 240
- Restore Dead Segments 241
- Check Consistency 242
- Cancel Check Consistency 242
- Pause Check Consistency 243
- Resume Check Consistency 243
- Change Policy 244
- Replace Member Disk 244
- Partitions of Virtual Disk 245
- Virtual Disks 247 247
- Virtual Disks 251 251
- Connector 0 254
- Physical Disks Selected 255
- Span Edit 259
- Virtual Disks 261 261
- Considerations for Format 264
- Virtual Disks 265 265
- Virtual Disk Task: Delete 267
- Virtual Disk Task: Rename 268
- Split Mirror 269
- Unmirror 270
- To Unmirror: 271
- Virtual Disks 275 275
- Required Conditions 277
- SAS Controller Conditions 278
- Moving the Disks 279
- Hot Spare 281
- CacheCade Using Solid State 289
- BIOS Terminology 291
- 292 BIOS Terminology 292
- Troubleshooting 293
- System Requirements 294
- Drivers and Firmware 294
- Isolate Hardware Problems 294
- Replacing a Failed Disk 295
- Troubleshooting 297 297
- Virtual Disk Troubleshooting 298
- Troubleshooting 299 299
- Cannot Create a Virtual Disk 301
- Management 301
- Virtual Disk Errors on Linux 301
- Troubleshooting 303 303
- “Medium” Error 305
- Format, or Other Operation 306
- Troubleshooting 307 307
- PCIe SSD Troubleshooting 309
- Fluid Cache for DAS 310
- Troubleshooting 311 311
- 312 Troubleshooting 312
- Frequently Asked Questions 313
- Physical Disk? 314
- Which Controllers do I Have? 314
- How do I Turn off an Alarm? 315
- Supported Features 317
- 318 Supported Features 318
- Connector Tasks 319
- Physical Disk Tasks 320
- 322 Supported Features 322
- Virtual Disk Specifications 323
- 324 Supported Features 324
- Supported RAID Levels 326
- Enclosure Support 328
- CERC 6/I Controllers 335
- 348 Supported Features 348
- 352 Supported Features 352
- 354 Supported Features 354
- 356 Supported Features 356
- 358 Supported Features 358
- 366 Supported Features 366
- 370 Supported Features 370
- Enclosure and Backplane Tasks 377
- 378 Supported Features 378
- 380 Supported Features 380
- Storage Components 381
- Disk are Failed or Removed 382
- Degraded 382
- Version 386
- Probe is Failed 388
- Connections to the Enclosure 388
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