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Appendix C: Multipathing on Linux
401
If the module is loaded, the system returns:
dm_multipath 215770
(or a similar message)
3. Verify that the device mapper module is loaded.
# lsmod | grep dm_mod
If the module is loaded, the system returns:
dm_mod 56537 8 dm_snapshot...
(or a similar message)
Verifying the Daemon is Running
To verify that the MP daemon is running:
1. Open a terminal window.
2. Check the daemon’s status.
# /etc/init.d/multipathd status
3. Do one of the following actions:
• If the system returns:
multipathd is running
(or a similar message)
Go to “Task 4: Create and Configure Devices” on page 402.
• If the system returns:
multipathd is stopped
(or a similar message)
Start the MP daemon.
# /etc/init.d/multipathd start
Then go to “Task 4: Create and Configure Devices” on page 402.
- E610f, E610s, E310f, E310s 1
- Copyright 2
- Trademarks 2
- Recommendations 2
- VTrak E-Class Product Manual 10
- Contents 11
- About This Manual 19
- VTrak Overview 20
- Architectural Description 22
- Features and Benefits 23
- Operational Features 24
- Management 25
- Specifications 26
- Warranty and Support 27
- BSMI Statement 27
- CE Statement 27
- FCC Statement 27
- GOST-R Statement 28
- IRAM Statement 28
- KCC Statement 28
- Chapter 2: VTrak Installation 29
- Mounting VTrak in a Rack 30
- Installing Disk Drives 33
- AAMUX Adapter 34
- WARNING: 35
- Counter-sink screws only 35
- Fibre Channel SAN 37
- Fibre Channel DAS 39
- Expansion 42
- SAS DAS 45
- SAS Cascaded Storage 47
- SAS with JBOD Expansion 50
- Data Path 51
- Management Path 51
- Connecting the Power 55
- Chapter 3: VTrak Setup 57
- VTrak Default IP Addresses 58
- Setting up VTrak with the CLI 59
- Setting up VTrak with the CLU 61
- Manual IP settings 62
- Automatic IP settings 62
- Setting Up WebPAM PROe 64
- Choosing a Language 65
- Creating a Disk Array 66
- Automatic 67
- Advanced 68
- Logging out of WebPAM PROe 70
- Logging into WebPAM PROe 72
- Perusing the Interface 75
- Using the Header 76
- Using Tree View 76
- Using Management View 77
- Viewing the Event Frame 78
- Viewing Other Subsytems 80
- Logging into a Subsystem 80
- Hiding the Other Subsystems 80
- Working with Subsystems 81
- Viewing Subsystem Information 82
- Viewing the Runtime Event Log 84
- Saving the Runtime Event Log 85
- Viewing NVRAM Events 86
- Saving NVRAM Events 87
- Running Background Activities 89
- Viewing Scheduled Activities 90
- Scheduling an Activity 90
- Deleting a Scheduled Activity 91
- Viewing Lock Status 91
- Setting the Lock 92
- Renewing the Lock 92
- Releasing the Lock 92
- Setting-up Event Notification 95
- Viewing User Sessions 98
- Logging out Other Users 99
- Port Setting Information 103
- Property Definitions 104
- Viewing SFP Information 105
- Adding an Initiator 107
- Managing SAS Connections 108
- Viewing SAS Port Statistics 109
- Viewing SAS Initiators 109
- Managing Storage Services 111
- Deleting an Initiator 112
- Viewing the LUN Map 112
- Enabling LUN Masking 112
- Adding a LUN Map 112
- Editing a LUN Map 113
- Monitoring Performance 114
- Managing Software Services 116
- Making SLP Settings 117
- Making Web Server Settings 118
- Making Telnet Settings 119
- Making SSH Settings 120
- Making SNMP Settings 120
- Managing SNMP Trap Sinks 121
- Making CIM Settings 122
- Making Netsend Settings 123
- Managing Netsend Recipients 124
- Deleting Netsend Recipients 125
- Exporting the User Database 126
- Importing a User Database 128
- Updating the Firmware 130
- Restoring Factory Defaults 132
- Clearing Statistics 133
- Shutting Down the Subsystem 135
- Starting Up After Shutdown 136
- Restarting the Subsystem 137
- Managing Controllers 138
- Adjustable items 139
- Viewing Controller Statistics 140
- Making Controller Settings 140
- Clearing an Orphan Watermark 142
- Managing Enclosures 143
- Viewing Enclosure Topology 144
- Viewing Enclosure Information 144
- Making Enclosure Settings 145
- Viewing FRU VPD Information 145
- Checking the Batteries 146
- Reconditioning a Battery 146
- Silencing the Buzzer 147
- Making Buzzer Settings 147
- Testing the Buzzer 148
- Managing Physical Drives 149
- Adjustable Items 151
- Managing UPS Units 155
- Making UPS Settings 156
- Viewing UPS Information 157
- Managing Disk Arrays 158
- Deleting a Disk Array 163
