RAID Levels, Virtual Disk States | Dell MD3200, MD3220 manual

3Provide host server access.

4Create mappings to associate the virtual disks with the host servers.

NOTE: Host server access must be created before mapping virtual disks.

Disk groups are always created in the unconfigured capacity of a storage array. Unconfigured capacity is the available physical disk space not already assigned in the storage array.

Virtual disks are created within the free capacity of a disk group. Free capacity is the space in a disk group that has not been assigned to a virtual disk.

Virtual Disk States

The storage array recognizes the following virtual disk states.

Table 4-2. RAID Controller Virtual Disk States

State	Description

Optimal	The virtual disk contains physical disks that are all online.
Degraded	The virtual disk with a redundant RAID level contains an inaccessible
	physical disk. The system can still work properly, but performance may
	be affected and additional disk failures may result in data loss.
Offline	A virtual disk with one or more member disks is in an inaccessible
	(failed, missing, or offline) state. Data on the virtual disk is no longer
	accessible.
Force online	The storage array forces a virtual disk that is in an Offline state to an
	Optimal state. If all the member physical disks are not available, the
	storage array forces the virtual disk to a Degraded state. The storage
	array can force a virtual disk to an Online state only when a sufficient
	number of physical disks are available to support the virtual disk.

RAID Levels

RAID levels determine the way in which data is written to physical disks. Different RAID levels provide different levels of accessibility, redundancy, and capacity.

40

Planning: MD3200 Series Storage Array Terms and Concepts

Image 40

Dell MD3200, MD3220 owner manual RAID Levels, RAID Controller Virtual Disk States Description

