Online Copy, 165 | Dell MD3220, MD3200 manual

formatted with a journaling file system, any attempt to issue a read request to the source virtual disk may be rejected by the storage array RAID controller modules and result in an error message. Make sure that the Read-Only attribute for the target virtual disk is disabled after the virtual disk copy is complete to prevent error messages from being displayed.

Online Copy

An online copy creates a point-in-time snapshot copy of any virtual disk within a storage array, while still allowing writes to the virtual disk when the copy is in progress. This is achieved by creating a snapshot of the virtual disk and using that snapshot as the actual source virtual disk for the copy. In an online virtual disk copy, the relationship is between a snapshot virtual disk and a target virtual disk. The virtual disk for which the point-in-time image is created (the source virtual disk) must be a standard virtual disk in the storage array.

A snapshot virtual disk and a snapshot repository virtual disk are created during the online copy operation. The snapshot virtual disk is not an actual virtual disk containing data; instead, it is a reference to the data contained on the virtual disk at a specific time. For each snapshot taken, a snapshot repository virtual disk is created to hold the copy-on-write data for the snapshot. The snapshot repository virtual disk is used only to manage the snapshot image.

Before a data block on the source virtual disk is modified, the contents of the block to be modified are copied to the snapshot repository virtual disk. Because the snapshot repository virtual disk stores copies of the original data in those data blocks, further changes to those data blocks write only to the source virtual disk.

NOTE: If the snapshot virtual disk that is used as the copy source is active, the source virtual disk performance degrades due to copy-on-write operations. When the copy is complete, the snapshot is disabled and the source virtual disk performance is restored. Although the snapshot is disabled, the repository infrastructure and copy relationship remain intact.

