Raid | Dell MD3200, MD3220 manual

RAID 1

RAID 1 uses disk mirroring so that data written to one physical disk is simultaneously written to another physical disk. This RAID level offers fast performance and the best data availability, but also the highest disk overhead. RAID 1 is recommended for small databases or other applications that do not require large capacity for example accounting, payroll, or financial applications. RAID 1 provides full data redundancy.

RAID 5

RAID 5 uses parity and striping data across all physical disks (distributed parity) to provide high data throughput and data redundancy, especially for small random access. RAID 5 is a versatile RAID level and is suited for multi- user environments where typical I/O size is small and there is a high proportion of read activity such as file, application, database, web, e-mail, news, and intranet servers.

RAID 6

RAID 6 is similar to RAID 5 but provides an additional parity disk for better redundancy. RAID 6 is the most versatile RAID level and is suited for multi- user environments where typical I/O size is small and there is a high proportion of read activity. RAID 6 is recommended when large size physical disks are used or large number of physical disks are used in a disk group.

RAID 10

RAID 10, a combination of RAID 1 and RAID 0, uses disk striping across mirrored disks. It provides high data throughput and complete data redundancy. Utilizing an even number of physical disks (four or more) creates a RAID level 10 disk group and/or virtual disk. Because RAID levels 1 and 10 use disk mirroring, half of the capacity of the physical disks is utilized for mirroring. This leaves the remaining half of the physical disk capacity for actual storage. RAID 10 is automatically used when a RAID level of 1 is chosen with four or more physical disks. RAID 10 works well for medium- sized databases or any environment that requires high performance and fault tolerance and moderate-to-medium capacity.

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Planning: MD3200 Series Storage Array Terms and Concepts

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Dell MD3200, MD3220 owner manual Raid

