Dell OpenManage Server Administrator Version 7.2 Bedienungsanleitung Seite 41
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Understanding RAID Concepts 41
Figure 3-5. RAID 6
RAID 6 Characteristics:
• Groups
n
disks as one large virtual disk with a capacity of (
n
-2) disks.
• Redundant information (parity) is alternately stored on all disks.
• The virtual disk remains functional with up to two disk failures. The data
is reconstructed from the surviving disks.
• Better read performance, but slower write performance.
• Increased redundancy for protection of data.
• Two disks per span are required for parity. RAID 6 is more expensive in
terms of disk space.
Related Information:
• Organizing Data Storage for Availability and Performance
• Comparing RAID Level and Concatenation Performance
• Controller-supported RAID Levels
- User’s Guide 1
- Notes, Cautions, and Warnings 2
- Contents 3
- 4 Contents 4
- 6 Storage Information and 6
- 8 Contents 8
- 10 Contents 10
- 12 Contents 12
- 14 Contents 14
- 16 Contents 16
- 18 Contents 18
- 20 Contents 20
- Overview 21
- Supported Controllers 23
- Supported Enclosures 24
- Getting Started 25
- Launching Storage Management 26
- User Privileges 26
- Storage Object 27
- Health Subtab 27
- Interface 28
- Displaying the Online Help 28
- Common Storage Tasks 28
- Getting Started 29 29
- 30 Getting Started 30
- Understanding RAID Concepts 31
- RAID Concepts 32
- Performance 33
- Concatenation 35
- RAID Level 0 (Striping) 36
- RAID 0 Characteristics: 37
- RAID Level 1 (Mirroring) 38
- RAID 5 Characteristics: 39
- RAID 6 Characteristics: 41
- RAID 50 Characteristics: 43
- RAID 60 Characteristics: 45
- RAID 10 Characteristics: 47
- Storage Health 53
- Hot Spare Protection Policy 54
- Select Report 54
- Storage Component Severity 54
- Alerts or Events 56
- What is PCIe SSD 59
- PCIe SSD Features 59
- PCIe Sub System Properties 60
- PCIe Extender Cards 61
- Physical Device Properties 61
- Physical Device Tasks 62
- Blink and Unblink 63
- PCIe SSD Sub System Health 64
- Storage Properties 65
- Global Tasks 65
- Global Rescan 66
- Storage Controllers 67
- RAID Controller Features 72
- Controllers 73 73
- Cache Policy 74
- Controllers 75 75
- Write Policy 76
- Disk Cache Policy 78
- Firmware/Driver Versions 79
- Firmware/Driver Properties 80
- Controller Health 82
- Controller Information 83
- Controller Components 83
- Controller Properties 84
- 86 Controllers 86
- 88 Controllers 88
- To rescan a controller: 91
- Create Virtual Disk 91
- Enable Alarm (Controller) 91
- Disable Alarm (Controller) 91
- Set Rebuild Rate 94
- Reset Configuration 95
- Export Log 96
- 98 Controllers 98
- Disks and Global Hot Spares 98
- Controllers 101 101
- Controllers 102
- Clear Foreign Configuration 103
- 106 Controllers 106
- 108 Controllers 108
- Set Check Consistency Rate 110
- Set Reconstruct Rate 111
- Redundant Path Configuration 112
- Set Patrol Read Mode 115
- To set the Patrol Read mode: 116
- Start and Stop Patrol Read 117
- Change Controller Properties 118
- Manage Physical Disk Power 119
- Manage Preserved Cache 123
- Manage Encryption Key 124
- Encryption Key 125
- Manage CacheCade 127
- Resizing the CacheCade 128
- Renaming the CacheCade 128
- Deleting the CacheCade 129
- CacheCade Properties 129
- Convert to Non-RAID Disks 130
- Convert to RAID Capable Disks 130
- Patrol Read Report 131
- Check Consistency Report 131
- Slot Occupancy Report 131
- 134 Controllers 134
- Enclosures and Backplanes 135
- Enclosure Physical Disks 136
- Enclosure Fans 136
- Enclosure Power Supplies 136
- Enclosure Temperature Probes 136
- Enclosures and Backplanes 137 137
- SMART Thermal Shutdown 138
- Enclosure Management 139