Configuration: Premium Feature—Virtual Disk Copy

165

Image 165

Dell MD3220, MD3200 owner manual Online Copy, 165

Contents

Dell PowerVault MD3200 and MD3220 Storage Arrays Page Contents Cache Functions and Features RAID Controller Module Connectors Virtual Disk Operations Limit Out-of-Band and In-Band Management Configuring Alert Notifications 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 129 126130 131 Creating a Snapshot Virtual Disk Using Creating a Snapshot Virtual Disk Using 142146 151 161 160Types of Virtual Disk Copies 164 165 174 Using DM Multipathing Devices 180176 179 201 Self-Monitoring Analysis and Reporting202 203 Power Supply/Cooling Fan Module 216 RAID Controller Module Backup Battery Unit 214218 221 232 Recovering From an Unresponsive Storage 241233 Collecting the Physical Disk Data 234 Troubleshooting Power Supply/Cooling 254 Safety First-For you and Your Array 253Troubleshooting Expansion Enclosure Troubleshooting a Damaged Array 261 Getting Help Contacting Dell Index Contents About This Document Introduction Dell PowerVault Modular Disk Storage Manager Other Information you May NeedMD3200 Series Storage Array Introduction Introduction Overview Planning About Your Storage Array Front-Panel Features and Indicators Hardware Features Planning About Your Storage Array Item Indicator, Button, or Icon Description Connector Back Panel Features and Indicators Hard Drive Indicators Hard-Drive Indicator Patterns Drive-Status Indicator Pattern Condition Power Supply and Cooling Fan Features Power Indicator Codes and Features RAID Controller Modules Planning RAID Controller Modules Function RAID Controller Module Connectors and Features Item Component Function RAID Controller Module-Additional Features Battery Backup UnitComponent Function Storage Array Thermal Shutdown System Password ResetShutdown Threshold Type Event Description Cache Mirroring Cache Functions and FeaturesWrite-Back Cache Write-Through Cache Physical Disks, Virtual Disks, and Disk Groups Planning MD3200 Series Storage Array Terms and Concepts Physical Disk States Physical Disks Virtual Disks and Disk Groups Self-Monitoring Analysis and Reporting Technology RAID Levels Virtual Disk StatesRAID Controller Virtual Disk States Description RAID RAID Level Usage RAID Virtual Disk Operations Segment SizeVirtual Disk Initialization Background Initialization Consistency Check Media VerificationCycle Time Virtual Disk Operations Limit Disk Group OperationsRAID Level Migration Segment Size Migration Disk Group Expansion Virtual Disk Capacity Expansion RAID Background Operations Priority Disk Group DefragmentationDisk Group Operations Limit Disk Migration Virtual Disk Migration and Disk Roaming Planning MD3200 Series Storage Array Terms and Concepts Disk Roaming Advanced Features 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 Virtual Disk Ownership Preferred and Alternate Controllers and Paths Load Balancing AMW, select Storage Array→ Monitor Performance Monitoring MD3200 Series System Performance Click Settings Performance Monitor Table Description Column Headings Planning MD3200 Series Storage Array Terms and Concepts User Interface Configuration Overview Enterprise Management Window Array Management Window Inheriting the System Settings 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 AMW, select Storage Array→ Blink→ Storage Array Locating Storage Arrays 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 Viewing Storage Array Connections Password Guidelines Removing Storage Arrays Adding/Editing a Comment to an Existing Storage ArraySelect Edit→ Comment Select Edit→ Remove→ Storage Array Failover Alert Display Enabling Premium Features Changing the Cache Settings on the Storage Array Changing Expansion Enclosure ID NumberChanging the Enclosure Order in the Physical Pane Select Configure Alerts Configuring Alert NotificationsAMW, 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 Enabling or Disabling the Event Monitor WindowsLinux Configuring Host Access Configuration About Your Host Using the Mappings Tab Defining a HostSelect Mappings→ Define→ Host Configuration About Your Host Managing Host Groups Removing Host AccessCreating a Host Group Select Mappings→ Remove Adding a Host to a Host Group Moving a Host to a Different Host GroupRemoving a Host From a Host Group Select Mappings→ Move Host Topology Removing a Host Group Starting or Stopping the Host Context Agent LinuxWindows Click Action→ Start Data Path Protection Add Host Port Identifier dialog is displayed Managing Host Port Identifiers Configuration About Your Host Creating Disk Groups and Virtual Disks Configuration Disk Groups and Virtual Disks Introduction Create Disk Group window is displayed Creating Disk Groups Configuration Disk Groups and Virtual Disks Creating Virtual Disks Locating a Disk Group Configuration Disk Groups and Virtual Disks Map later Using Mappings View Changing the Virtual Disk Modification Priority100 101 Changing the Virtual Disk Cache Settings 102 103 Changing the Segment Size of a Virtual Disk Changing the I/O Type Select Virtual Disk→ Change→ Segment Size104 Choosing an Appropriate Physical Disk Type File system typical Database Multimedia Custom105 106 Physical Disk Security with Self Encrypting Disk 107 Shows how to interpret the security status of a disk group 108 Creating a Security Key 109 Click Create Key Changing a Security Key Confirm Change Security Key window is displayed110 Saving a Security Key Click Change Key111 112 Validate Security Key Unlocking Secure Physical Disks Erasing Secure Physical Disks113 Configuring Hot Spare Physical Disks Select Physical disk→ Hot Spare Coverage114 Hot Spare Physical Disk Options window is displayed Hot Spares and RebuildClick Unassign 115 Hot Spare Operation Global Hot SparesHot Spare Drive Protection 116 117 Enclosure Loss Protection Criteria for Enclosure Loss Protection RAID Level 118 Host-to-Virtual Disk Mapping Creating Host-to-Virtual Disk Mappings119 120 121 Modifying and Removing Host-to-Virtual Disk Mapping Removing Host-to-Virtual Disk Mapping Changing Controller Ownership of the Virtual DiskSelect Virtual Disk→ Change→ Ownership/Preferred Path 122 123 Select Disk Group→ Change→ Ownership/Preferred Path Changing the RAID Level of a Disk Group Removing a Host-to-Virtual Disk Mapping Using Linux DmmpSelect Disk Group→ Change→ RAID Level 124 125 Restricted Mappings 126Operating System Highest LUN 127 128 129 Changing the RAID Level of a Disk Group 130 Storage Partitioning Disk Group and Virtual Disk