Dell PowerVault MD3220i Manual de usuario Pagina 185
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Configuration: Device Mapper Multipath for Linux 185
• I/O may hang when a Device Mapper device is deleted before the volume
is unmounted.
• If the scsi_dh_rdac module is not included in initrd, slower device
discovery may be seen and the syslog may become populated with buffer
I/O error messages.
• I/O may hang if the host server or storage array is rebooted while I/O is
active. All I/O to the storage array should be stopped before shutting down
or rebooting the host server or storage array.
• With the MD3200i Series array, after a failed path is restored, 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
CPU 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 CPU 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
book.book Page 185 Wednesday, May 26, 2010 2:14 PM
- Owner’s Manual 1
- Notes, Cautions, and Warnings 2
- Contents 3
- 4 Contents 4
- 6 Configuration: About Your 6
- 8 Contents 8
- 10 Contents 10
- 12 Contents 12
- 16 Management: Installing 13
- 14 Contents 14
- 16 Contents 16
- Contents 17 17
- 18 Contents 18
- Introduction 19
- Dell PowerVault MD3200i 20
- Series Storage Array 20
- Introduction 21 21
- 22 Introduction 22
- Overview 23
- Hardware Features 24
- Hard-Drive Indicator Patterns 28
- Power Indicator Codes 30
- 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
- Media Verification 44
- Cycle Time 44
- Virtual Disk Operations Limit 44
- Disk Group Operations 45
- Disk Group Defragmentation 46
- Disk Group Operations Limit 46
- Disk Migration 48
- Advanced Features 50
- Host Types 51
- Virtual Disk Recovery 53
- Multi-Path Software 54
- Load Balancing 55
- Configuration: Overview 59
- Enterprise Management Window 60
- Array Management Window 61
- Out-of-Band Management 63
- Storage Arrays 64
- Setting Up Your Storage Array 66
- Locating Storage Arrays 67
- Setting a Password 69
- Password Guidelines 70
- Removing Storage Arrays 71
- Enabling Premium Features 72
- Failover Alert Display 72
- Configuring E-mail Alerts 74
- Configuring SNMP Alerts 77
- Battery Settings 78
- Configuration: Using iSCSI 81
- Creating CHAP Secrets 82
- Initiator CHAP Secret 83
- Target CHAP Secret 83
- Statistics 89
- 90 Configuration: Using iSCSI 90
- Configuration: Event Monitor 91
- Configuring Host Access 93
- Using the Mappings Tab 94
- Removing Host Access 96
- Managing Host Groups 96
- Adding a Host to a Host Group 97
- Removing a Host Group 98
- Host Topology 98
- I/O Data Path Protection 100
- Virtual Disks 103
- Creating Disk Groups 104
- Locating a Disk Group 106
- Creating Virtual Disks 106
- Changing the I/O Type 112
- Creating a Security Key 116
- Changing a Security Key 117
- Saving a Security Key 119
- Erasing Secure Physical Disks 120
- Hot Spares and Rebuild 123
- Global Hot Spares 123
- Hot Spare Operation 123
- Hot Spare Drive Protection 123
- Enclosure Loss Protection 124
- Host-to-Virtual Disk Mapping 126
- Restricted Mappings 132
- Disk Group 133
- Storage Partitioning 136
- Disk Group Expansion 137
- Virtual Disk Expansion 138
- Using Free Capacity 138
- Using Unconfigured Capacity 138
- Disk Group Migration 139
- Import Disk Group 140
- Storage Array Media Scan 141
- Changing Media Scan Settings 142
- Suspending the Media Scan 143
- Snapshot Virtual Disks 145
- Simple Path 146
- Advanced Path 149
- Snapshot Repository Capacity 156
- Virtual Disk Copy 163
- Creating a Virtual Disk Copy 166
- Before you Begin 167
- Create Copy Wizard 167
- Failed RAID Controller Module 168
- Copy Manager 169
- Copying the Virtual Disk 169
- Setting Copy Priority 170
- Stopping a Virtual Disk Copy 171
- Recopying a Virtual Disk 172
- Recopying the Virtual Disk 173
- Removing Copy Pairs 174
- Configuration: Device Mapper 177
- Multipath for Linux 177
- Using DM Multipathing Devices 178
- Ready For Use 182
- Limitations and Known Issues 184
- Troubleshooting 185
- Packages 187
- Firmware 188
- EMM Firmware 194
- Technology (SMART) 196
- Management: Installing Array 197
- Components 197
- Front Bezel (Optional) 198
- Hard Drives 199
- Installing a Drive Blank 200
- Removing a Hard Drive 200
- Installing a Hard Drive 202
- RAID Controller Module 205
- Control Panel 215
- Installing the Control Panel 216
- Backplane 217
- Installing the Backplane 220
- Management: System Interfaces 223
- Array Software 225
- Storage Array Support Data 229
- Event Log 231
- Recovery Guru 232
- Storage Array Profile 232
- Finding Nodes 235
- Using Go To 236
- Condition 237
- Locating a Physical Disk 240
- SMrepassist Utility 243
- Unidentified Devices 244
- Software 246
- Troubleshooting: Your Array 249
- Management Modules 251
- Troubleshooting Hard Drives 254
- Connections 255
- Conditions 257
- Invalid Storage Array 257
- ECC Errors 257
- PCI Errors 258
- Critical Conditions 258
- Noncritical Conditions 258
- Getting Help 259
- 260 Getting Help 260
- Index 261 261
- Index 262 262
- Index 263 263
- Index 264 264
- Index 265 265
- Index 266 266
- Index 267 267
- 268 Index 268
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