Dell PowerVault MD3600i Bedienungshandbuch Seite 36
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36 Planning: RAID Controller Modules
Write-Through Cache
In write-through cache, data is written to the physical disk before completion
status is returned to the host operating system. Write-through cache is
considered more robust than write-back cache, since a power failure is less
likely to cause loss of data. The RAID controller automatically switches to
write-through if either cache mirroring is disabled or the battery is missing or
there is a fault condition.
book.book Page 36 Tuesday, September 27, 2011 3:13 PM
- Red Hat Secure Web Server 0
- Installing Your Apache 4
- 1.1 OS and Software Versions 5
- 1.2 Mounting the CD-ROM 6
- 1.3 Optional Packages 6
- 1.3.1 Analog 7
- 1.3.2 mod perl 7
- 1.3.3 PHP3 and PHP/FI 8
- 1.3.5 Devel 9
- 1.3.4 Apache-ASP 9
- 1.3.6 Source 10
- 1.3.7 Squid 10
- 1.3.8 Squid-novm 11
- 1.3.9 ht://Dig 11
- 1.4 Running the Installer 12
- 1.4 Running the Installer 13 17
- Configuring Your Secure 19
- Web Server 19
- 2.1 Apache Configuration 20
- 2.2 httpd.conf 21
- Contents 24
- 2.3 srm.conf 32
- 2.4 access.conf 38
- #AddModule mod_mime_magic.c 41
- AddModule mod_mime_magic.c 41
- 2.6 Using Virtual Hosts 42
- Port 443 44
- Listen 80 44
- #Listen 80 44
- Introduction 46
- Listen 12331 47
- /etc/rc.d/init.d/httpsd stop 47
- /etc/rc.d/init.d/httpsd start 47
- 2.8 Accessing Your Server 49
- Securing Your Server 50
- 3.1 How Server Security Works 51
- We Need Feedback! 57
- 3.4.1 Generating a Key 58
- 3.5 Getting a Test Certificate 62
- 3.7 Buying a Certificate 67
- 64 Securing Your Server 73
- 3.7 Buying a Certificate 65 74
- Figure 3.3: Application 74
- 66 Securing Your Server 75
- 3.7 Buying a Certificate 67 76
- 68 Securing Your Server 77
- 3.7 Buying a Certificate 69 78
- 70 Securing Your Server 80
- 3.7 Buying a Certificate 71 81
- 72 Securing Your Server 82
- 3.7 Buying a Certificate 73 83
- 74 Securing Your Server 84
- 3.7 Buying a Certificate 75 85
- 76 Securing Your Server 86
- Configuring Optional 87
- Packages 87
- 4.2 Configuring mod perl 88
- Acknowledgements 90
- 4.3 Configuring mod php 92
- 4.4 Configuring Apache-ASP 94
- 4.5 Configuring Squid 94
- 4.6 Configuring ht://Dig 97
- Figure 1 Emergency Stop 107
- • immediately foll 113
- 2 millirem / hour 114
- 100 millirem / 7 days 114
- 500 millirem / year 114
- During manufacturing 115
- At the user’s facility 115
- High Voltage Subsystem 116
- Power Distribution Unit (PDU) 117
- Figure 2: Moving the system 128
- Figure 3: System dimensions 129
- Use these alignment marks 132
- (left side shown) 132
- Figure 5: Height setup 133
- Figure 6: Height adjustment 133
- Figure 8: Stage release 136
- Figure 9: Lead panels 137
- Agilent x6000 138
- Figure 15: AC power cable 141
- Air input assembly 143
- Air input 143
- (80 - 125 PSI) 143
- • every six (6) months 153
- Figure 26: IRP cover 158
- To Downstream Machine 163
- From Upstream Machine 163
- PCA Flow 164
- SMEMA Connectors 165
- POWER DISTRIBUTION UNIT 168
- Chassis Ground 170
- Main Cabinet GND 171
- PDU Outlets 171
- Agilent Address 177
- Dell PowerVault MD3600i and 179
- MD3620i Storage Arrays 179
- 10 Contents 180
- Using the Mappings Tab 181
- Defining a Host 182
- Removing Host Access 183
- Managing Host Groups 184
- Removing a Host Group 186
- Host Topology 186
- I/O Data Path Protection 188
- Virtual Disks 193
- Creating Disk Groups 194
- Locating a Disk Group 196
- Creating Virtual Disks 196
- 12 Contents 202
- Changing the I/O Type 203
- 512 KB) 204
- Creating a Security Key 207
- Changing a Security Key 209
- Saving a Security Key 211
- Validate Security Key 212
- Erasing Secure Physical Disks 214
- Hot Spares and Rebuild 216
- Global Hot Spares 216
- Hot Spare Operation 217
- Hot Spare Drive Protection 217
- Enclosure Loss Protection 218
- Host-to-Virtual Disk Mapping 219
- 16 Management: Installing 224
