Dell OpenManage Server Administrator Version 7.0 Manual de usuario Pagina 55
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Understanding RAID Concepts 55
No-RAID
In Storage Management, a virtual disk of unknown metadata is considered a
No- RAID volume. Storage Management does not support this type of virtual
disks. These must either be deleted or the physical disk must be removed.
Storage Management allows Delete and Rename operation on No-RAID
volumes.
RAID 6 Excellent Sequential
reads: good.
Transaction
al reads:
Very good
Fair, unless
using write-
back cache
Poor N + 2
(N = at
least two
disks)
Critical
information.
Databases
and other
read-
intensive
transactional
uses.
RAID 60 Excellent Very Good Fair Poor X x (N +
2)
(N = at
least 2)
Critical
information.
Medium-
sized
transactional
or data-
intensive
uses.
Table 3-1. RAID Level and Concatenation Performance Comparison
(continued)
RAID
Level
Data
Availability
Read
Performance
Write
Performance
Rebuild
Performance
Minimum
Disks
Required
Suggested
Uses
N = Number of physical disks
X = Number of RAID sets
- User’s Guide 1
- Notes and Cautions 2
- Contents 3
- 4 Contents 4
- 6 Contents 6
- 8 Contents 8
- 10 Contents 10
- 12 Contents 12
- 14 Contents 14
- 16 BIOS Terminology 15
- 16 Contents 16
- 18 Contents 18
- 20 Contents 20
- 22 Contents 22
- Overview 23
- Supported Controllers 25
- Supported Enclosures 26
- Overview 27 27
- 28 Overview 28
- Getting Started 29
- Launching Storage Management 30
- User Privileges 30
- Storage Object 31
- Health Subtab 31
- Interface 32
- Displaying the Online Help 32
- Common Storage Tasks 33
- 34 Getting Started 34
- Understanding RAID Concepts 35
- RAID Concepts 36
- Performance 37
- Concatenation 39
- RAID Level 0 (Striping) 40
- RAID 0 Characteristics: 41
- RAID Level 1 (Mirroring) 42
- RAID 5 Characteristics: 43
- RAID 6 Characteristics: 45
- RAID 50 Characteristics: 47
- RAID 60 Characteristics: 49
- RAID 10 Characteristics: 51
- 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 71
- PCIe SSD Sub System Health 72
- Backplanes 73
- Backplane Firmware Version 73
- Storage Properties 75
- Global Tasks 75
- Global Rescan 76
- Storage Controllers 77
- SCSI RAID Controllers 82
- CERC SATA RAID Controllers 82
- CERC ATA RAID Controllers 82
- SAS RAID Controllers 82
- RAID Controller Features 83
- Cache Policy 85
- Write Policy 86
- Disk Cache Policy 88
- Cluster-enabled Controllers 89
- Controller 90
- Non-RAID SCSI Controllers 91
- Firmware/Driver Versions 92
- Controller Health 94
- Controller Components 95
- Controller Properties 96
- 98 Controllers 98
- 100 Controllers 100
- Controller Tasks 101
- Available Reports 102
- Controllers 103 103
- Controllers 104
- Set Rebuild Rate 105
- Reset Configuration 107
- Export Log 108
- 110 Controllers 110
- Disks and Global Hot Spares 110
- Controllers 113 113
- Clear Foreign Configuration 115
- 118 Controllers 118
- 120 Controllers 120
- Set Check Consistency Rate 122
- Set Reconstruct Rate 123
- Redundant Path Configuration 124
- Set Patrol Read Mode 127
- To set the Patrol Read mode: 128
- Start and Stop Patrol Read 129
- Change Controller Properties 130
- Manage Physical Disk Power 131
- Manage Preserved Cache 134
- Manage Encryption Key 136
- Enabling LKM 137
- Manage CacheCade 139
- Resizing the CacheCade 140
- Renaming the CacheCade 140
- Deleting the CacheCade 141
- CacheCade Properties 141
- Convert to Non-RAID Disks 142
- Convert to RAID Capable Disks 143
- Patrol Read Report 143
- Check Consistency Report 143
- Slot Occupancy Report 144
- Enclosures and Backplanes 145
- Enclosure Physical Disks 146
- Enclosure Fans 146
