Dell OpenManage Server Administrator Managed Node for Fluid Cache for DAS Manuel d'utilisateur Page 43
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Understanding RAID Concepts 43
RAID 5 Characteristics:
• Groups
n
disks as one large virtual disk with a capacity of (
n
-1) disks.
• Redundant information (parity) is alternately stored on all disks.
• When a disk fails, the virtual disk still works, but it is operating in a
degraded state. The data is reconstructed from the surviving disks.
• Better read performance, but slower write performance.
• Redundancy for protection of data.
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 6 (Striping with additional distributed parity)
RAID 6 provides data redundancy by using data striping in combination with
parity information. Similar to RAID 5, the parity is distributed within each
stripe. RAID 6, however, uses an additional physical disk to maintain parity,
such that each stripe in the disk group maintains two disk blocks with parity
information. The additional parity provides data protection in the event of
two disk failures. In Figure 3-5, the two sets of parity information are
identified as P and Q.
- 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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