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Configuration: Device Mapper Multipath for Linux 219
14
Configuration: Device Mapper
Multipath for Linux
Overview
The MD3600f Series storage array uses a Linux operating system software
framework, known as Device Mapper (DM), to enable multipath capabilities
on Linux Host Servers. The DM multipath functionality is provided by a
combination of drivers and utilities. This chapter describes how to use those
utilities to complete the process of enabling an MD3600f Series storage array
on a Linux system.
NOTE: The Device Mapper technology replaces an earlier, proprietary technology,
known as MPP. MPP was used to enable multipathing for a previous MD
generation, the MD3000 Series of storage arrays.
NOTE: The required Device Mapper software components are installed on a Linux
host server by running the MD3600f Series Resource media installation program on
the server, and selecting either the Full or Host install option. For detailed
installation procedures, see the
Dell PowerVault MD3600f and MD3620f storage
arrays Deployment Guide
at dell.com/support/manuals.
Benefits of using DM Multipath include:
• Detects path failure and re-routes I/O to other available paths
• Revalidates failed paths after path restoration
• Utilizes multiple available paths to maximize performance
• Reconfigures path usage based on path states and error conditions
• Unifies multiple device nodes into a single logical multipath device node
• Indentifies a new multipathed LU and automatically configures a new
multipath node
• Provides device name persistency for DM devices under /dev/mapper/
book.book Page 219 Tuesday, June 18, 2013 3:03 PM
- Owner’s Manual 1
- Notes, Cautions, and Warnings 2
- Contents 3
- 4 Contents 4
- 6 Configuration: About Your 6
- 8 Contents 8
- 10 Configuration: Premium 10
- 11 Configuration: Premium 11
- Upgrading to 12
- 14 Contents 14
- 15 Management: Firmware 15
- 16 Contents 16
- 18 Contents 18
- 20 Contents 20
- Introduction 21
- Series Storage Array 22
- 24 Introduction 24
- Overview 25
- Hardware Features 26
- Hard–Drive Indicator Patterns 30
- RAID Controller Modules 33
- Battery Backup Unit 36
- Cache Functions and Features 37
- Write–Back Cache 38
- Write–Through Cache 38
- Array Terms and Concepts 41
- Physical Disks 42
- Physical Disk States 42
- Virtual Disks and Disk Groups 43
- Virtual Disk States 44
- RAID Levels 45
- Segment Size 47
- Virtual Disk Operations 47
- Background Initialization 48
- Foreground Initialization 48
- Consistency Check 48
- Media Verification 48
- Cycle Time 49
- Virtual Disk Operations Limit 49
- Disk Group Operations 50
- Disk Group Defragmentation 51
- Disk Group Operations Limit 51
- Disk Migration 53
- Advanced Features 55
- Host Types 56
- Virtual Disk Recovery 58
- Multi-Path Software 59
- Load Balancing 60
- Configuration: Overview 65
- Enterprise Management Window 66
- Array Management Window 67
- Out-of-Band Management 69
- In-Band Management 69
- Storage Arrays 70
- Setting Up Your Storage Array 72
- Locating Storage Arrays 73
- Setting a Password 75
- Password Guidelines 76
- Removing Storage Arrays 77
- Enabling Premium Features 78
- Failover Alert Display 78
- Configuring E–mail Alerts 81
- Configuring SNMP Alerts 83
- Battery Settings 85
- Configuration: Event Monitor 87
- Configuring Host Access 89
- Using the Mappings Tab 90
- Removing Host Access 92
- Managing Host Groups 92
- Creating a Host Group 93
- Removing a Host Group 94
- Host Topology 95
- I/O Data Path Protection 96
- Virtual Disks 101
- Creating Disk Groups 102
- Locating a Disk Group 104
- Creating Virtual Disks 104
- Changing the I/O Type 110
- 512 KB) 111
- Creating a Security Key 114
- Changing a Security Key 116
- Saving a Security Key 117
- Validate Security Key 118
- Erasing Secure Physical Disks 119
- Hot Spares and Rebuild 122
- Global Hot Spares 122
- Hot Spare Operation 122
- Enclosure Loss Protection 123
- Host-to-Virtual Disk Mapping 125
- Restricted Mappings 132
- Disk Group 134
- Storage Partitioning 137
- Disk Group Expansion 138
- Virtual Disk Expansion 139
- Using Free Capacity 139
- Disk Group Migration 140
- Import Disk Group 141
- Importing a Disk Group 142
- Storage Array Media Scan 143
- Suspending the Media Scan 144
- Snapshot Virtual Disks 145
- Simple Path 148
- About the Simple Path 149
- Advanced Path 152
- Snapshot Repository Capacity 159
- PowerVault Modular 162
- Snapshot Rollback 164
- Starting a Snapshot Rollback 166
- Resuming a Snapshot Rollback 167
- Canceling a Snapshot Rollback 168
- Virtual Disk Copy 171
- Types of Virtual Disk Copies 172
- Online Copy 173
- Creating a Virtual Disk Copy 176
- Create Copy Wizard 177
- Failed Virtual Disk Copy 177
- Failed RAID Controller Module 178
- Copy Manager 178
- Copying the Virtual Disk 179
- Setting Copy Priority 180
- Stopping a Virtual Disk Copy 181
- Recopying a Virtual Disk 181
- Re-Copying a Virtual Disk 183
- Removing Copy Pairs 184
- Remote Replication 185
- Switch Cascading 190
- Prerequisites 191
- Replication Virtual Disks 192
- Storage Array 192
- Existing Disk Group 193
- Creating a Remote Replication 194
- Setting the Write Mode 195
- Repository Virtual Disk 198
- Viewing the Properties Pane 200
- Virtual Disk 201
- Virtual Disk Status Icons 202
- Unsynchronized Virtual Disks 207
- Resuming a Remote Replication 211
- Configuration: Device Mapper 219
- Multipath for Linux 219
- Using DM Multipathing Devices 220
- Ready for Use 224
- command 225
- Limitations and Known Issues 227
- Troubleshooting 228
- Packages 229
- Firmware 230
- EMM Firmware 237
- Technology (SMART) 238
- Management: Installing Array 241
- Components 241
- Front Bezel (Optional) 242
- Hard Drives 243
- Installing a Hard-Drive Blank 244
- Removing a Hard Drive 244
- Installing a Hard Drive 246
- RAID Controller Module 249
- Control Panel 259
- 1 control panel 2 release tab 260
- Installing the Control Panel 261
- Backplane 262
- Installing the Backplane 265
- Management: System Interfaces 269
- Array Software 271
- Storage Array Support Data 274
- Event Log 277
- Recovery Guru 278
- Storage Array Profile 278
- Finding Nodes 281
- Using Go To 283
- Condition 284
- Locating a Physical Disk 287
- SMrepassist Utility 289
- Unidentified Devices 290
- Software 293
- Troubleshooting: Your Array 295
- Management Modules 300
- Troubleshooting Hard Drives 302
- Connections 303
- Conditions 306
- PCI Errors 307
- Critical Conditions 307
- Noncritical Conditions 307
- Getting Help 309
- Documentation Feedback 310
- Index 311 311
- Index 312 312
- Index 313 313
- Index 314 314
- Index 315 315
- Index 316 316
- Index 317 317
- 318 Index 318
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