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 Managing 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 126 129130 131 Creating a Snapshot Virtual Disk Using 142 Creating a Snapshot Virtual Disk Using146 151 160 161Types of Virtual Disk Copies 164 165 Using DM Multipathing Devices 180 174176 179 Self-Monitoring Analysis and Reporting 201202 203 RAID Controller Module Backup Battery Unit 214 Power Supply/Cooling Fan Module 216218 221 Recovering From an Unresponsive Storage 241 232233 Collecting the Physical Disk Data 234 Safety First-For you and Your Array 253 Troubleshooting Power Supply/Cooling 254Troubleshooting Expansion Enclosure Troubleshooting a Damaged Array 261 Getting Help Contacting Dell Index Contents Introduction About This Document Other Information you May Need Dell PowerVault Modular Disk Storage ManagerMD3200 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 Battery Backup Unit RAID Controller Module-Additional FeaturesComponent Function System Password Reset Storage Array Thermal ShutdownShutdown Threshold Type Event Description Cache Functions and Features Cache MirroringWrite-Back Cache 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 Virtual Disk States RAID LevelsRAID Controller Virtual Disk States Description RAID Level Usage RAID RAID Segment Size Virtual Disk OperationsVirtual Disk Initialization Background Initialization Media Verification Consistency CheckCycle Time Disk Group Operations Virtual Disk Operations LimitRAID Level Migration Segment Size Migration Virtual Disk Capacity Expansion Disk Group Expansion Disk Group Defragmentation RAID Background Operations PriorityDisk Group Operations Limit Virtual Disk Migration and Disk Roaming Disk Migration Planning MD3200 Series Storage Array Terms and Concepts Advanced Features Disk Roaming Host 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 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 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 Locating Storage Arrays AMW, select Storage Array→ Blink→ Storage Array Naming or Renaming Storage Arrays AMW Setup tab, select Rename Storage ArrayName/Rename Storage Arrays dialog is displayed Password Setting a PasswordType the New password Password Guidelines Viewing Storage Array Connections Adding/Editing a Comment to an Existing Storage Array Removing Storage ArraysSelect Edit→ Comment Select Edit→ Remove→ Storage Array Enabling Premium Features Failover Alert Display Changing Expansion Enclosure ID Number Changing the Cache Settings on the Storage ArrayChanging the Enclosure Order in the Physical Pane Configuring Alert Notifications Select Configure AlertsAMW, select Storage Array→ Change→ Enclosure Order 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 Windows Enabling or Disabling the Event MonitorLinux Configuration About Your Host Configuring Host Access Defining a Host Using the Mappings TabSelect Mappings→ Define→ Host Configuration About Your Host Removing Host Access Managing Host GroupsCreating a Host Group Select Mappings→ Remove Moving a Host to a Different Host Group Adding a Host to a Host GroupRemoving a Host From a Host Group Select Mappings→ Move Removing a Host Group Host Topology Linux Starting or Stopping the Host Context AgentWindows 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 Changing the Virtual Disk Modification Priority Map later Using Mappings View100 Changing the Virtual Disk Cache Settings 101 102 Changing the Segment Size of a Virtual Disk 103 Select Virtual Disk→ Change→ Segment Size Changing the I/O Type104 File system typical Database Multimedia Custom Choosing an Appropriate Physical Disk Type105 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 Confirm Change Security Key window is displayed Changing a Security Key110 Click Change Key Saving a Security Key111 Validate Security Key 112 Erasing Secure Physical Disks Unlocking Secure Physical Disks113 Select Physical disk→ Hot Spare Coverage Configuring Hot Spare Physical Disks114 Hot Spares and Rebuild Hot Spare Physical Disk Options window is displayedClick Unassign 115 Global Hot Spares Hot Spare OperationHot Spare Drive Protection 116 Enclosure Loss Protection 117 118 Criteria for Enclosure Loss Protection RAID Level Creating Host-to-Virtual Disk Mappings Host-to-Virtual Disk Mapping119 120 Modifying and Removing Host-to-Virtual Disk Mapping 121 Changing Controller Ownership of the Virtual Disk Removing Host-to-Virtual Disk MappingSelect Virtual Disk→ Change→ Ownership/Preferred Path 122 Select Disk Group→ Change→ Ownership/Preferred Path 123 Removing a Host-to-Virtual Disk Mapping Using Linux Dmmp Changing the RAID Level of a Disk GroupSelect Disk Group→ Change→ RAID Level 124 125 126 Restricted MappingsOperating System Highest LUN 127 128 Changing the RAID Level of a Disk Group 129 Storage Partitioning 130 Select Disk Group→ Add Free Capacity Physical Disks Disk Group and Virtual Disk Expansion131 Virtual Disk Expansion Using Free Capacity132 Using Unconfigured Capacity Disk Group MigrationExport Disk Group Non-Exportable Components Import Disk Group Exporting a Disk GroupImporting a Disk Group 134 Non-Importable Components 135 Storage Array Media Scan Changing Media Scan Settings136 Suspending the Media Scan 137 138 Configuration Premium Feature- Snapshot Virtual Disks 139 Common Reasons for Scheduling a Snapshot Virtual Disk Scheduling a Snapshot Virtual Disk140 Guidelines for Creating Snapshot Schedules 141 Creating a Snapshot Virtual Disk Using the Simple Path Enabling and Disabling Snapshot SchedulesScheduled Snapshot Icons 142 About the Simple Path 143 144 145 About the Advanced