186, Device Mapper Commands Descriptions | Dell MD3200, MD3220

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	Flushes out Device Mapper for the specified
<multipath_dev_node>	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.

186

Configuration: Device Mapper Multipath for Linux

Image 186

Dell MD3200, MD3220 owner manual 186, Device Mapper Commands Descriptions

Contents

Dell PowerVault MD3200 and MD3220 Storage Arrays Page Contents RAID Controller Module Connectors Cache Functions and Features Virtual Disk Operations Limit Configuring Alert Notifications Out-of-Band and In-Band Management Enabling or Disabling the Event Monitor Managing Host Port IdentifiersCreating Disk Groups and Virtual Disks Configuring Hot Spare Physical Disks Physical Disk Security with SelfHost-to-Virtual Disk Mapping 130 126129 131 146 Creating a Snapshot Virtual Disk Using 142Creating a Snapshot Virtual Disk Using 151 Types of Virtual Disk Copies 164 160161 165 176 Using DM Multipathing Devices 180174 179 202 Self-Monitoring Analysis and Reporting201 203 218 RAID Controller Module Backup Battery Unit 214Power Supply/Cooling Fan Module 216 221 233 Recovering From an Unresponsive Storage 241232 Collecting the Physical Disk Data 234 Troubleshooting Expansion Enclosure Safety First-For you and Your Array 253Troubleshooting Power Supply/Cooling 254 Troubleshooting a Damaged Array 261 Getting Help Contacting Dell Index Contents Introduction About This Document Dell PowerVault Modular Disk Storage Manager Other Information you May NeedMD3200 Series Storage Array Introduction Introduction Planning About Your Storage Array Overview Hardware Features Front-Panel Features and Indicators Planning About Your Storage Array Item Indicator, Button, or Icon Description Connector Back Panel Features and Indicators Hard-Drive Indicator Patterns Hard Drive Indicators Power Supply and Cooling Fan Features Drive-Status Indicator Pattern Condition Power Indicator Codes and Features Planning RAID Controller Modules RAID Controller Modules RAID Controller Module Connectors and Features Function Item Component Function RAID Controller Module-Additional Features Battery Backup UnitComponent Function Shutdown Threshold Type System Password ResetStorage Array Thermal Shutdown Event Description Write-Back Cache Cache Functions and FeaturesCache Mirroring Write-Through Cache Planning MD3200 Series Storage Array Terms and Concepts Physical Disks, Virtual Disks, and Disk Groups Physical Disks Physical Disk States Self-Monitoring Analysis and Reporting Technology Virtual Disks and Disk Groups RAID Levels Virtual Disk StatesRAID Controller Virtual Disk States Description RAID Level Usage RAID RAID Virtual Disk Initialization Segment SizeVirtual Disk Operations Background Initialization Consistency Check Media VerificationCycle Time RAID Level Migration Disk Group OperationsVirtual Disk Operations Limit Segment Size Migration Virtual Disk Capacity Expansion Disk Group Expansion RAID Background Operations Priority Disk Group DefragmentationDisk Group Operations Limit Virtual Disk Migration and Disk Roaming Disk Migration Planning MD3200 Series Storage Array Terms and Concepts Advanced Features Disk Roaming Host Server-to-Virtual Disk Mapping Host TypesSnapshot Virtual Disks Snapshot Repository Virtual Disk Virtual Disk Copy Source Virtual DiskTarget Virtual Disk Virtual Disk Recovery Using Snapshot and Disk Copy TogetherMulti-Path Software Preferred and Alternate Controllers and Paths Virtual Disk Ownership Load Balancing Monitoring MD3200 Series System Performance AMW, select Storage Array→ Monitor Performance Click Settings Performance Monitor Table Description Column Headings Planning MD3200 Series Storage Array Terms and Concepts Configuration Overview User Interface Enterprise Management Window Inheriting the System Settings Array Management Window Configuration Overview Configuration About Your Storage Array Out-of-Band and In-Band ManagementOut-of-Band Management Storage Arrays Adding Storage ArraysIn-Band Management Automatic Discovery of Storage Arrays Manual Addition of a Storage ArraySelect Edit→ Add Storage Array Setting Up Your Storage Array Locating Storage Arrays AMW, select Storage Array→ Blink→ Storage Array AMW Setup tab, select Rename Storage Array Naming or Renaming Storage ArraysName/Rename Storage Arrays dialog is displayed Setting a Password PasswordType the New password Password Guidelines Viewing Storage Array Connections Select Edit→ Comment Adding/Editing a Comment to an Existing Storage ArrayRemoving Storage Arrays Select Edit→ Remove→ Storage Array Enabling Premium Features Failover Alert Display Changing the Cache Settings on the Storage Array Changing Expansion Enclosure ID NumberChanging the Enclosure Order in the Physical Pane AMW, select Storage Array→ Change→ Enclosure Order Configuring Alert NotificationsSelect Configure Alerts Select All storage arrays Configuring E-mail Alerts Configuration About Your Storage Array Configuring Snmp Alerts Configuration About Your Storage Array Battery Settings Setting the Storage Array RAID Controller Module Clocks Configuration Event Monitor Enabling or Disabling the Event Monitor WindowsLinux Configuration About Your Host Configuring Host Access Using the Mappings Tab Defining a HostSelect Mappings→ Define→ Host Configuration About Your Host Creating a Host Group Removing Host AccessManaging Host Groups Select Mappings→ Remove Removing a Host From a Host Group Moving a Host to a Different Host GroupAdding a Host to a Host Group Select Mappings→ Move Removing a Host Group Host Topology Starting or Stopping the Host Context Agent LinuxWindows Data Path Protection Click Action→ Start Managing Host Port Identifiers Add Host Port Identifier dialog is displayed Configuration About Your Host Configuration Disk Groups and Virtual Disks Creating Disk Groups and Virtual Disks Creating Disk Groups Introduction Create Disk Group window is displayed Configuration Disk Groups and Virtual Disks Locating a Disk Group Creating Virtual Disks Configuration Disk Groups and Virtual Disks Map later Using Mappings View Changing the Virtual Disk Modification Priority100 Changing the Virtual Disk Cache Settings 101 102 Changing the Segment Size of a Virtual Disk 103 Changing the I/O Type Select Virtual Disk→ Change→ Segment Size104 Choosing an Appropriate Physical Disk Type File system typical Database Multimedia Custom105 Physical Disk Security with Self Encrypting Disk 106 Shows how to interpret the security status of a disk group 107 Creating a Security Key 108 Click Create Key 109 Changing a Security Key Confirm Change Security Key window is displayed110 Saving a Security Key Click Change Key111 Validate Security Key 112 Unlocking Secure Physical Disks Erasing Secure Physical Disks113 Configuring Hot Spare Physical Disks Select Physical disk→ Hot Spare Coverage114 Click Unassign Hot Spares and RebuildHot Spare Physical Disk Options window is displayed 115 Hot Spare Drive Protection Global Hot SparesHot Spare Operation 116 Enclosure Loss Protection 117 118 Criteria for Enclosure Loss Protection RAID Level Host-to-Virtual Disk Mapping Creating Host-to-Virtual Disk Mappings119 120 Modifying and Removing Host-to-Virtual Disk Mapping 121 Select Virtual Disk→ Change→ Ownership/Preferred Path Changing Controller Ownership of the Virtual DiskRemoving Host-to-Virtual Disk Mapping 122 Select Disk Group→ Change→ Ownership/Preferred Path 123 Select Disk Group→ Change→ RAID Level Removing a Host-to-Virtual Disk Mapping Using Linux DmmpChanging the RAID Level of a Disk Group 124 125 Restricted Mappings 126Operating System Highest LUN 127 128 Changing the RAID Level of a Disk Group 129 Storage Partitioning 130 Disk Group and Virtual Disk Expansion Select Disk Group→ Add Free Capacity Physical Disks131 Using Free Capacity Virtual Disk Expansion132 Export Disk Group Using Unconfigured CapacityDisk Group Migration Non-Exportable Components Importing a Disk Group Import Disk GroupExporting a Disk Group 134 Non-Importable Components 135 Changing Media Scan Settings Storage Array Media Scan136 Suspending the Media Scan 137 138 Configuration Premium Feature- Snapshot Virtual Disks 139 Scheduling a Snapshot Virtual Disk Common Reasons for Scheduling a Snapshot Virtual Disk140 Guidelines for Creating Snapshot Schedules 141 Scheduled Snapshot Icons Creating a Snapshot Virtual Disk Using the Simple PathEnabling and Disabling Snapshot Schedules 142 About the Simple Path 143 144 145 Creating a Snapshot Virtual Disk Using the Advanced Path About the Advanced Path146 147 148 Creating the Snapshot Using the Advanced Path 149 Specify Virtual Disk Parameters window is displayed 150 Specifying Snapshot Virtual Disk Names 151 Snapshot Repository Capacity 152 153 Click Add Physical Disks Add Physical Disks window closes154 Disabling a Snapshot Virtual Disk 155 Preparing Host Servers to Re-create a Snapshot Virtual Disk 156 Select Virtual Disk→ Snapshot→ Re-create Re-creating Snapshot Virtual DisksSnapshot Rollback 157 Rules and Guidelines for Performing a Snapshot Rollback 158 Previous Versions of the MD Storage Manager Command Line OptionsProtecting Against a Failed Snapshot Rollback Starting a Snapshot Rollback Confirm Rollback Snapshot Virtual Disk dialog is displayed Resuming a Snapshot RollbackRollback 160 Canceling a Snapshot Rollback 161 162 Configuration Premium Feature- Virtual Disk Copy 163 Types of Virtual Disk Copies Offline Copy164 Online Copy 165 Creating a Virtual Disk Copy for an Mscs Shared Disk Virtual Disk Read/Write Permissions166 Virtual Disk Copy Restrictions 167 Creating a Virtual Disk Copy Before