Contents

Dell PowerVault MD3200 and MD3220 Storage Arrays May Contents Cache Functions and Features Planning MD3200 Series Storage Array Terms and Concepts Virtual Disk Operations Limit Configuring Alert Notifications Out-of-Band and In-Band Management Enabling or Disabling the Event Monitor Managing Host Port Identifiers Physical Disk Security with Self Encrypting Configuring Hot Spare Physical DisksHost-to-Virtual Disk Mapping Creating a Snapshot Virtual Disk Using Snapshot Using the Simple Path 137122 125 145 Re-creating a Snapshot Virtual Disk 152Creating a Virtual Disk Copy for an Mscs 154 Using DM Multipathing Devices 168 159160 161 Media Errors and Unreadable Sectors 187 Downloading RAID Controller and Nvsram177 178 Power Supply/Cooling Fan Module 204 197202 206 Recovering From an Unresponsive Storage 229 217Storage Array Support Data 220 221 Safety First-For you and Your Array Troubleshooting Storage Array Startup FailureTroubleshooting Loss of Communication Troubleshooting External Connections 253 Introduction About This Document Dell PowerVault MD3200 Series Storage Array Dell PowerVault Modular Disk Storage Manager Other Information you May Need 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 Power Indicator Codes Item LED Type Icon Description 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 Virtual Disk Recovery Virtual Disk CopySource Virtual Disk Target Virtual Disk Using Snapshot and Disk Copy Together Multi-Path Software Preferred and Alternate Controllers and Paths Virtual Disk Ownership Load Balancing Monitoring MD3200 Series System Performance Performance Monitor Table Description Column Headings For more information, see the online help topics Planning MD3200 Series Storage Array Terms and Concepts Configuration Overview User Interface Enterprise Management Window Inheriting the System Settings Select Tools→ Inherit System SettingsSelect Inherit system settings for color and font 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 Name/Rename Storage Arrays dialog appears 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 Battery Settings Setting the Storage Array RAID Controller Module Clocks Configuration About Your Storage Array 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 appears 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 Priority Changing the Virtual Disk Cache Settings 100 Changing the Segment Size of a Virtual Disk 101 Select Virtual Disk→ Change→ Segment Size Changing the I/O Type102 File system typical Database Multimedia Custom Choosing an Appropriate Physical Disk Type103 Physical Disk Security with Self Encrypting Disk 104 105 Creating a Security Key 106 Click Create Key 107 Confirm Change Security Key window is displayed Changing a Security Key108 Click Change Key Saving a Security Key109 Unlocking Secure Physical Disks 110 Erasing Secure Physical Disks Configuring Hot Spare Physical Disks111 Hot Spare Physical Disk Options window is displayed Select Physical disk→ Hot Spare Coverage112 Hot Spares and Rebuild Global Hot SparesClick Unassign 113 Hot Spare Drive Protection Hot Spare Operation114 115 Enclosure Loss ProtectionCriteria for Enclosure Loss Protection RAID Level Host-to-Virtual Disk Mapping 116 Creating Host-to-Virtual Disk Mappings 117 Modifying and Removing Host-to-Virtual Disk Mapping 118 Changing Controller Ownership of the Virtual Disk 119 Select Virtual Disk→ Change→ Ownership/Preferred Path Removing Host-to-Virtual Disk Mapping120 Select Disk Group→ Change→ Ownership/Preferred Path 121 Restricted Mappings Changing the RAID Level of a Disk GroupSelect Disk Group→ Change→ RAID Level 122 123 124 Changing the RAID Level of a Disk Group 125 Storage Partitioning 126 127 Select Disk Group→ Add Free Capacity Physical Disks Disk Group and Virtual Disk Expansion128 Using Free Capacity Using Unconfigured CapacityVirtual Disk Expansion 129 Disk Group Migration Export Disk GroupExporting a Disk Group Non-Exportable Components Importing a Disk Group Import Disk Group131 Non-Importable Components Storage Array Media Scan132 Changing Media Scan Settings 133 Suspending the Media Scan 134 Configuration Premium Feature- Snapshot Virtual Disks 135 Creating a Snapshot Virtual Disk Using the Simple Path 136 About the Simple Path 137 138 139 About the Advanced Path Creating a Snapshot Virtual Disk Using the Advanced Path140 141 142 Creating the Snapshot Using the Advanced Path 143 Specify Virtual Disk Parameters window is displayed 144 Specifying Snapshot Virtual Disk Names 145 Snapshot Repository Capacity 146 147 Add Physical Disks window closes Click Add Physical Disks148 Select Virtual Disk→ Snapshot→ Re-create Re-creating Snapshot Virtual Disks149 Disabling a Snapshot Virtual Disk 150 Preparing Host Servers to Re-create a Snapshot Virtual Disk 151 Select Virtual Disk → Snapshot→ Re-create Re-creating a Snapshot Virtual Disk152 Configuration Premium Feature- Virtual