- Operating System Highest LUN 228
- Linux 255 228
- Disk Group 229
- Storage Partitioning 232
- Disk Group Expansion 233
- Virtual Disk Expansion 234
- Using Free Capacity 234
- Using Unconfigured Capacity 234
- Disk Group Migration 236
- Import Disk Group 237
- Solid State Disks (SSDs) 238
- Changing Media Scan Settings 239
- Suspending the Media Scan 240
- Snapshot Virtual Disks 241
- Icon Description 244
- Simple Path 245
- 16 Contents 246
- Advanced Path 249
- Capacity option is disabled 256
- Snapshot Rollback 262
- Command Line Options 263
- Starting a Snapshot Rollback 264
- Resuming a Snapshot Rollback 265
- Canceling a Snapshot Rollback 265
- Virtual Disk Copy 267
- Types of Virtual Disk Copies 269
- Online Copy 270
- Creating a Virtual Disk Copy 273
- Create Copy Wizard 274
- Failed Virtual Disk Copy 274
- Failed RAID Controller Module 275
- Copy Manager 275
- Copying the Virtual Disk 275
- Setting Copy Priority 277
- Stopping a Virtual Disk Copy 278
- Recopying a Virtual Disk 280
- Re-Copying the Virtual Disk 281
- Removing Copy Pairs 282
- Configuration: Device Mapper 285
- Multipath for Linux 285
- Using DM Multipathing Devices 286
- Window (EMW) 287
- Notes, Cautions, and Warnings 290
- Ready For Use 293
- Limitations and Known Issues 296
- Troubleshooting 297
- from DM 298
- Firmware 300
- EMM Firmware 308
- Technology (SMART) 309
- Management: Installing Array 312
- Components 312
- Front Bezel (Optional) 314
- Hard Drives 315
- Installing a Hard-Drive Blank 316
- Removing a Hard Drive 316
- Installing a Hard Drive 318
- RAID Controller Module 321
- Overview 324
- 1 control panel 2 release tab 332
- 1 release pin 2 control panel 333
- Backplane 334
- Hardware Features 335
- Installing the Backplane 338
- Management: System Interfaces 341
- Array Software 343
- Storage Array Support Data 348
- Retrieving Trace Buffers 349
- Collecting Physical Disk Data 351
- Event Log 352
- Recovery Guru 353
- Storage Array Profile 353
- Finding Nodes 356
- Using Go To 358
- Condition 359
- Locating a Physical Disk 362
- SMrepassist Utility 365
- Unidentified Devices 366
- Software 370
- Troubleshooting: Your Array 372
- Management Modules 374
- Troubleshooting Hard Drives 377
- Connections 378
- Hard-Drive Indicator Patterns 379
- Conditions 381
- Invalid Storage Array 381
- ECC Errors 381
- Getting Help 383
- Index 285 385
- Index 286 386
- Index 287 387
- Index 288 388
- Index 289 389
- Index 290 391
- Index 291 392
- 292 Index 393
- RAID Controller Modules 396
- Battery Backup Unit 399
- Cache Functions and Features 400
- Write-Through Cache 401
- Array Terms and Concepts 402
- Physical Disks 403
- Physical Disk States 403
- Virtual Disks and Disk Groups 404
- 4 Contents 405
- Virtual Disk States 406
- RAID Levels 407
- Segment Size 409
- Virtual Disk Operations 409
- Consistency Check 410
- Media Verification 410
- Cycle Time 410
- Disk Group Operations 411
- Segment Size Migration 412
- Disk Group Defragmentation 413
- Disk Group Operations Limit 413
- Disk Migration 414
- Disk Roaming 417
- Advanced Features 418
- Virtual Disk Recovery 420
- Multi-Path Software 421
- Virtual Disk Ownership 422
- Load Balancing 423
- 6 Configuration: About Your 427
- Configuration: Overview 429
- Configuration: Overview 63 431
- Configuration: Overview 65 433
- Out-of-Band Management 435
- Storage Arrays 436
- Setting Up Your Storage Array 439
- Locating Storage Arrays 441
- Setting a Password 442
- Password Guidelines 443
- Removing Storage Arrays 445
- Enabling Premium Features 445
- Displaying Failover Alert 446
- Configuring E-mail Alerts 448
- 8 Contents 449
- Configuring SNMP Alerts 452
- Battery Settings 453
- Configuration: Using iSCSI 457
- Initiator CHAP Secret 459
- Target CHAP Secret 459
- Statistics 466
- Configuration: Event Monitor 468
- Configuring Host Access 470
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