Dell MD3600f, MD3620F owner manual Troubleshooting, 228, Question Answer

Page 228

Troubleshooting

Question

Answer

 

 

How can I check if multipathd

Run the following command

is running?

/etc/init.d/multipathd status

 

Why does the multipath

First verify if the devices are discovered or not. The

–llcommand output not

command #cat /proc/scsi/scsi displays all

show any devices?

the devices that are already discovered.

 

Then verify the multipath.conf to ensure that it is

 

updated with proper settings.

 

After this, run multipath. Then run multipath

 

–ll, the new devices must be displayed.

Why is a newly-mapped LUN

Run “rescan_dm_devs” in any directory. This must

not assigned a multipathing

bring up the devices.

device node?

 

I have no LUNs mapped before. Then I map a few LUNs. After running rescan-scsi- bus.sh, LUN 0 does not show up.

Run rescan_dm_devs instead of rescan- scsi-bus for LUN 0 reconfiguration.

I removed a LUN, but the multipathing mapping is still present.

The multipathing device is still there after you remove the LUNs. Run multipath –f<device node for the deleted LUN> to remove the multipathing mapping. For example, if device devices related with /dev/dm-1 are deleted, you must run multipath –f /dev/dm-1to remove /dev/dm-1 from DM mapping table. If multipathing daemon is stopped/restarted, run multipath –Fto flush out all stale mappings.

Failback does not happen as expected with the array.

Sometimes the low level driver cannot auto-detect devices coming back with the array. Run rescan_dm_devs to do a rescan of the host server SCSI bus and re-aggregate devices at multipathing layer.

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Configuration: Device Mapper Multipath for Linux

