Dell PowerVault MD3600i Manual do Proprietário Página 205
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Configuration: Device Mapper Multipath for Linux 205
• Failback can be slow when the host system is experiencing heavy I/O. The
problem is exacerbated if the host server is also experiencing very high
processor utilization.
• The Device Mapper Multipath service can be slow when the host system is
experiencing heavy I/O. The problem is exacerbated if the host server is
also experiencing very high processor utilization.
• If the root disk is not blacklisted in the
multipath.conf
file, a multipathing
node may be created for the root disk. The command
multipath –ll
lists vendor/product ID, which can help identify this issue.
Troubleshooting
Question Answer
How can I check if multipathd is
running?
Run the following command.
/etc/init.d/multipathd status
Why does the multipath –ll
command output not show any
devices?
First verify if the devices are discovered or not.
The command #cat /proc/scsi/scsi
displays all the devices that are already
discovered. Then verify the multipath.conf to
ensure that it is updated with proper settings.
After this, run multipath. Then run
multipath –ll, the new devices must show
up.
Why is a newly-mapped LUN not
assigned a multipathing device
node?
Run rescan_dm_devs in any directory. This
must bring up the devices.
I have no LUNs mapped before.
Then I map some LUNs. After
running rescan-scsi-bus.sh, LUN 0
doesn’t show up.
Run rescan_dm_devs instead of rescan-
scsi-bus for LUN 0 reconfiguration.
book.book Page 205 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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