Path Creating a Snapshot Virtual Disk Using 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 Add Physical Disks window closes Click Add Physical Disks154 Disabling a Snapshot Virtual Disk 155 Preparing Host Servers to Re-create a Snapshot Virtual Disk 156 Re-creating Snapshot Virtual Disks Snapshot RollbackSelect Virtual Disk→ Snapshot→ Re-create 157 Rules and Guidelines for Performing a Snapshot Rollback 158 Command Line Options Protecting Against a Failed Snapshot RollbackPrevious Versions of the MD Storage Manager Starting a Snapshot Rollback Resuming a Snapshot Rollback RollbackConfirm Rollback Snapshot Virtual Disk dialog is displayed 160 Canceling a Snapshot Rollback 161 162 Configuration Premium Feature- Virtual Disk Copy 163 Offline Copy Types of Virtual Disk Copies164 Online Copy 165 Virtual Disk Read/Write Permissions Creating a Virtual Disk Copy for an Mscs Shared Disk166 Virtual Disk Copy Restrictions 167 Before you Begin Creating a Virtual Disk Copy168 Virtual Disk Copy and Modification Operations Create Copy WizardFailed Virtual Disk Copy 169 Preferred RAID Controller Module Ownership Failed RAID Controller ModuleCopy Manager 170 Copying the Virtual Disk 171 Storage Array Performance During Virtual Disk Copy 172 Setting Copy Priority Stopping a Virtual Disk CopySelect Change→ Copy Priority 173 Preparing Host Servers to Recopy a Virtual Disk Recopying a Virtual Disk174 Re-Copying a Virtual Disk 175 Removing Copy Pairs Select Copy→ Re-CopySelect Copy→ Remove Copy Pairs 176 177 178 Configuration Device Mapper Multipath for Linux 179 Prerequisite 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 Create a File System on a Device Mapper Partition Mount a Device Mapper PartitionReady for Use Blacklist Local Drive in Multi-path Driver Important Information About Special Partitions 185 Device Mapper Commands Descriptions 186 Limitations and Known Issues 187 188 TroubleshootingQuestion Answer Downloading RAID Controller and Nvsram Packages 189 Downloading Both RAID Controller and Nvsram Firmware 190 Click Transfer 191 Downloading Only Nvsram Firmware 192 Upgrade RAID Controller Module Firmware window is displayed Select Tools→ Upgrade RAID Controller Module Firmware193 194 Downloading Physical Disk Firmware 195 196 AMW, select Advanced→ Maintenance→ Download→ EMM Firmware Downloading MD1200 Series Expansion Module EMM FirmwareDownload Environmental EMM Firmware dialog is displayed 197 Self-Monitoring Analysis and Reporting Technology Smart Media Errors and Unreadable Sectors198 199 200 Recommended Tools Management Installing Array Components201 Installing the Front Bezel Front Bezel OptionalRemoving the Front Bezel 202 Safety Models AMT, E03J, and E04J Hard DrivesRemoving a Hard-Drive Blank 203 Removing a Hard Drive Installing a Hard-Drive Blank204 Removing and Installing a Hard Drive 205 Installing a Hard Drive 206 Removing a Hard Drive From a Hard-Drive Carrier 207 208 Installing a Hard Drive Into a Hard-Drive Carrier RAID Controller ModuleRemoving a RAID Controller Module Blank 209 Installing a RAID Controller Module Blank 210 Removing a RAID Controller Module 211 Opening the RAID Controller Module Installing a RAID Controller Module212 Closing the RAID Controller Module 213 Removing the RAID Controller Module Backup Battery Unit RAID Controller Module Backup Battery Unit214 Installing the RAID Controller Module Backup Battery Unit 215 Removing a Power Supply/Cooling Fan Module Power Supply/Cooling Fan Module216 Installing a Power Supply/Cooling Fan Module 217 Removing the Control Panel Control Panel218 219 Installing the Control Panel 220 Removing the Backplane Backplane221 222 16. Removing and Installing the Backplane-PowerVault MD3200 17. Removing and Installing the Backplane-PowerVault MD3220 Installing the Backplane 224 Viewing the Firmware Inventory Management Firmware Inventory225 226 Microsoft Services Virtual Disk ServiceVolume Shadow-Copy Service Management System Interfaces 228 Troubleshooting Your Storage Array Software Start-Up RoutineDevice Health Conditions 229 230 On the Setup tab, select Manage a Storage ArrayStatus Icon Description 231 Additional Status Icons Description Storage Array Support Data 232 Enter the Execution summary Automatically Collect the Support Bundle Data233 Event Log Collecting the Physical Disk Data234 Recovery Guru 235 Select Storage Array→ View→ Profile Storage Array Profile236 237 Viewing the Physical Associations Viewing the Logical Associations238 Finding Nodes 239 Using Go To Select Find all free capacity nodesClick Find Next 240 Recovering From an Unresponsive Storage Array Condition 241 242 243 Locating a Physical Disk 244 Select Physical Disk→ Blink→ Expansion Enclosure Locating an Expansion Enclosure245 Capturing the State Information 246 SMrepassist Utility 247 Unidentified Devices Recovering From an Unidentified Storage Array248 249 250 Starting or Restarting the Host Context Agent Software 251 252 Troubleshooting Your Array Troubleshooting Loss of CommunicationTroubleshooting External Connections 253 Troubleshooting Power Supply/Cooling Fan Module 254 Troubleshooting Expansion Enclosure Management Modules Troubleshooting Array Cooling Problems255 Troubleshooting RAID Controller Modules 256 257 Troubleshooting Hard Drives 258 Troubleshooting Array and Expansion Enclosure Connections 259 Troubleshooting a Wet Storage Array 260 Conditions Troubleshooting a Damaged Array261 ECC Errors PCI ErrorsInvalid Storage Array Critical Conditions Noncritical Conditions 263 264 Getting Help Contacting DellVisit support.dell.com Click All Support from Support menu 266 Index 267 268 269 270 271 272