Dell Computer Drive manual Snapshot Virtual Disks

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•Snapshot Repository Virtual Disk Full Conditions — You can choose whether to fail writes to the source virtual disk or fail the snapshot virtual disk when the snapshot repository virtual disk becomes full.

•Host-to-Virtual Disk Mapping — Choose whether to map the snapshot virtual disk to a host or host group now or to map the snapshot virtual disk later. The default setting is Map later.

Preparing Host Servers to Create the Snapshot Using the Advanced Path

NOTICE: Before using the Snapshot Virtual Disks Premium Feature in a Microsoft® Windows® clustered configuration, you must first map the snapshot virtual disk to the cluster node that owns the source virtual disk. This ensures that the cluster nodes correctly recognize the snapshot virtual disk.

Mapping the snapshot virtual disk to the node that does not own the source virtual disk before the Snapshot enabling process is completed can result in the operating system mis-identifying the snapshot virtual disk. This, in turn, can result in data loss on the source virtual disk or an inaccessible snapshot.

For details on mapping the snapshot virtual disk to the secondary node, refer to the Dell PowerEdge™ Cluster SE600W Systems Installation and Troubleshooting Guide on support.dell.com

The destination of a snapshot repository virtual disk is determined based on the free capacity available in the disk group. A snapshot repository virtual disk requires a minimum 8 MB of free capacity. You can choose your preferred creation path—simple or advanced—if the disk group of the source virtual disk has the required amount of free space.

If 8 MB of free capacity is not available in the disk group of the source virtual disk, the Create Snapshot Virtual Disks feature defaults to the advanced path (see "Creating a Snapshot Virtual Disk Using the Advanced Path" on page 73). In the advanced path option, you can choose to place the snapshot repository virtual disk in another disk group or you can use unconfigured capacity on the storage array to create a new disk group.

NOTE: You can create concurrent snapshots of a source virtual disk on both the source disk group and on another disk group.