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Contents Dell PowerVault MD3600f and MD3620f Storage Arrays Dell Inc Contents Cache Functions and Features Planning MD3600f Series Storage Array Terms and ConceptsVirtual Disk Operations Limit Configuration About Your Configuring Alert Notifications Configuring E-mail AlertsEnabling or Disabling the Event Monitor Moving a Host to a Different Host GroupStarting or Stopping the Host Context Agent Managing Host Port Identifiers101 111112 120132 136137 138146 148152 157Types of Virtual Disk Copies 170 171172 Virtual Disk Copy Restrictions 173Storage Array Performance During 178Stopping a Virtual Disk Copy 179 Preparing Host Servers to Recopy a 180Virtual Disk Expansion With 189 Configuration Device Mapper 219Using DM Multipathing Devices 220 Removing the Front Bezel 242 Installing the Front Bezel228 Downloading RAID ControllerPower Supply/Cooling Fan Module 257 243249 255Viewing the Firmware Inventory 271274 275Recovering From an Unresponsive Storage 284 Safety First-For You and Your Array 295Troubleshooting an SFP Transceiver 295 Troubleshooting Power Supply/Cooling 298311 Contents Introduction About This DocumentDell PowerVault Modular Disk Storage Manager MD3600f Series Storage ArrayOther Information You May Need Introduction Planning About Your Storage Array OverviewHardware Features Front-Panel Features and IndicatorsPlanning About Your Storage Array Item Indicator, Button, or Icon Description Connector Back Panel Features and Indicators Hard-Drive Indicator Patterns Hard Drive IndicatorsPower Supply and Cooling Fan Features Drive-Status Indicator Pattern ConditionPower Indicator Codes and Features Planning RAID Controller Modules RAID Controller ModulesRAID Controller Module Connectors and Features FunctionComponent Function RAID Controller Module-Additional Features Battery Backup UnitHost Channel LED Link/Rate Indications Cache Functions and Features System Password ResetStorage Array Thermal Shutdown Cache MirroringSFP Transceivers, Fiber Optic, and SAS Cables Write-Back CacheWrite-Through Cache Fiber Optic Cable Connection Interoperability of 2 Gbps, 4 Gbps, and 8 Gbps Devices Planning MD3600f Series Storage Array Terms and Concepts Physical Disks, Virtual Disks, and Disk GroupsPhysical Disks Physical Disk StatesSelf-Monitoring Analysis and Reporting Technology Virtual Disks and Disk GroupsVirtual Disk States RAID Controller Virtual Disk States DescriptionRAID Levels RAID Level UsageRAID Segment Size Virtual Disk OperationsVirtual Disk Initialization Background Initialization Foreground InitializationConsistency Check Media VerificationCycle Time Virtual Disk Operations LimitDisk Group Operations RAID Level MigrationSegment Size Migration Virtual Disk Capacity Expansion Disk Group ExpansionDisk Group Defragmentation Disk Group Operations LimitRAID Background Operations Priority Virtual Disk Migration and Disk Roaming Disk MigrationPlanning MD3600f Series Storage Array Terms and Concepts Advanced Features Disk RoamingHost Server-to-Virtual Disk Mapping Host Types Snapshot Virtual DisksSnapshot Repository Virtual Disk Virtual Disk CopyVirtual Disk Recovery Source Virtual DiskTarget Virtual Disk Using Snapshot and Disk Copy Together Multi-Path SoftwarePreferred and Alternate Controllers and Paths Load Balancing Virtual Disk OwnershipMonitoring MD3600f Series System Performance Planning MD3600f Series Storage Array Terms and Concepts Performance Monitor Table Description Column Headings Planning MD3600f Series Storage Array Terms and Concepts Configuration Overview User InterfaceEnterprise Management Window Inheriting the System Settings Array Management WindowConfiguration Overview Out-of-Band Management In-Band ManagementStorage Arrays Adding Storage ArraysAutomatic Discovery of Storage Arrays Manual Addition of a Storage ArraySelect Edit→ Add Storage Array Setting Up Your Storage Array Locating Storage Arrays Naming or Renaming Storage ArraysAMW, select Storage Array→ Blink→ Storage Array Stop All IndicationsAMW Setup tab, select Rename Storage Array Name/Rename Storage Arrays dialog is displayedSetting a Password Type the New passwordPassword Guidelines Viewing Storage Array ConnectionsAdding/Editing a Comment to an Existing Storage Array Removing Storage ArraysSelect Edit→ Comment Select Edit→ Remove→ Storage ArrayEnabling Premium Features Failover Alert DisplayChanging the Cache Settings on the Storage Array Changing Expansion Enclosure ID NumberChange→ Enclosure ID Configuring Alert Notifications Select Configure AlertsChanging the Enclosure Order in the Physical Pane 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 Enabling or Disabling the Event Monitor WindowsLinux Select Action→ PropertiesConfiguration About Your Host Configuring Host AccessUsing the Mappings Tab Defining a HostSelect Mappings→ Define→ Host Removing Host Access Managing Host GroupsSelect Mappings→ Remove Creating a Host Group Select Mappings→ Define→ Host GroupAdding a Host to a Host Group Removing a Host From a Host GroupMoving a Host to a Different Host Group Removing a Host GroupSelect Mappings→ Move Host Topology Starting or Stopping the Host Context AgentLinux Data Path Protection WindowsClick Action→ Start Managing Host Port Identifiers Add Host Port Identifier dialog is displayed Configuration About Your Host 100 Creating