Expansion Select Disk Group→ Add Free Capacity Physical Disks131 Using Free Capacity Virtual Disk Expansion132 Disk Group Migration Using Unconfigured CapacityExport Disk Group Non-Exportable Components Exporting a Disk Group Import Disk GroupImporting a Disk Group 134 135 Non-Importable Components Changing Media Scan Settings Storage Array Media Scan136 137 Suspending the Media Scan 138 139 Configuration Premium Feature- Snapshot Virtual Disks Scheduling a Snapshot Virtual Disk Common Reasons for Scheduling a Snapshot Virtual Disk140 141 Guidelines for Creating Snapshot Schedules Enabling and Disabling Snapshot Schedules Creating a Snapshot Virtual Disk Using the Simple PathScheduled Snapshot Icons 142 143 About the Simple Path 144 145 Creating a Snapshot Virtual Disk Using the Advanced Path About the Advanced Path146 147 148 149 Creating the Snapshot Using the Advanced Path 150 Specify Virtual Disk Parameters window is displayed 151 Specifying Snapshot Virtual Disk Names 152 Snapshot Repository Capacity 153 Click Add Physical Disks Add Physical Disks window closes154 155 Disabling a Snapshot Virtual Disk 156 Preparing Host Servers to Re-create a Snapshot Virtual Disk Snapshot Rollback Re-creating Snapshot Virtual DisksSelect Virtual Disk→ Snapshot→ Re-create 157 158 Rules and Guidelines for Performing a Snapshot Rollback Protecting Against a Failed Snapshot Rollback Command Line OptionsPrevious Versions of the MD Storage Manager Starting a Snapshot Rollback Rollback Resuming a Snapshot RollbackConfirm Rollback Snapshot Virtual Disk dialog is displayed 160 161 Canceling a Snapshot Rollback 162 163 Configuration Premium Feature- Virtual Disk Copy Types of Virtual Disk Copies Offline Copy164 165 Online Copy Creating a Virtual Disk Copy for an Mscs Shared Disk Virtual Disk Read/Write Permissions166 167 Virtual Disk Copy Restrictions Creating a Virtual Disk Copy Before you Begin168 Create Copy Wizard Virtual Disk Copy and Modification OperationsFailed Virtual Disk Copy 169 Failed RAID Controller Module Preferred RAID Controller Module OwnershipCopy Manager 170 171 Copying the Virtual Disk 172 Storage Array Performance During Virtual Disk Copy Stopping a Virtual Disk Copy Setting Copy PrioritySelect Change→ Copy Priority 173 Recopying a Virtual Disk Preparing Host Servers to Recopy a Virtual Disk174 175 Re-Copying a Virtual Disk Select Copy→ Re-Copy Removing Copy PairsSelect Copy→ Remove Copy Pairs 176 177 178 179 Configuration Device Mapper Multipath for Linux 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 Mount a Device Mapper Partition Create a File System on a Device Mapper PartitionReady for Use Blacklist Local Drive in Multi-path Driver 185 Important Information About Special Partitions 186 Device Mapper Commands Descriptions 187 Limitations and Known Issues Troubleshooting 188Question Answer 189 Downloading RAID Controller and Nvsram Packages 190 Downloading Both RAID Controller and Nvsram Firmware 191 Click Transfer 192 Downloading Only Nvsram Firmware Select Tools→ Upgrade RAID Controller Module Firmware Upgrade RAID Controller Module Firmware window is displayed193 194 195 Downloading Physical Disk Firmware 196 Downloading MD1200 Series Expansion Module EMM Firmware AMW, select Advanced→ Maintenance→ Download→ EMM FirmwareDownload Environmental EMM Firmware dialog is displayed 197 Media Errors and Unreadable Sectors Self-Monitoring Analysis and Reporting Technology Smart198 199 200 Management Installing Array Components Recommended Tools201 Front Bezel Optional Installing the Front BezelRemoving the Front Bezel 202 Hard Drives Safety Models AMT, E03J, and E04JRemoving a Hard-Drive Blank 203 Installing a Hard-Drive Blank Removing a Hard Drive204 205 Removing and Installing a Hard Drive 206 Installing a Hard Drive 207 Removing a Hard Drive From a Hard-Drive Carrier 208 RAID Controller Module Installing a Hard Drive Into a Hard-Drive CarrierRemoving a RAID Controller Module Blank 209 210 Installing a RAID Controller Module Blank 211 Removing a RAID Controller Module Installing a RAID Controller Module Opening the RAID Controller Module212 213 Closing the RAID Controller Module RAID Controller Module Backup Battery Unit Removing the RAID Controller Module Backup Battery Unit214 215 Installing the RAID Controller Module Backup Battery Unit Power Supply/Cooling Fan Module Removing a Power Supply/Cooling Fan Module216 217 Installing a Power Supply/Cooling Fan Module Control Panel Removing the Control Panel218 219 220 Installing the Control Panel Backplane Removing the Backplane221 222 17. Removing and Installing the Backplane-PowerVault MD3220 16. Removing and Installing the Backplane-PowerVault MD3200 224 Installing the Backplane Management Firmware Inventory Viewing the Firmware Inventory225 226 Virtual Disk Service Microsoft ServicesVolume Shadow-Copy Service Management System Interfaces 228 Start-Up Routine Troubleshooting Your Storage Array SoftwareDevice Health Conditions 229 On the Setup tab, select Manage a Storage Array 230Status Icon Description Additional Status Icons Description 231 232 Storage Array Support Data Automatically Collect the Support Bundle Data Enter the Execution summary233 Collecting the Physical Disk Data Event Log234 235 Recovery Guru Storage Array Profile Select Storage Array→ View→ Profile236 237 Viewing the Logical Associations Viewing the Physical Associations238 239 Finding Nodes Select Find all free capacity nodes Using Go ToClick Find Next 240 241 Recovering From an Unresponsive Storage Array Condition 242 243 244 Locating a Physical Disk Locating an Expansion Enclosure Select Physical Disk→ Blink→ Expansion Enclosure245 246 Capturing the State Information 247 SMrepassist Utility Recovering From an Unidentified Storage Array Unidentified Devices248 249 250 251 Starting or Restarting the Host Context Agent Software 252 Troubleshooting Loss of Communication Troubleshooting Your ArrayTroubleshooting External Connections 253 254 Troubleshooting Power Supply/Cooling Fan Module Troubleshooting Array Cooling Problems Troubleshooting Expansion Enclosure Management Modules255 256 Troubleshooting RAID Controller Modules 257 258 Troubleshooting Hard Drives 259 Troubleshooting Array and Expansion Enclosure Connections 260 Troubleshooting a Wet Storage Array Troubleshooting a Damaged Array Conditions261 PCI Errors ECC ErrorsInvalid Storage Array Critical Conditions 263 Noncritical Conditions 264 Contacting Dell Getting HelpVisit support.dell.com Click All Support from Support menu 266 267 Index 268 269 270 271 272