Dell OpenManage Server Administrator Version 7.0 Manual de usuario Pagina 54
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54 Understanding RAID Concepts
Table 3-1. RAID Level and Concatenation Performance Comparison
RAID
Level
Data
Availability
Read
Performance
Write
Performance
Rebuild
Performance
Minimum
Disks
Required
Suggested
Uses
Concatenation No gain No gain No gain N/A 1 or 2
depending
on the
controller.
More cost
efficient
than
redundant
RAID levels.
Use for
noncritical
data.
RAID 0 None Very Good Very Good N/A N Noncritical
data
RAID 1 Excellent Very Good Good Good 2N
(N = 1)
Small
databases,
database
logs, critical
information
RAID 5 Good Sequential
reads: good.
Trans ac ti on
al reads:
Very good
Fair, unless
using write-
back cache
Fair N + 1
(N = at
least two
disks)
Databases
and other
read-
intensive
transactional
uses
RAID 10 Excellent Very Good Fair Good 2N x X Data-
intensive
environment
s (large
records)
RAID 50 Good Very Good Fair Fair N + 2
(N = at
least 4)
Medium-
sized
transactional
or data-
intensive
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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