Dell MD3220, MD3200 Preferred and Alternate Controllers and Paths, Virtual Disk Ownership

Page 55

The multi-path software identifies the existence of multiple paths to a virtual disk and establishes a preferred path to that disk. If any component in the preferred path fails, the multi-path software automatically re-routes I/O requests to the alternate path so that the storage array continues to operate without interruption.

NOTE: Multi-path software available on the MD3200 Series resource media.

Preferred and Alternate Controllers and Paths

A preferred controller is a RAID controller module designated as the owner of a virtual disk or disk group. The preferred controller is automatically selected by MDSM when a virtual disk is created. You can change the preferred RAID controller module owner of a virtual disk after it is created. If a host is only connected to only one RAID controller module, the preferred owner must manually be assigned to the RAID controller module the host can access.

Ownership of a virtual disk is moved from the preferred controller to the secondary controller (also called the alternate controller) when the preferred controller is:

•Physically removed

•Updating firmware

•Involved in an event that caused failover to the alternate controller

Paths used by the preferred RAID controller module to access either the disks or the host server are called the preferred paths; redundant paths are called the alternate paths. If a failure causes the preferred path to become inaccessible, the storage array automatically uses the alternate path to access data, when this occurs the enclosure status LED blinks amber.

Virtual Disk Ownership

MDSM can be used to automatically build and view virtual disks. It uses optimal settings to stripe the disk group. Virtual disks are assigned to alternating RAID controller modules when they are created. This default assignation provides a simple means for load balancing the workload of the RAID controller modules.