- Enclosure Power Supplies 146
- Enclosure Temperature Probes 146
- Enclosures and Backplanes 147 147
- SMART Thermal Shutdown 148
- PowerVault 221S Enclosures 149
- Enclosure Management 149
- 152 Enclosures and Backplanes 152
- Enclosure Tasks 154
- Enclosures and Backplanes 157 157
- Enclosure Components 158
- Set Asset Data 159
- Set Temperature Probe Values 159
- Temperature Probe Status 160
- View Slot Occupancy Report 161
- EMM Properties 161
- 162 Enclosures and Backplanes 162
- Fan Properties 163
- 164 Enclosures and Backplanes 164
- Power Supply Properties 165
- 166 Enclosures and Backplanes 166
- 168 Enclosures and Backplanes 168
- Enclosures and Backplanes 169 169
- 170 Enclosures and Backplanes 170
- Connectors 171
- Connector Health 174
- Connector Information 175
- Connector Components 175
- Connector Properties 175
- 176 Connectors 176
- Logical Connector Properties 177
- Path Health 178
- Related Tasks 179
- Logical Connector Components 179
- 180 Connectors 180
- RAID Controller Batteries 181
- Battery Properties and Tasks 182
- 184 RAID Controller Batteries 184
- Battery Tasks 185
- Related information: 186
- Start Learn Cycle 186
- Battery Delay Learn Cycle 187
- Related Information: 188
- Physical Device 189
- Add a New Disk to Your System 190
- Other Disk Procedures 192
- Remove Dead Segments 201
- Prepare to Remove 201
- Initialize 202
- Rebuild 202
- Cancel Rebuild 203
- Online and Offline 204
- Revertible Hot Spare 206
- Instant Encrypt Erase 207
- Full Initialization 208
- Convert to RAID Capable Disk 209
- Convert to Non-RAID Disk 209
- Virtual Disks 211
- Virtual Disks 213 213
- Virtual Disks 215 215
- Express Wizard 217
- Creating Virtual Disks 218
- (continued) 220
- 222 Virtual Disks 222
- Recommendations 226
- Virtual Disk Properties 227
- 228 Virtual Disks 228
- Virtual Disk Tasks 230
- Virtual Disks 233 233
- Rebuild Rate 233
- Virtual Disks 237 237
- Virtual Disks 241 241
- Connector 0 245
- Physical Disks Selected 245
- Span Edit 249
- Virtual Disks 251 251
- Considerations for Format 254
- Virtual Disk Task: Delete 257
- Virtual Disk Task: Rename 258
- Split Mirror 259
- To Split a Mirror: 260
- Unmirror 261
- Required Conditions 265
- SAS Controller Conditions 266
- Moving the Disks 267
- Hot Spare 269
- CacheCade Using Solid State 277
- BIOS Terminology 279
- 280 BIOS Terminology 280
- Troubleshooting 281
- System Requirements 282
- Drivers and Firmware 282
- Isolate Hardware Problems 282
- Replacing a Failed Disk 283
- Troubleshooting 285 285
- Virtual Disk Troubleshooting 286
- Troubleshooting 287 287
- Cannot Create a Virtual Disk 289
- Management 289
- Virtual Disk Errors on Linux 289
- Troubleshooting 291 291
- “Medium” Error 293
- Format, or Other Operation 294
- Troubleshooting 295 295
- PCIe SSD Troubleshooting 297
- 298 Troubleshooting 298
- Frequently Asked Questions 299
- Physical Disk? 300
- Which Controllers do I Have? 300
- How do I Turn off an Alarm? 301
- Supported Features 303
- 304 Supported Features 304
- Connector Tasks 305
- Physical Disk Tasks 306
- 308 Supported Features 308
- Virtual Disk Specifications 309
- 310 Supported Features 310
- Supported RAID Levels 312
- Enclosure Support 321
- CERC 6/I Controllers 322
- 324 Supported Features 324
- 334 Supported Features 334
- 338 Supported Features 338
- 342 Supported Features 342
- 344 Supported Features 344
- Enclosure and Backplane Tasks 362
- 364 Supported Features 364
- Storage Components 365
- Disk are Failed or Removed 366
- Degraded 366
- Version 370
- Probe is Failed 372
- Connections to the Enclosure 372
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