- Enclosures and Backplanes 141 141
- 142 Enclosures and Backplanes 142
- Enclosure Tasks 144
- Available Reports 145
- Disable Alarm (Enclosure) 146
- Set Asset Data 146
- Set Temperature Probe Value 146
- View Slot Occupancy Report 146
- Enclosures and Backplanes 147 147
- Set Temperature Probe Values 149
- EMM Properties 151
- 152 Enclosures and Backplanes 152
- Fan Properties 153
- 154 Enclosures and Backplanes 154
- Power Supply Properties 155
- 156 Enclosures and Backplanes 156
- 158 Enclosures and Backplanes 158
- Enclosures and Backplanes 159 159
- 160 Enclosures and Backplanes 160
- Connectors 161
- Connector Health 163
- Connector Information 164
- Connector Components 164
- Connector Properties 164
- Logical Connector Properties 166
- Path Health 167
- Related Tasks 168
- Logical Connector Components 168
- Tape Drives 169
- 170 Tape Drives 170
- RAID Controller Batteries 171
- 172 RAID Controller Batteries 172
- Battery Tasks 173
- Battery Delay Learn Cycle 174
- Related Information: 175
- 176 RAID Controller Batteries 176
- Add a New Disk to Your System 178
- Other Disk Procedures 180
- Remove Dead Segments 189
- Prepare to Remove 189
- Rebuild 190
- Cancel Rebuild 190
- Online and Offline 192
- Revertible Hot Spare 193
- Instant Encrypt Erase 194
- Full Initialization 195
- Convert to RAID Capable Disk 196
- Convert to Non-RAID Disk 196
- Virtual Disks 197
- Virtual Disks 199 199
- Virtual Disks 201 201
- Express Wizard 202
- Creating Virtual Disks 203
- (continued) 205
- 206 Virtual Disks 206
- Recommendations 210
- Virtual Disk Properties 210
- 212 Virtual Disks 212
- Virtual Disk Tasks 214
- Reconfigure 215
- Restore Dead Segments 215
- Check Consistency 216
- Cancel Check Consistency 216
- Pause Check Consistency 216
- Resume Check Consistency 217
- Change Policy 218
- Replace Member Disk 218
- Clear Virtual Disk Bad Blocks 218
- Encrypt Virtual Disk 218
- Virtual Disks 219 219
- Virtual Disks 223 223
- Connector 0 226
- Physical Disks Selected 226
- Span Edit 230
- Virtual Disks 233 233
- Slow and Fast Initialize 234
- Virtual Disks 235 235
- Virtual Disk Task: Delete 236
- Virtual Disk Task: Rename 237
- To rename a virtual disk: 238
- Split Mirror 239
- Unmirror 239
- To Unmirror: 240
- Virtual Disks 243 243
- 244 Virtual Disks 244
- Required Conditions 245
- Hot Spare 247
- CacheCade Using Solid State 255
- Troubleshooting 257
- System Requirements 258
- Drivers and Firmware 258
- Isolate Hardware Problems 258
- Replacing a Failed Disk 259
- Virtual Disk Troubleshooting 261
- A Rebuild Does Not Work 262
- Cannot Create a Virtual Disk 263
- Management 264
- Virtual Disk Errors on Linux 264
- Troubleshooting 265 265
- “Medium” Error 266
- Degraded 267
- Format, or Other Operation 267
- Troubleshooting 269 269
- PCIe SSD Troubleshooting 270
- Troubleshooting 271 271
- 272 Troubleshooting 272
- Frequently Asked Questions 273
- Physical Disk? 274
- Which Controllers do I Have? 274
- How do I Turn off an Alarm? 275
- Supported Features 277
- 278 Supported Features 278
- Connector Tasks 280
- Physical Disk Tasks 281
- Virtual Disk Specifications 283
- 284 Supported Features 284
- Supported RAID Levels 286
- Controller Tasks 288
- 290 Supported Features 290
- 294 Supported Features 294
- 296 Supported Features 296
- 298 Supported Features 298
- 300 Supported Features 300
- Enclosure Support 301
- 308 Supported Features 308
- 312 Supported Features 312
- Enclosure and Backplane Tasks 319
- 320 Supported Features 320
- Storage Components 321
- Disk are Failed or Removed 322
- Version 326
- Probe is Failed 328
- Connections to the Enclosure 328
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