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186 Configuration: Device Mapper Multipath for Linux
Table 13-1. Device Mapper Commands
Command Descriptions
multipath -h Prints usage information
multipath -ll Displays the current multipath topology using all
available information (sysfs, the device mapper,
path checkers, and so on)
multipath Re-aggregates multipathing device with
simplified output.
multipath -f
<multipath_dev_node>
Flushes out Device Mapper for the specified
multipathing device. Used if the underlying
physical devices are deleted/unmapped.
multipath -F Flushes out all unused multipathing device maps.
rescan_dm_devs Dell provided script. Forces a rescan of the host's
SCSI bus and aggregates multipathing devices as
needed. For use when:
• LUNs are dynamically mapped to the hosts.
• New targets are added to the host.
• Failback of the storage array is required.
book.book Page 186 Tuesday, June 18, 2013 2:53 PM
- Owner’s Manual 1
- Notes, Cautions, and Warnings 2
- Contents 3
- 4 Contents 4
- 6 Configuration: About Your 6
- Virtual Disks 7
- 8 Contents 8
- 10 Contents 10
- 12 Contents 12
- Array Software 14
- 16 Contents 16
- Contents 17 17
- Contacting Dell 17
- 18 Contents 18
- Introduction 19
- Series Storage Array 20
- Introduction 21 21
- 22 Introduction 22
- Overview 23
- Hardware Features 24
- Hard-Drive Indicator Patterns 28
- RAID Controller Modules 31
- Battery Backup Unit 34
- System Password Reset 35
- Cache Functions and Features 36
- Array Terms and Concepts 37
- Physical Disks 38
- Physical Disk States 38
- Virtual Disks and Disk Groups 39
- RAID Levels 40
- RAID Level Usage 41
- Segment Size 43
- Virtual Disk Operations 43
- Consistency Check 44
- Media Verification 44
- Cycle Time 44
- Disk Group Operations 45
- Disk Group Defragmentation 47
- Disk Group Operations Limit 47
- Disk Migration 48
- Advanced Features 50
- Host Types 51
- Multi-Path Software 54
- Virtual Disk Ownership 55
- Load Balancing 56
- Configuration: Overview 61
- Enterprise Management Window 62
- Array Management Window 63
- Out-of-Band Management 65
- Storage Arrays 66
- Setting Up Your Storage Array 68
- Locating Storage Arrays 69
- Setting a Password 71
- Password Guidelines 72
- Removing Storage Arrays 73
- Enabling Premium Features 74
- Failover Alert Display 74
- Configuring E-mail Alerts 77
- Configuring SNMP Alerts 79
- Battery Settings 81
- Configuration: Event Monitor 83
- Configuring Host Access 85
- Using the Mappings Tab 86
- Removing Host Access 88
- Managing Host Groups 88
- Adding a Host to a Host Group 89
- Removing a Host Group 90
- Host Topology 90
- I/O Data Path Protection 92
- Creating Disk Groups 96
- Locating a Disk Group 98
- Creating Virtual Disks 98
- Changing the I/O Type 104
- 512 KB) 105
- Creating a Security Key 108
- Changing a Security Key 110
- Saving a Security Key 111
- Validate Security Key 112
- Erasing Secure Physical Disks 113
- Hot Spares and Rebuild 115
- Global Hot Spares 116
- Hot Spare Operation 116
- Hot Spare Drive Protection 116
- Enclosure Loss Protection 117
- Host-to-Virtual Disk Mapping 119
- Restricted Mappings 126
- Disk Group 127
- Storage Partitioning 130
- Disk Group Expansion 131
- Virtual Disk Expansion 132
- Using Free Capacity 132
- Disk Group Migration 133
- Import Disk Group 134
- Non-Importable Components 135
- Storage Array Media Scan 136
- Suspending the Media Scan 137
- Snapshot Virtual Disks 139
- Simple Path 142
- About the Simple Path 143
- Advanced Path 146
- Snapshot Repository Capacity 152
- Capacity option is disabled 153
- PowerVault Modular 155
- Snapshot Rollback 157
- Starting a Snapshot Rollback 159
- Resuming a Snapshot Rollback 160
- Canceling a Snapshot Rollback 161
- Virtual Disk Copy 163
- Types of Virtual Disk Copies 164
- Online Copy 165
- Creating a Virtual Disk Copy 168
- Create Copy Wizard 169
- Failed Virtual Disk Copy 169
- Failed RAID Controller Module 170
- Copy Manager 170
- Copying the Virtual Disk 171
- Setting Copy Priority 173
- Stopping a Virtual Disk Copy 173
- Recopying a Virtual Disk 174
- Re-Copying a Virtual Disk 175
- Removing Copy Pairs 176
- Configuration: Device Mapper 179
- Multipath for Linux 179
- Using DM Multipathing Devices 180
- Ready for Use 184
- Limitations and Known Issues 187
- Troubleshooting 188
- Packages 189
- Firmware 190
- EMM Firmware 197
- Technology (SMART) 198
- Management: Installing Array 201
- Components 201
- Front Bezel (Optional) 202
- Hard Drives 203
- Installing a Hard-Drive Blank 204
- Removing a Hard Drive 204
- Installing a Hard Drive 206
- RAID Controller Module 209
- Control Panel 218
- 1 control panel 2 release tab 219
- Installing the Control Panel 220
- Backplane 221
- Installing the Backplane 224
- Management: System Interfaces 227
- Storage Array Support Data 232
- Event Log 234
- Recovery Guru 235
- Storage Array Profile 236
- Finding Nodes 239
- Using Go To 240
- Condition 241
- Locating a Physical Disk 244
- SMrepassist Utility 247
- Unidentified Devices 248
- Software 251
- Troubleshooting: Your Array 253
- Management Modules 255
- Troubleshooting Hard Drives 258
- Connections 259
- Conditions 261
- Invalid Storage Array 262
- ECC Errors 262
- PCI Errors 262
- Critical Conditions 262
- Noncritical Conditions 263
- Getting Help 265
- Documentation Feedback 266
- Index 267 267
- Index 268 268
- Index 269 269
- Index 270 270
- Index 271 271
- Index 272 272
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