Planning: MD3200 Series Storage Array Terms and Concepts

55

Page 54 Page 56
Image 55
Page 54 Page 56
Contents Dell PowerVault MD3200 and MD3220 Storage Arrays Page Contents Cache Functions and Features RAID Controller Module ConnectorsVirtual Disk Operations Limit Out-of-Band and In-Band Management Configuring Alert NotificationsManaging Host Port Identifiers Enabling or Disabling the Event MonitorCreating Disk Groups and Virtual Disks Physical Disk Security with Self Configuring Hot Spare Physical DisksHost-to-Virtual Disk Mapping 131 126129 130151 Creating a Snapshot Virtual Disk Using 142Creating a Snapshot Virtual Disk Using 146165 160161 Types of Virtual Disk Copies 164179 Using DM Multipathing Devices 180174 176203 Self-Monitoring Analysis and Reporting201 202221 RAID Controller Module Backup Battery Unit 214Power Supply/Cooling Fan Module 216 218Collecting the Physical Disk Data 234 Recovering From an Unresponsive Storage 241232 233Troubleshooting a Damaged Array 261 Safety First-For you and Your Array 253Troubleshooting Power Supply/Cooling 254 Troubleshooting Expansion EnclosureGetting Help Contacting Dell Index Contents About This Document IntroductionOther Information you May Need Dell PowerVault Modular Disk Storage ManagerMD3200 Series Storage Array Introduction Introduction Overview Planning About Your Storage ArrayFront-Panel Features and Indicators Hardware FeaturesPlanning About Your Storage Array Item Indicator, Button, or Icon Description Connector Back Panel Features and Indicators Hard Drive Indicators Hard-Drive Indicator PatternsDrive-Status Indicator Pattern Condition Power Supply and Cooling Fan FeaturesPower Indicator Codes and Features RAID Controller Modules Planning RAID Controller ModulesFunction RAID Controller Module Connectors and FeaturesItem Component Function Battery Backup Unit RAID Controller Module-Additional FeaturesComponent Function Event Description System Password ResetStorage Array Thermal Shutdown Shutdown Threshold TypeWrite-Through Cache Cache Functions and FeaturesCache Mirroring Write-Back CachePhysical Disks, Virtual Disks, and Disk Groups Planning MD3200 Series Storage Array Terms and ConceptsPhysical Disk States Physical DisksVirtual Disks and Disk Groups Self-Monitoring Analysis and Reporting TechnologyVirtual Disk States RAID LevelsRAID Controller Virtual Disk States Description RAID RAID Level UsageRAID Background Initialization Segment SizeVirtual Disk Operations Virtual Disk InitializationMedia Verification Consistency CheckCycle Time Segment Size Migration Disk Group OperationsVirtual Disk Operations Limit RAID Level MigrationDisk Group Expansion Virtual Disk Capacity ExpansionDisk Group Defragmentation RAID Background Operations PriorityDisk Group Operations Limit Disk Migration Virtual Disk Migration and Disk RoamingPlanning MD3200 Series Storage Array Terms and Concepts Disk Roaming Advanced FeaturesHost Types Host Server-to-Virtual Disk MappingSnapshot Virtual Disks Snapshot Repository Virtual Disk Source Virtual Disk Virtual Disk CopyTarget Virtual Disk Using Snapshot and Disk Copy Together Virtual Disk RecoveryMulti-Path Software Virtual Disk Ownership Preferred and Alternate Controllers and PathsLoad Balancing AMW, select Storage Array→ Monitor Performance Monitoring MD3200 Series System PerformanceClick Settings Performance Monitor Table Description Column Headings Planning MD3200 Series Storage Array Terms and Concepts User Interface Configuration OverviewEnterprise Management Window Array Management Window Inheriting the System SettingsConfiguration Overview Out-of-Band and In-Band Management Configuration About Your Storage ArrayOut-of-Band Management Adding Storage Arrays Storage ArraysIn-Band Management Manual Addition of a Storage Array Automatic Discovery of Storage ArraysSelect Edit→ Add Storage Array Setting Up Your Storage Array AMW, select Storage Array→ Blink→ Storage Array Locating Storage ArraysNaming or Renaming Storage Arrays AMW Setup tab, select Rename Storage ArrayName/Rename Storage Arrays dialog is displayed Password Setting a PasswordType the New password Viewing Storage Array Connections Password GuidelinesSelect Edit→ Remove→ Storage Array Adding/Editing a Comment to an Existing Storage ArrayRemoving Storage Arrays Select Edit→ CommentFailover Alert Display Enabling Premium FeaturesChanging Expansion Enclosure ID Number Changing the Cache Settings on the Storage ArrayChanging the Enclosure Order in the Physical Pane Select All storage arrays Configuring Alert NotificationsSelect Configure Alerts AMW, select Storage Array→ Change→ Enclosure OrderConfiguring 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 