Disk Groups and Virtual Disks 101Creating Disk Groups Introduction Create Disk Group window is displayed102 103 Locating a Disk Group Creating Virtual Disks104 105 Map later Using Mappings View Changing the Virtual Disk Modification Priority106 Changing the Virtual Disk Cache Settings 107108 Changing the Segment Size of a Virtual Disk 109Changing the I/O Type Select Virtual Disk→ Change→ Segment Size110 Choosing an Appropriate Physical Disk Type File system typical Database Multimedia Custom111 Physical Disk Security With Self Encrypting Disk 112Shows how to interpret the security status of a disk group 113Creating a Security Key 114Click Create Key 115Changing a Security Key 116Saving a Security Key Click Change Key117 Validate Security Key 118Unlocking Secure Physical Disks Erasing Secure Physical Disks119 Configuring Hot Spare Physical Disks Select Physical disk→ Hot Spare Coverage120 Hot Spare Physical Disk Options window is displayed Click Unassign121 Hot Spares and Rebuild Global Hot SparesHot Spare Operation 122Enclosure Loss Protection Hot Spare Drive Protection123 124 Criteria for Enclosure Loss Protection RAID LevelHost-to-Virtual Disk Mapping 125Creating Host-to-Virtual Disk Mappings 126Modifying and Removing Host-to-Virtual Disk Mapping Mapping127 Changing Controller Ownership of the Virtual Disk 128Removing Host-to-Virtual Disk Mapping Select Virtual Disk→ Change→ Ownership/Preferred Path129 Changing the RAID Level of a Disk Group Select Disk Group→ Change→ Ownership/Preferred Path130 Removing a Host-to-Virtual Disk Mapping Using Linux Dmmp Select Disk Group→ Change→ RAID Level131 Restricted Mappings 132Mapping Restrictions Operating System Highest LUN 133 134 135 Changing the RAID Level of a Disk Group 136Storage Partitioning 137Disk Group and Virtual Disk Expansion Select Disk Group→ Add Free Capacity Physical Disks138 Using Free Capacity Virtual Disk Expansion139 Using Unconfigured Capacity Disk Group MigrationExport Disk Group Non-Exportable ComponentsImport Disk Group Exporting a Disk Group141 Importing a Disk Group Non-Importable Components142 Changing Media Scan Settings Storage Array Media Scan143 Suspending the Media Scan 144Configuration Premium Feature- Snapshot Virtual Disks 145Scheduling a Snapshot Virtual Disk Common Reasons for Scheduling a Snapshot Virtual Disk146 Guidelines for Creating Snapshot Schedules 147Creating a Snapshot Virtual Disk Using the Simple Path Enabling and Disabling Snapshot SchedulesScheduled Snapshot Icons 148About the Simple Path 149150 Select Virtual Disk→ Snapshot→ Create. or 151Creating a Snapshot Virtual Disk Using the Advanced Path About the Advanced Path152 153 154 155 Creating the Snapshot Using the Advanced Path 156Specifying Snapshot Virtual Disk Names Specify Virtual Disk Parameters window is displayed157 158 Snapshot Repository Capacity 159Click Add Physical Disks 160Add Physical Disks window closes 161Disabling a Snapshot Virtual Disk 162Preparing Host Servers to Re-create a Snapshot Virtual Disk 163Re-creating Snapshot Virtual Disks Snapshot RollbackSelect Virtual Disk→ Snapshot→ Re-create 164Rules and Guidelines for Performing a Snapshot Rollback 165Command Line Options Protecting Against a Failed Snapshot RollbackPrevious Versions of the MD Storage Manager Starting a Snapshot RollbackResuming a Snapshot Rollback RollbackConfirm Rollback Snapshot Virtual Disk dialog is displayed 167Canceling a Snapshot Rollback 168183 184 Configuration Premium Feature- Virtual Disk Copy 169Types of Virtual Disk Copies Offline Copy170 Online Copy 171Creating a Virtual Disk Copy for an Mscs Shared Disk Virtual Disk Read/Write Permissions172 Virtual Disk Copy Restrictions 173Creating a Virtual Disk Copy Before You Begin174 Virtual Disk Copy and Modification Operations Create Copy WizardFailed Virtual Disk Copy 175Preferred RAID Controller Module Ownership Failed RAID Controller ModuleCopy Manager 176Copying the Virtual Disk 177Setting Copy Priority Storage Array Performance During Virtual Disk CopyAMW, select Virtual Disk→ Copy Manager 178Stopping a Virtual Disk Copy Recopying a Virtual DiskSelect Change→ Copy Priority 179Preparing Host Servers to Recopy a Virtual Disk 180Re-Copying a Virtual Disk Select Copy→ Re-Copy181 Removing Copy Pairs Select Copy→ Remove Copy Pairs182 Configuration Premium Feature- Remote Replication 185Activating Remote Replication Replication Repository Virtual Disks186 RAID Levels for Replication Repository Virtual Disks Primary and Secondary Virtual Disk Pairs187 Using Remote Replication With Other Features Storage Partitioning With Remote Replication188 Snapshot Virtual Disk With Remote Replication Virtual Disk Copy With Remote ReplicationVirtual Disk Expansion With Remote Replication 189Required Switch Zoning Configurations Switch CascadingZoning Guidelines for Remote Replication 190Setting Up and Managing Remote Replication Journaling File Systems and Remote ReplicationPrerequisites 191192 Preview Activate Remote Replication wizard is displayed Completed Activate Remote Replication message is displayed193 Creating a Remote Replication 194Setting the Write Mode Selecting the Secondary Virtual Disk195 Setting Synchronization Priority and Synchronization Method 196Completing the Remote Replication 197RAID Controller Module Ownership/Preferred Path 198Viewing the Storage Array Profile 199Viewing the