Dell PowerVault MD3220i El manual del propietario Pagina 198
- Pagina / 282
- Tabla de contenidos
- SOLUCIÓN DE PROBLEMAS
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
198 Configuration: Device Mapper Multipath for Linux
• After a failed path is restored on an MD3600i Series array, failback does not
occur automatically because the driver cannot auto-detect devices without
a forced rescan. Run the command
rescan_dm_devs
to force a rescan
of the host server. This restores the failed paths enabling failback to occur.
• 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 198 Saturday, September 24, 2011 9:06 AM
- Owner’s Manual 1
- Notes, Cautions, and Warnings 2
- Contents 3
- 4 Contents 4
- 6 Configuration: About Your 6
- 8 Contents 8
- 11 Configuration: Premium 10
- 12 Configuration: Premium 11
- Feature—Virtual Disk Copy 11
- 12 Contents 12
- 14 Contents 14
- 16 Contents 16
- 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
- Cache Functions and Features 35
- Write-Through Cache 36
- Array Terms and Concepts 37
- Physical Disk States 38
- Virtual Disks and Disk Groups 39
- RAID Levels 40
- RAID Level Usage 41
- Segment Size 42
- Virtual Disk Operations 43
- Consistency Check 44
- Media Verification 44
- Cycle Time 44
- Disk Group Operations 45
- Disk Group Defragmentation 46
- 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 76
- Configuring SNMP Alerts 79
- Battery Settings 80
- Configuration: Using iSCSI 83
- Creating CHAP Secrets 84
- Initiator CHAP Secret 85
- Target CHAP Secret 85
- Statistics 91
- 92 Configuration: Using iSCSI 92
- Configuration: Event Monitor 93
- Configuring Host Access 95
- Using the Mappings Tab 96
- Removing Host Access 98
- Managing Host Groups 98
- Adding a Host to a Host Group 99
- Removing a Host Group 100
- Host Topology 100
- I/O Data Path Protection 102
- Virtual Disks 105
- Creating Disk Groups 106
- Locating a Disk Group 108
- Creating Virtual Disks 108
- Changing the I/O Type 114
- Creating a Security Key 118
- Changing a Security Key 119
- Saving a Security Key 121
- Validate Security Key 122
- Erasing Secure Physical Disks 122
- Hot Spares and Rebuild 125
- Global Hot Spares 125
- Hot Spare Operation 125
- Enclosure Loss Protection 126
- Host-to-Virtual Disk Mapping 128
- Restricted Mappings 136
- Disk Group 137
- Storage Partitioning 140
- Disk Group Expansion 141
- Virtual Disk Expansion 142
- Using Free Capacity 142
- Using Unconfigured Capacity 142
- Disk Group Migration 143
- Import Disk Group 144
- Storage Array Media Scan 145
- Changing Media Scan Settings 146
- Suspending the Media Scan 147
- Snapshot Virtual Disks 149
- Simple Path 152
- About the Simple Path 153
- Advanced Path 156
- Snapshot Repository Capacity 162
- Capacity option is disabled 163
- Snapshot Rollback 167
- Starting a Snapshot Rollback 169
- Resuming a Snapshot Rollback 170
- Canceling a Snapshot Rollback 171
- Virtual Disk Copy 173
- Types of Virtual Disk Copies 174
- Online Copy 175
- Creating a Virtual Disk Copy 178
- Create Copy Wizard 179
- Failed Virtual Disk Copy 179
- Failed RAID Controller Module 180
- Copy Manager 180
- Copying the Virtual Disk 180
- Setting Copy Priority 182
- Stopping a Virtual Disk Copy 183
- Recopying a Virtual Disk 183
- Re-Copying a Virtual Disk 185
- Removing Copy Pairs 186
- Configuration: Device Mapper 189
- Multipath for Linux 189
- Using DM Multipathing Devices 190
- Ready For Use 194
- Limitations and Known Issues 197
- Troubleshooting 198
- Packages 201
- Firmware 202
- EMM Firmware 208
- Technology (SMART) 210
- Management: Installing Array 211
- Components 211
- Front Bezel (Optional) 212
- Hard Drives 213
- Installing a Hard-Drive Blank 214
- Removing a Hard Drive 214
- Installing a Hard Drive 216
- RAID Controller Module 219
- Control Panel 229
- Installing the Control Panel 230
- Backplane 231
- Installing the Backplane 234
- Management: System Interfaces 237
- Array Software 239
- Storage Array Support Data 242
- Event Log 244
- Recovery Guru 245
- Storage Array Profile 246
- Finding Nodes 248
- Using Go To 250
- Condition 251
- Locating a Physical Disk 253
- SMrepassist Utility 257
- Unidentified Devices 258
- Software 260
- Troubleshooting: Your Array 263
- Management Modules 265
- Troubleshooting Hard Drives 268
- Connections 269
- Conditions 271
- Invalid Storage Array 271
- ECC Errors 271
- PCI Errors 272
- Critical Conditions 272
- Noncritical Conditions 272
- Getting Help 273
- 274 Getting Help 274
- Index 275 275
- Index 276 276
- Index 277 277
- Index 278 278
- Index 279 279
- Index 280 280
- Index 281 281
- 282 Index 282
Relacionado con productos y manuales para Arrays de discos Dell PowerVault MD3220i
Arrays de discos Dell MD1120 Especificaciones
(23 paginas)
(23 paginas)
Arrays de discos Dell H810 Manual de usuario
(26 paginas)
(26 paginas)
Arrays de discos Dell DCL and 3 Guía de usuario
(254 paginas)
(254 paginas)
Arrays de discos Dell DCL and 3 Guía de usuario
(37 paginas)
(37 paginas)
Arrays de discos Dell UCS-51 Guía de usuario
(68 paginas)
(68 paginas)
© 2020, manymanuals.es. Todos los derechos reservados | 0.060 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentarios a estos manuales