Windows Enabling or Disabling the Event MonitorLinux Configuring Host Access Configuration About Your HostDefining a Host Using the Mappings TabSelect Mappings→ Define→ Host Configuration About Your Host Select Mappings→ Remove Removing Host AccessManaging Host Groups Creating a Host GroupSelect Mappings→ Move Moving a Host to a Different Host GroupAdding a Host to a Host Group Removing a Host From a Host GroupHost Topology Removing a Host GroupLinux Starting or Stopping the Host Context AgentWindows Click Action→ Start Data Path ProtectionAdd Host Port Identifier dialog is displayed Managing Host Port IdentifiersConfiguration About Your Host Creating Disk Groups and Virtual Disks Configuration Disk Groups and Virtual DisksIntroduction Create Disk Group window is displayed Creating Disk GroupsConfiguration Disk Groups and Virtual Disks Creating Virtual Disks Locating a Disk GroupConfiguration Disk Groups and Virtual Disks Changing the Virtual Disk Modification Priority Map later Using Mappings View100 101 Changing the Virtual Disk Cache Settings102 103 Changing the Segment Size of a Virtual DiskSelect Virtual Disk→ Change→ Segment Size Changing the I/O Type104 File system typical Database Multimedia Custom Choosing an Appropriate Physical Disk Type105 106 Physical Disk Security with Self Encrypting Disk107 Shows how to interpret the security status of a disk group108 Creating a Security Key109 Click Create KeyConfirm Change Security Key window is displayed Changing a Security Key110 Click Change Key Saving a Security Key111 112 Validate Security KeyErasing Secure Physical Disks Unlocking Secure Physical Disks113 Select Physical disk→ Hot Spare Coverage Configuring Hot Spare Physical Disks114 115 Hot Spares and RebuildHot Spare Physical Disk Options window is displayed Click Unassign116 Global Hot SparesHot Spare Operation Hot Spare Drive Protection117 Enclosure Loss ProtectionCriteria for Enclosure Loss Protection RAID Level 118Creating Host-to-Virtual Disk Mappings Host-to-Virtual Disk Mapping119 120 121 Modifying and Removing Host-to-Virtual Disk Mapping122 Changing Controller Ownership of the Virtual DiskRemoving Host-to-Virtual Disk Mapping Select Virtual Disk→ Change→ Ownership/Preferred Path123 Select Disk Group→ Change→ Ownership/Preferred Path124 Removing a Host-to-Virtual Disk Mapping Using Linux DmmpChanging the RAID Level of a Disk Group Select Disk Group→ Change→ RAID Level125 126 Restricted MappingsOperating System Highest LUN 127 128 129 Changing the RAID Level of a Disk Group130 Storage PartitioningSelect Disk Group→ Add Free Capacity Physical Disks Disk Group and Virtual Disk Expansion131 Virtual Disk Expansion Using Free Capacity132 Non-Exportable Components Using Unconfigured CapacityDisk Group Migration Export Disk Group134 Import Disk GroupExporting a Disk Group Importing a Disk Group135 Non-Importable ComponentsStorage Array Media Scan Changing Media Scan Settings136 137 Suspending the Media Scan138 139 Configuration Premium Feature- Snapshot Virtual DisksCommon Reasons for Scheduling a Snapshot Virtual Disk Scheduling a Snapshot Virtual Disk140 141 Guidelines for Creating Snapshot Schedules142 Creating a Snapshot Virtual Disk Using the Simple PathEnabling and Disabling Snapshot Schedules Scheduled Snapshot Icons143 About the Simple Path144 145 About the Advanced Path Creating a Snapshot Virtual Disk Using the Advanced Path146 147 148 149 Creating the Snapshot Using the Advanced Path150 Specify Virtual Disk Parameters window is displayed151 Specifying Snapshot Virtual Disk Names152 Snapshot Repository Capacity153 Add Physical Disks window closes Click Add Physical Disks154 155 Disabling a Snapshot Virtual Disk156 Preparing Host Servers to Re-create a Snapshot Virtual Disk157 Re-creating Snapshot Virtual DisksSnapshot Rollback Select Virtual Disk→ Snapshot→ Re-create158 Rules and Guidelines for Performing a Snapshot RollbackStarting a Snapshot Rollback Command Line OptionsProtecting Against a Failed Snapshot Rollback Previous Versions of the MD Storage Manager160 Resuming a Snapshot RollbackRollback Confirm Rollback Snapshot Virtual Disk dialog is displayed161 Canceling a Snapshot Rollback162 163 Configuration Premium Feature- Virtual Disk CopyOffline Copy Types of Virtual Disk Copies164 165 Online CopyVirtual Disk Read/Write Permissions Creating a Virtual Disk Copy for an Mscs Shared Disk166 167 Virtual Disk Copy RestrictionsBefore you Begin Creating a Virtual Disk Copy168 169 Virtual Disk Copy and Modification OperationsCreate Copy Wizard Failed Virtual Disk Copy170 Preferred RAID Controller Module OwnershipFailed RAID Controller Module Copy Manager171 Copying the Virtual