Properties Pane Viewing Logical Elements of the Secondary Virtual DiskSelect View Associated Logical Elements 200201 Changing Write Mode and Consistency Group Membership Write Mode and Consistency Group Membership IconStatusVirtual Disk Status Icons 202Select Change→ Write Mode 203Resynchronizing Virtual Disks Normally Synchronized Virtual Disks204 Changing Synchronization Priority and Method 205206 Unsynchronized Virtual Disks 207Automatically Resynchronizing Virtual Disks Manually Resynchronizing Virtual Disks208 209 Suspending a Remote Replication 210Resuming a Remote Replication About Resumed Remote Replications211 Select Test Replication Communication 212Deleting a Primary Virtual Disk 213Deleting a Secondary Virtual Disk 214Removing a Remote Replication From a Storage Array 215Deactivating the Remote Replication on the Storage Array 216Disabling the Remote Replication Premium Feature 217218 Configuration Device Mapper Multipath for Linux 219Using DM Multipathing Devices Prerequisites220 Device Mapper Configuration Steps Scan for Newly Added Virtual Disks221 222 Create a New fdisk Partition on a Multipath Device Node Add a New Partition to Device Mapper223 Create a File System on a Device Mapper Partition Mount a Device Mapper PartitionReady for Use 224Blacklist Local Drive in Multi-path Driver Important Information About Special Partitions225 Device Mapper Commands Descriptions 226Limitations and Known Issues 227Troubleshooting 228Question Answer Downloading RAID Controller and Nvsram Packages 229Downloading Both RAID Controller and Nvsram Firmware 230Select Tools→ Upgrade RAID Controller Module Firmware Click Transfer231 Downloading Only Nvsram Firmware 232233 234 Downloading Physical Disk Firmware 235Download Physical Disk Introduction window is displayed 236AMW, select Advanced→ Maintenance→ Download→ EMM Firmware Downloading MD1200 Series Expansion Module EMM FirmwareDownload Environmental EMM Firmware dialog is displayed 237Self-Monitoring Analysis and Reporting Technology Smart 238Media Errors and Unreadable Sectors 239240 Recommended Tools 241Installing the Front Bezel Front Bezel OptionalRemoving the Front Bezel 242Safety Models AMT, E03J, and E04J Hard DrivesRemoving a Hard-Drive Blank 243Installing a Hard-Drive Blank Removing a Hard Drive244 Removing and Installing a Hard Drive 245Installing a Hard Drive 246Removing a Hard Drive From a Hard-Drive Carrier 247248 Installing a Hard Drive Into a Hard-Drive Carrier RAID Controller ModuleRemoving a RAID Controller Module Blank 249Installing a RAID Controller Module Blank 250Removing a RAID Controller Module 251Installing a RAID Controller Module 252Opening the RAID Controller Module 253Closing the RAID Controller Module 254RAID Controller Module Backup Battery Unit Removing the RAID Controller Module Backup Battery Unit255 Installing the RAID Controller Module Backup Battery Unit 256Power Supply/Cooling Fan Module Removing a Power Supply/Cooling Fan Module257 Installing a Power Supply/Cooling Fan Module 258Control Panel Removing the Control Panel259 260 Installing the Control Panel 261Backplane Removing the Backplane262 263 16. Removing and Installing the Backplane-PowerVault MD3600f 17. Removing and Installing the Backplane-PowerVault MD3620fInstalling the Backplane 265266 Viewing the Firmware Inventory 267268 Microsoft Services Virtual Disk ServiceVolume Shadow-Copy Service 269270 Start-Up Routine Device Health Conditions271 Start-Up Routine Indications Look/Listen for ActionOn the Setup tab, select Manage a Storage Array 272Status Icon Description 273 Additional Status Icons DescriptionStorage Array Support Data 274Automatically Collect the Support Bundle Data Enter the Execution summary275 Collecting the Physical Disk Data 276Event Log 277Recovery Guru Storage Array Profile278 279 Viewing the Logical Associations Select View→ Associated Logical Elements. or280 Viewing the Physical Associations Finding Nodes281 Select Find all free capacity nodes 282Using Go To Click Find NextSelect View→ Go To→ Snapshot Virtual Disk Select View→ Go To→ Snapshot Repository Virtual DiskRecovering From an Unresponsive Storage Array Condition Select View→ Go To→ Source Virtual DiskSelect View→ Go To→ Target Virtual Disk 284285 286 Locating a Physical Disk Locating an Expansion Enclosure287 Capturing the State Information Select Physical Disk→ Blink→ Expansion Enclosure288 SMrepassist Utility 289Recovering From an Unidentified Storage Array Unidentified Devices290 291 292 Starting or Restarting the Host Context Agent Software 293294 Troubleshooting Loss of Communication Troubleshooting an SFP Transceiver295 296 297 Removing an SFP ModuleTroubleshooting External Connections Troubleshooting Power Supply/Cooling Fan Module298 Troubleshooting Array Cooling Problems 299Troubleshooting Expansion Enclosure Management Modules 300Troubleshooting RAID Controller Modules 301Troubleshooting Hard Drives 302Troubleshooting Array and Expansion Enclosure Connections 303Troubleshooting a Wet Storage Array 304Troubleshooting a Damaged Array 305ECC Errors ConditionsInvalid Storage Array 306PCI Errors Critical ConditionsNoncritical Conditions 307308 Locating Your System Service Tag Contacting Dell309 Documentation Feedback 310Index 312 313 314 315 316 317 318
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MD3620F, MD3600f specifications