- Making Disk Array Settings 164
- Creating a Logical Drive 165
- Deleting a Logical Drive 166
- Migrating a Disk Array 166
- Rebuilding a Disk Array 167
- Rebuilding Manually 168
- Running PDM on a Disk Array 169
- Transitioning a Disk Array 169
- Managing Logical Drives 171
- Making Logical Drive Settings 173
- Initializing a Logical Drive 174
- Running Redundancy Check 174
- Table Definitions 176
- LUN Mapping Parameters 177
- Managing Spare Drives 178
- Creating a Spare Drive 179
- Deleting Spare Drive 180
- Making Spare Drive Settings 180
- Running Spare Check 181
- Initial Connection 184
- Making a Telnet Connection 185
- Making a SSH Connection 185
- Logging In 186
- Accessing Online Help 187
- Exiting the CLU 187
- Logging Out of the CLI 188
- Running Quick Setup 189
- Managing the Subsystem 190
- Running Media Patrol 191
- Making NTP Settings 192
- Managing the Controllers 194
- Locating the Controller 196
- Managing the Enclosure 197
- Viewing Power Supply Status 198
- Locating a Power Supply 199
- Viewing Cooling Unit Status 199
- Viewing Voltage Sensor Status 200
- Locating an Enclosure 201
- Setting an Alias 205
- Locating a Physical Drive 206
- Disk Array Operational Status 212
- Accepting an Incomplete Array 213
- Running PDM 215
- Locating a Disk Array 216
- Deleting a Spare Drive 221
- Locating a Logical Drive 225
- Making Automatic Settings 226
- Making Manual Settings 226
- Viewing Node Information 228
- Adding a SAS Initiator 233
- Managing Background Activity 234
- Working with the Event Viewer 236
- Clearing NVRAM Events 237
- Working with LUN Mapping 238
- Mapping a LUN to an Initiator 239
- Managing Users 243
- Changing Your Own Password 245
- Deleting a User 246
- Making Email Settings 247
- Making Webserver Settings 248
- Flashing through TFTP 255
- Chapter 6: Maintenance 267
- Replacing a Power Supply 277
- Replacing a Cache Battery 283
- Removing the old controller 287
- Installing the new controller 287
- Introduction to RAID 291
- RAID 0 – Stripe 292
- RAID 1 – Mirror 293
- RAID 1E – Enhanced Mirror 294
- RAID 10 – Mirror + Stripe 297
- RAID 50 Axles 299
- RAID 60 Axles 301
- Choosing a RAID Level 302
- Choosing Stripe Size 305
- Choosing Sector Size 305
- Cache Policy 306
- Read Cache Policy 307
- Write Cache Policy 307
- Adaptive Writeback Cache 307
- Cache Mirroring 308
- LUN Affinity 309
- Logical Drive Settings 310
- Failover and Failback 310
- Capacity Coercion 311
- Initialization 311
- Hot Spare Drive(s) 312
- RAID Level Migration 312
- Media Patrol 319
- PDM Triggers 320
- Transition 321
- Automatic Transition 323
- Manual Transition 323
- Chapter 8: Troubleshooting 325
- LEDs Display Amber or Red 327
- Drive Status Indicators 328
- Back of Enclosure 328
- CLU Reports a Problem 333
- Checking a Reported Component 334
- WebPAM PROe Reports a Problem 336
- Figure 13.The Event Log 337
- Event Notification Response 339
- When a Physical Drive Fails 357
- With a Hot Spare Drive 357
- Without a Hot Spare Drive 358
- Rebuild Operation 358
- Incomplete Array 360
- Physical Drive Problems 361
- Enclosure Problems 363
- Serial Connection 367
- Telnet Connection 368
- Connection Problems 369
- Fibre Channel Connections 370
- SAS Connections 371
- Chapter 9: Support 375
- Contacting Technical Support 377
- The Netherlands 378
- Attn: Technical Support 379
- Limited Warranty 380
- Your Responsibilities 381
- SNMP MIB Files 385
- Adding a Second Controller 385
- Before You Begin 389
- Installing PerfectPath 390
- Verifying Installation 391
- Running Perfect Path View 393
- Viewing LUN Properties 394
- Viewing Path Properties 396
- Viewing Events 399
- Clearing Path Statistics 399
- Features and Settings 400
- Load Balance Policy 401
- Path Verification 402
- PDO Removal 403
- Performance Tab Refresh Rate 404
- Round Robin Count 404
- Refreshing the Objects 405
- Viewing System Information 405
- Saving System Information 406
- Troubleshooting 407
- Updating PerfectPath 408
- Repairing PerfectPath 409
- Removing PerfectPath 410
- Installing Packages 413
- Verifying Packages – RedHat 413
- Verifying Packages – SuSE 414
- RedHat Systems 416
- SuSE Systems 416
- Editing a Configuration File 416
- Task 5: Setting-up ALUA 421
- SuSE Linux SLES 11 422
- Linux MPIO: Known Issues 424
- Sample multipath.conf File 425
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