Disk172 Storage Array Performance During Virtual Disk Copy173 Setting Copy PriorityStopping a Virtual Disk Copy Select Change→ Copy PriorityPreparing Host Servers to Recopy a Virtual Disk Recopying a Virtual Disk174 175 Re-Copying a Virtual Disk176 Removing Copy PairsSelect Copy→ Re-Copy Select Copy→ Remove Copy Pairs177 178 179 Configuration Device Mapper Multipath for LinuxPrerequisite Steps Using DM Multipathing Devices180 Scan for Newly Added Virtual Disks Device Mapper Configuration Steps181 182 Add a New Partition to Device Mapper Create a New fdisk Partition on a Multipath Device Node183 Blacklist Local Drive in Multi-path Driver Create a File System on a Device Mapper PartitionMount a Device Mapper Partition Ready for Use185 Important Information About Special Partitions186 Device Mapper Commands Descriptions187 Limitations and Known Issues188 TroubleshootingQuestion Answer 189 Downloading RAID Controller and Nvsram Packages190 Downloading Both RAID Controller and Nvsram Firmware191 Click Transfer192 Downloading Only Nvsram FirmwareUpgrade RAID Controller Module Firmware window is displayed Select Tools→ Upgrade RAID Controller Module Firmware193 194 195 Downloading Physical Disk Firmware196 197 AMW, select Advanced→ Maintenance→ Download→ EMM FirmwareDownloading MD1200 Series Expansion Module EMM Firmware Download Environmental EMM Firmware dialog is displayedSelf-Monitoring Analysis and Reporting Technology Smart Media Errors and Unreadable Sectors198 199 200 Recommended Tools Management Installing Array Components201 202 Installing the Front BezelFront Bezel Optional Removing the Front Bezel203 Safety Models AMT, E03J, and E04JHard Drives Removing a Hard-Drive BlankRemoving a Hard Drive Installing a Hard-Drive Blank204 205 Removing and Installing a Hard Drive206 Installing a Hard Drive207 Removing a Hard Drive From a Hard-Drive Carrier208 209 Installing a Hard Drive Into a Hard-Drive CarrierRAID Controller Module Removing a RAID Controller Module Blank210 Installing a RAID Controller Module Blank211 Removing a RAID Controller ModuleOpening the RAID Controller Module Installing a RAID Controller Module212 213 Closing the RAID Controller ModuleRemoving the RAID Controller Module Backup Battery Unit RAID Controller Module Backup Battery Unit214 215 Installing the RAID Controller Module Backup Battery UnitRemoving a Power Supply/Cooling Fan Module Power Supply/Cooling Fan Module216 217 Installing a Power Supply/Cooling Fan ModuleRemoving the Control Panel Control Panel218 219 220 Installing the Control PanelRemoving the Backplane Backplane221 222 17. Removing and Installing the Backplane-PowerVault MD3220 16. Removing and Installing the Backplane-PowerVault MD3200224 Installing the BackplaneViewing the Firmware Inventory Management Firmware Inventory225 226 Management System Interfaces Microsoft ServicesVirtual Disk Service Volume Shadow-Copy Service228 229 Troubleshooting Your Storage Array SoftwareStart-Up Routine Device Health Conditions230 On the Setup tab, select Manage a Storage ArrayStatus Icon Description Additional Status Icons Description 231232 Storage Array Support DataEnter the Execution summary Automatically Collect the Support Bundle Data233 Event Log Collecting the Physical Disk Data234 235 Recovery GuruSelect Storage Array→ View→ Profile Storage Array Profile236 237 Viewing the Physical Associations Viewing the Logical Associations238 239 Finding Nodes240 Using Go ToSelect Find all free capacity nodes Click Find Next241 Recovering From an Unresponsive Storage Array Condition242 243 244 Locating a Physical DiskSelect Physical Disk→ Blink→ Expansion Enclosure Locating an Expansion Enclosure245 246 Capturing the State Information247 SMrepassist UtilityUnidentified Devices Recovering From an Unidentified Storage Array248 249 250 251 Starting or Restarting the Host Context Agent Software252 253 Troubleshooting Your ArrayTroubleshooting Loss of Communication Troubleshooting External Connections254 Troubleshooting Power Supply/Cooling Fan ModuleTroubleshooting Expansion Enclosure Management Modules Troubleshooting Array Cooling Problems255 256 Troubleshooting RAID Controller Modules257 258 Troubleshooting Hard Drives259 Troubleshooting Array and Expansion Enclosure Connections260 Troubleshooting a Wet Storage ArrayConditions Troubleshooting a Damaged Array261 Critical Conditions ECC ErrorsPCI Errors Invalid Storage Array263 Noncritical Conditions264 Click All Support from Support menu Getting HelpContacting Dell Visit support.dell.com266 267 Index268 269 270 271 272
Related manuals
Manual 260 pages 11.3 Kb Manual 74 pages 53.1 Kb Manual 22 pages 36.51 Kb
Top Page Image Contents