Disk Copy 153 Creating a Virtual Disk Copy for an Mscs Shared Disk 154 Virtual Disk Copy Restrictions Virtual Disk Read/Write Permissions155 Creating a Virtual Disk Copy 156 Before you Begin Virtual Disk Copy and Modification OperationsCreate Copy Wizard 157 Preferred RAID Controller Module Ownership Failed RAID Controller ModuleFailed Virtual Disk Copy 158 Copying the Virtual Disk Copy Manager159 Storage Array Performance During Virtual Disk Copy 160 Setting Copy Priority Stopping a Virtual Disk CopySelect Change→ Copy Priority 161 Preparing Host Servers to Recopy a Virtual Disk Recopying a Virtual Disk162 Recopying the Virtual Disk 163 Select Copy→ Re-Copy Removing Copy Pairs164 165 166 Configuration Device Mapper Multipath for Linux 167 Prerequisite Steps Using DM Multipathing Devices168 Scan for Newly Added Virtual Disks Device Mapper Configuration Steps169 170 Add a New Partition to Device Mapper Create a New fdisk Partition on a Multipath Device Node171 Create a File System on a Device Mapper Partition Mount a Device Mapper PartitionReady for Use Important Information About Special Partitions Device Mapper Commands Descriptions 173 Limitations and Known Issues 174 175 TroubleshootingQuestionAnswer 176 Downloading RAID Controller and Nvsram Packages 177 Downloading Both RAID Controller and Nvsram Firmware 178 Click Transfer 179 Downloading Only Nvsram Firmware 180 Upgrade RAID Controller Module Firmware window appears Select Tools→ Upgrade RAID Controller Module Firmware181 182 Downloading Physical Disk Firmware 183 184 AMW, select Advanced→ Maintenance→ Download→ EMM Firmware Downloading MD1200 Series Expansion Module EMM FirmwareDownload Environmental EMM Firmware dialog appears 185 Self-Monitoring Analysis and Reporting Technology Smart 186 Media Errors and Unreadable Sectors 187 188 Recommended Tools Management Installing Array Components189 Installing the Front Bezel Front Bezel OptionalRemoving the Front Bezel 190 Safety Models AMT, E03J, and E04J Hard DrivesRemoving a Drive Blank 191 Removing a Hard Drive Installing a Drive Blank192 Removing and Installing a Hard Drive 193 Installing a Hard Drive 194 Removing a Hard Drive From a Hard-Drive Carrier 195 196 Installing a Hard Drive Into a Drive Carrier RAID Controller ModuleRemoving a RAID Controller Module Blank 197 Installing a RAID Controller Module Blank 198 Removing a RAID Controller Module 199 Opening the RAID Controller Module Installing a RAID Controller Module200 Closing the RAID Controller Module 201 Removing the RAID Controller Module Backup Battery Unit RAID Controller Module Backup Battery Unit202 Installing the RAID Controller Module Backup Battery Unit 203 Removing a Power Supply/Cooling Fan Module Power Supply/Cooling Fan Module204 Installing a Power Supply/Cooling Fan Module 205 Removing the Control Panel Control Panel206 207 Installing the Control Panel 208 Removing the Backplane Backplane209 210 16. Removing and Installing the Backplane-PowerVault MD3200 17. Removing and Installing the Backplane-PowerVault MD3220 Installing the Backplane 212 Viewing the Firmware Inventory Management Firmware Inventory213 214 Microsoft Services Virtual Disk ServiceVolume Shadow-Copy Service Management System Interfaces 216 Troubleshooting Your Storage Array Software Start-Up RoutineDevice Health Conditions 217 218 On the Setup tab, select Manage a Storage ArrayStatus Icon Description 219 Additional Status Icons Description Storage Array Support Data 220 Enter the Execution summary Automatically Collect the Support Bundle Data221 Event Log Collecting the Physical Disk Data222 Recovery Guru 223 Select Storage Array→ View→ Profile Storage Array Profile224 225 Viewing the Physical Associations Viewing the Logical Associations226 Finding Nodes 227 Using Go To Select Find all free capacity nodesClick Find Next 228 Recovering From an Unresponsive Storage Array Condition 229 230 231 Locating a Physical Disk 232 Select Physical Disk→ Blink→ Expansion Enclosure Locating an Expansion Enclosure233 Capturing the State Information 234 SMrepassist Utility 235 Unidentified Devices Recovering From an Unidentified Storage Array236 237 238 Starting or Restarting the Host Context Agent Software 239 240 Troubleshooting Your Array Troubleshooting Loss of CommunicationTroubleshooting External Connections 241 Troubleshooting Power Supply/Cooling Fan Module 242 Troubleshooting Expansion Enclosure Management Modules Troubleshooting Array Cooling Problems243 Troubleshooting RAID Controller Modules 244 245 Troubleshooting Hard Drives 246 Troubleshooting Array and Expansion Enclosure Connections 247 Troubleshooting a Wet Storage Array 248 Conditions Troubleshooting a Damaged Array249 ECC Errors PCI ErrorsInvalid Storage Array Critical Conditions Noncritical Conditions 251 252 Getting Help Contacting DellVisit support.dell.com Click All Support from Support menu 254 Index 255 256 257 258 259 260