HP P6000 manual Mirrorclones, Mirrorclone guidelines

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capacity available to create virtual disks decreases. Before you allocate space for new virtual disks, ensure that you reserve enough space for all demand-allocated snapshots in the disk group.

The capacity required for a demand-allocated snapshot depends on how much of the source disk is modified. This value is unique for each application, but can range from 0% to 100% of the source disk capacity. If you do not know the capacity required for a demand-allocated snapshot, HP recommends that you reserve a minimum of 10% of the capacity of the source virtual disk times the number of snapshots of the source disk. For example, if you have two demand-allocated snapshots of a 500 GB virtual disk, you would reserve 100 GB (500 GB x 10% x 2) of usable capacity. Compute the usable capacity using the redundancy (Vraid) level selected for the snapshot. If the availability of demand-allocated snapshots is critical for application availability, overestimating the requirements for free space may be warranted.

Always monitor free space. In addition to demand-allocated snapshots, a disk failure and the subsequent reconstruction can also compete for free space. After a reconstruction, the reserved space requirements for the disk protection level can cause existing snapshots to exceed available free space and thus cause all snapshots to become inoperative.

Mirrorclones

Mirrorclone replication establishes and maintains a copy of an original virtual disk via a local replication link.

When a mirrorclone contains exactly the same data as the source virtual disk, the mirrorclone is said to be synchronized. In a synchronized state, the mirrorclone is automatically updated whenever the source virtual disk is updated.

When local replication between a synchronized mirrorclone and its source is stopped by the user, the mirrorclone is said to be fractured. In a fractured state, the mirrorclone is not updated when the source virtual disk is updated. At the instant replication is stopped, the mirrorclone is a point-in-time copy of its source. Although a fractured mirrorclone is no longer being replicated, it maintains a relationship with its source virtual disk. This allows the mirrorclone to resynchronize with its source without requiring a complete resynchronization.

When the relationship between a fractured mirrorclone and its source virtual disk is severed, the mirrorclone is said to be detached. A detached mirrorclone is an independent virtual disk and cannot be reattached to its parent virtual disk.

This feature is available only with certain controller software versions.

Mirrorclone guidelines

Follow these guidelines for using mirrorclones:

•The array must have a local replication license.

•A mirrorclone can be in a different disk group than the source. For optimum protection from hardware failures, HP recommends creating a mirrorclone in a different disk group than the source.

•A mirrorclone delta restore can be made when the mirrorclone source is also the source for a DR group.

•The redundancy (Vraid) level of a mirrorclone can be the same, lower, or higher than the source.

•The maximum number of mirrorclones per source is one.

•A detached mirrorclone cannot be reattached to its source. (You can remove a mirrorclone from its source virtual disk, to make it an independent virtual disk. This action is called detaching the mirrorclone.)