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Snapshot Virtual Disks

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Contents Dell PowerVault Modular Disk Storage Manager User’s Guide W . d e l l . c o m s u p p o r t . d e l l . c o mFebruary Contents Connecting the Serial Cable System Setup for Password Reset Viewing iSCSI Statistics and Setting Baseline Disk Groups and Virtual Disks Premium Feature-Snapshot Virtual Disks Troubleshooting Problems 101 Contents About This Guide User InterfaceModify Tab Configure TabSummary Tab Support Tab Tools TabISCSI Tab Other Information You May Need View online help View the event logAccess Virtual Disk About Your Storage ArrayOut-of-Band and In-Band Management Manual Addition of a Storage Array Adding Storage ArraysAutomatic Discovery of Storage Arrays Naming Storage Arrays Removing Storage ArraysSetting Up Your Storage Array Initial setup tasks includeStorage Array Storage Array Support Data Setting a PasswordTo set, change, or remove a password for a storage array Connecting the Serial Cable Resetting a PasswordPassword Guidelines Consider these guidelines when you create a passwordSystem Setup for Password Reset Microsoft Windows Operating SystemsReset Password Changing Expansion Enclosure ID Numbers Configuring Alert NotificationsConfiguring E-mail Alerts Storage Array Configuring Snmp Alerts Starting or Restarting the Host-Agent Software in Windows Starting or Restarting the Host-Agent Software in LinuxStorage Array Storage Array Using iSCSI Using the iSCSI TabCreating Chap Secrets Changing the iSCSI Target AuthenticationEntering Mutual Authentication Permissions Valid Ascii Characters for Chap Secrets Space Using iSCSI Type the alias in the iSCSI target alias field and click OK Changing the iSCSI Target IdentificationChanging the iSCSI Target Discovery Configuring the MD3000i iSCSI Host Ports Advanced iSCSI Host Ports SettingsLowest priority default Viewing or Ending an iSCSI SessionViewing iSCSI Statistics and Setting Baseline Statistics Edit, Remove, or Rename Host Topology Host Topology Actions Desired Action Using iSCSI Enabling the Event Monitor Service Status area, click Start LinuxEvent Monitor Disabling the Event Monitor Configuring Host Access About Your HostAutomatic Configuration Manual Configuration using SAS HBAManual Configuration using iSCSI Click NextRemoving Host Access Adding a Host to a Host Group Host GroupsCreating a Host Group Removing a Host From a Host Group Moving a Host to a Different Host GroupHost Topology Removing a Host GroupHost Context Agent Failover with Red Hat Enterprise Linux Create a virtual disk and map it to LUN Reboot the hostData Path Protection About Your Host Disk Groups and Virtual Disks Creating Disk Groups and Virtual Disks Manual Configuration Disk Groups and Virtual Disks Disk Groups and Virtual Disks Automatically Configuring Hot Spares Hot Spare Drive ProtectionManually Configuring Hot Spares Click OK in the dialog boxModifying and Removing Host-to-Virtual Disk Mapping Host-to-Virtual Disk MappingCreating Host-to-Virtual Disk Mappings Storage Partitioning Changing Controller Ownership of the Virtual DiskVirtual Disk Expansion Disk Group and Virtual Disk ExpansionDisk Group Expansion Storage Array Media Scan Changing Media Scan SettingsErrors discovered by the media scan include Suspending the Media Scan Microsoft ServicesVirtual Disk Service Volume Shadow-Copy Service Disk Groups and Virtual Disks Premium Feature-Snapshot Virtual Disks Creating a Snapshot Virtual Disk Using the Simple Path About the Simple PathHost-to-Virtual Disk Mapping The default setting is Map now SMrepassist -ffilename-identifier Creating the Snapshot Using the Simple Path Snapshot Virtual Disks Creating a Snapshot Virtual Disk Using the Advanced Path About the Advanced PathSnapshot Virtual Disks SMrepassist -ffilename-identifier Creating the Snapshot Using the Advanced Path Snapshot Virtual Disks Specifying Snapshot Virtual Disk Names Source-virtual disk-name-sequence-numberSnapshot Repository Capacity Re-creating Snapshot Virtual Disks Disabling a Snapshot Virtual DiskTo disable a snapshot virtual disk Preparing Host Servers to Re-create a Snapshot Virtual DiskRe-creating a Snapshot Virtual Disk Premium Feature-Virtual Disk Copy Creating a Virtual Disk Copy for an Mscs Shared Disk Reasons to use virtual disk copy include the followingIf you are using the target virtual disk for backup purposes Virtual Disk Read/Write PermissionsVirtual Disk Copy Restrictions Creating a Virtual Disk Copy Preparing Host Servers to Create a Virtual Disk CopyClick Next at the bottom Copying the Virtual DiskChoose the target virtual disk Setting Copy Priority Storage Array Performance During Virtual Disk CopyTo stop a virtual disk copy, complete the following steps Stopping a Virtual Disk CopyRecopying a Virtual Disk Click Yes to stop the virtual disk copyPreparing Host Servers to Recopy a Virtual Disk Recopying the Virtual Disk Removing Copy Pairs Virtual Disk Copy Firmware Downloads Downloading RAID Controller and Nvsram PackagesDownloading Both RAID Controller and Nvsram Firmware Downloading Only Nvsram Firmware Downloading Non-redundant Mscs Nvsram FirmwareDownloading Physical Disk Firmware Downloading EMM Firmware 100 Storage Array Profile Troubleshooting ProblemsRecovery Guru Device Health ConditionsSMrepassist Utility 102103 Support Information PackageClick Browse Recovering from an Unidentified Storage Array Unidentified DevicesPing host-name-or-IP-address-of-the-host 105Troubleshooting 107 Removing an EMM from the Expansion EnclosureInserting an EMM into an Expansion Enclosure 108 MD3000 Maintenance ConsiderationsRemoving and Inserting Physical Disks 109 110 Index 111Index 113 114