you Begin168 Failed Virtual Disk Copy Virtual Disk Copy and Modification OperationsCreate Copy Wizard 169 Copy Manager Preferred RAID Controller Module OwnershipFailed RAID Controller Module 170 Copying the Virtual Disk 171 Storage Array Performance During Virtual Disk Copy 172 Select Change→ Copy Priority Setting Copy PriorityStopping a Virtual Disk Copy 173 Recopying a Virtual Disk Preparing Host Servers to Recopy a Virtual Disk174 Re-Copying a Virtual Disk 175 Select Copy→ Remove Copy Pairs Removing Copy PairsSelect Copy→ Re-Copy 176 177 178 Configuration Device Mapper Multipath for Linux 179 Using DM Multipathing Devices Prerequisite Steps180 Device Mapper Configuration Steps Scan for Newly Added Virtual Disks181 182 Create a New fdisk Partition on a Multipath Device Node Add a New Partition to Device Mapper183 Ready for Use Create a File System on a Device Mapper PartitionMount a Device Mapper Partition Blacklist Local Drive in Multi-path Driver Important Information About Special Partitions 185 Device Mapper Commands Descriptions 186 Limitations and Known Issues 187 Troubleshooting 188Question Answer Downloading RAID Controller and Nvsram Packages 189 Downloading Both RAID Controller and Nvsram Firmware 190 Click Transfer 191 Downloading Only Nvsram Firmware 192 Select Tools→ Upgrade RAID Controller Module Firmware Upgrade RAID Controller Module Firmware window is displayed193 194 Downloading Physical Disk Firmware 195 196 Download Environmental EMM Firmware dialog is displayed AMW, select Advanced→ Maintenance→ Download→ EMM FirmwareDownloading MD1200 Series Expansion Module EMM Firmware 197 Media Errors and Unreadable Sectors Self-Monitoring Analysis and Reporting Technology Smart198 199 200 Management Installing Array Components Recommended Tools201 Removing the Front Bezel Installing the Front BezelFront Bezel Optional 202 Removing a Hard-Drive Blank Safety Models AMT, E03J, and E04JHard Drives 203 Installing a Hard-Drive Blank Removing a Hard Drive204 Removing and Installing a Hard Drive 205 Installing a Hard Drive 206 Removing a Hard Drive From a Hard-Drive Carrier 207 208 Removing a RAID Controller Module Blank Installing a Hard Drive Into a Hard-Drive CarrierRAID Controller Module 209 Installing a RAID Controller Module Blank 210 Removing a RAID Controller Module 211 Installing a RAID Controller Module Opening the RAID Controller Module212 Closing the RAID Controller Module 213 RAID Controller Module Backup Battery Unit Removing the RAID Controller Module Backup Battery Unit214 Installing the RAID Controller Module Backup Battery Unit 215 Power Supply/Cooling Fan Module Removing a Power Supply/Cooling Fan Module216 Installing a Power Supply/Cooling Fan Module 217 Control Panel Removing the Control Panel218 219 Installing the Control Panel 220 Backplane Removing the Backplane221 222 16. Removing and Installing the Backplane-PowerVault MD3200 17. Removing and Installing the Backplane-PowerVault MD3220 Installing the Backplane 224 Management Firmware Inventory Viewing the Firmware Inventory225 226 Volume Shadow-Copy Service Microsoft ServicesVirtual Disk Service Management System Interfaces 228 Device Health Conditions Troubleshooting Your Storage Array SoftwareStart-Up Routine 229 On the Setup tab, select Manage a Storage Array 230Status Icon Description 231 Additional Status Icons Description Storage Array Support Data 232 Automatically Collect the Support Bundle Data Enter the Execution summary233 Collecting the Physical Disk Data Event Log234 Recovery Guru 235 Storage Array Profile Select Storage Array→ View→ Profile236 237 Viewing the Logical Associations Viewing the Physical Associations238 Finding Nodes 239 Click Find Next Using Go ToSelect Find all free capacity nodes 240 Recovering From an Unresponsive Storage Array Condition 241 242 243 Locating a Physical Disk 244 Locating an Expansion Enclosure Select Physical Disk→ Blink→ Expansion Enclosure245 Capturing the State Information 246 SMrepassist Utility 247 Recovering From an Unidentified Storage Array Unidentified Devices248 249 250 Starting or Restarting the Host Context Agent Software 251 252 Troubleshooting External Connections Troubleshooting Your ArrayTroubleshooting Loss of Communication 253 Troubleshooting Power Supply/Cooling Fan Module 254 Troubleshooting Array Cooling Problems Troubleshooting Expansion Enclosure Management Modules255 Troubleshooting RAID Controller Modules 256 257 Troubleshooting Hard Drives 258 Troubleshooting Array and Expansion Enclosure Connections 259 Troubleshooting a Wet Storage Array 260 Troubleshooting a Damaged Array Conditions261 Invalid Storage Array ECC ErrorsPCI Errors Critical Conditions Noncritical Conditions 263 264 Visit support.dell.com Getting HelpContacting Dell Click All Support from Support menu 266 Index 267 268 269 270 271 272