Dell's MD3620F and MD3600F storage arrays are designed for businesses seeking dependable, high-performance storage solutions tailored to meet the demands of modern data management. These models offer a blend of scalability, efficiency, and advanced features, making them well-suited for a range of applications, from virtual environments to critical database operations.

One of the primary features of the MD3620F and MD3600F is their support for a hybrid storage architecture. This approach allows organizations to combine flash storage with traditional hard disk drives (HDDs) to optimize performance and cost. The MD3620F focuses heavily on all-flash configurations, delivering exceptional speed and lower latency, ideal for I/O-intensive workloads.

Scalability is another hallmark of these storage solutions. The MD3600F allows users to scale up to 120 drives, providing robust capacity to meet growing data needs. The MD3620F is engineered for environments where data availability and speed are paramount, with support for high IOPS (Input/Output Operations Per Second) and consistent performance under stress.

In terms of data management, both systems integrate with Dell’s proprietary software, which enhances operational efficiency through features like automated tiering. This technology optimizes data placement between different storage types based on access frequency, ensuring that hot data is readily available while reducing costs associated with less critical data.

Reliability is crucial for businesses that depend on their storage systems. The MD3620F and MD3600F come equipped with advanced data protection mechanisms, such as RAID support, which safeguards against data loss, and snapshot capabilities that provide point-in-time copies of data. Moreover, these solutions include hot-swappable components, ensuring minimal downtime for maintenance and repairs.

Connectivity is also a strong suit of these storage arrays. They support multiple connectivity options, including SAS and iSCSI, allowing for flexible integration into existing IT infrastructures. This adaptability enhances their appeal to a wide range of enterprise environments.

In summary, the Dell MD3620F and MD3600F stand out as robust storage solutions with a combination of hybrid and all-flash configurations, scalability, advanced data management tools, and enhanced reliability features. These characteristics make them ideal for organizations looking to enhance their data storage capabilities while maintaining high performance and efficiency.