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Contents Abstract HP P6000 Command View User GuideSee Internet Protocol support Contents Troubleshooting HP P6000 Command View Configuring HP P6000 Command View advanced tasksMaintaining and managing HP P6000/EVA storage systems Monitoring storage system eventsComponents HP array event code formats and descriptions Support and other resourcesGlossary 100 Index 103 Overview HP P6000 Command View software suitePrerequisites Server-based and array-based management HP P6000 Command View featuresServer-based configuration HP Management Integration Framework Array-based configurationUser interface Hardware-SeeHardware Storage systems point of viewSettings point of view Settings point of viewBrowsing to server-based HP P6000 Command View Accessing HP P6000 Command ViewRunning server-based HP P6000 Command View from the desktop Browsing to array-based HP P6000 Command ViewIP address formats Internet Protocol supportServer-based HP P6000 Command View security groups Managing security and passwordsArray-based HP P6000 Command View security groups Password protection for storage systemsPassword formats Enabling management of a password-protected storage systemConsiderations Setting a password for HP EVA storage systems Disabling management of a password-protected storage systemSingle sign-on from HP Systems Insight Manager Disabling management of a password-protected storage systemManaging security and passwords Licenses to use and license keys Licensing HP P6000/EVA storage systemsLicense types Instant-on licensesModel upgrade support Model upgrade licensingData migration licenses Fcip licensesActivating an instant-on license Configuring email to receive LTUsRetrieving licenses Entering license keysValidating the license Importing licensesAdding an LTU Displaying temporary license expiration date Deleting incorrectly entered license keysDisk groups Provisioning storageWorking with disk groups Disk group types Disk typesGeneral guidelines Disk group capacity Disk group occupancy and occupancy alarm levelNumber of physical disks in a group Redundancy Vraid levels Virtual disks Working with virtual disks in HP P6000 Command ViewVirtual disks Hosts Working with hosts in HP P6000 Command ViewOnline virtual disk migration PresentationMirrorclone migration Thin provisioningThin provisioned disk HP P6000 Business Copy software Replicating storageSnapclones Snapshot types SnapshotsSnapshot guidelines Monitoring snapshot spaceMirrorclone guidelines MirrorclonesFractured mirrorclone guidelines Synchronized mirrorclone guidelinesMirrorclone states ContainersOptimizing replication performance Using containers preallocationPlanning for host I/O workloads Optimizing snap creationMinimizing the number of snapshots Minimizing snapclone workloadsMinimizing simultaneous replication operations Working with DR groups in HP P6000 Command View HP P6000 Continuous Access softwareDR groups Data replication protocol options Creating DR groupsReplicating storage Initializing storage systems Maintaining and managing HP P6000/EVA storage systemsUSER-INITIATED Service Mode Active on this Storage System User-initiated service modeStarting the storage system Uninitializing storage systemsShutting down the storage system HSV210A controller rear view Hardware Working with hardware in HP P6000 Command ViewVerifying hardware status Remote service testStorage system identity information Updating HP controller software Using multiple management servers to manage arraysConfiguring iSCSI devices Events overview Monitoring storage system eventsEmail notification Management server event logController termination event log Viewing eventsConfiguring host notification Configuring event notificationViewing additional information Applying a customized host notification list Filtering events by severityRetrieving the parse file Applying a customized event configuration fileSelecting individual events Retrieving the Management Information Base Sending the event file Setting user interface options Configuring HP P6000 Command View advanced tasksCreating page footer messages Setting a remote location for audit logs Setting audit logging optionsChanging the login credentials array-based management Changing port and timeout parametersHttps//managementmoduleIPaddress2373 Running HP P6000 Command View in a multi-homed environmentRestarting the HP P6000 Command View service Troubleshooting HP P6000 Command ViewUsing the right-click menu Optimizing performanceNavigation pane lists duplicate arrays Failed communication link to iSCSI devices Error messages in the user interfaceFailed connection warning for empty controller host ports Failed entities reported on the disk enclosureFailed blower power supply Troubleshooting access to array-based HP P6000 Command ViewFailed transceiver Failed I/O moduleStorage system connection down error message Unexpected behavior when using older Windows HBA driverVirtual disk sizes displayed incorrectly IPFilter page incorrectly displays IPv6 addressWebes 5.5 receiving events inconsistently Version numbers differ\Program Files\Hewlett-Packard\EVA Performance Monitor ComponentsHP P6000 Performance Data Collector valid objecttype values Displaying historical state changes and performance dataHP P6000 Performance Data Collector objectid values Configuring the HP P6000 Command View serverDisplaying HP P6000 Command View access credentials Configuration file for performance and state data loggingLogging configuration file Configuring HP P6000 Performance Data CollectorEvents and logs Connecting to HP P6000 Performance Data Collector remotely Configuration recommendationsSSL protocol Prohibited commandsBackward compatibility Using friendly namesCreating the friendly names host file Adding friendly namesAdding friendly names manually Mapping worldwide names to friendly namesUsing short names Viewing arrays Using the command line interfaceSpecifying the output Refreshing dataSpecifying data output in multiple files Filtering dataHP P6000 Performance Data Collector commands CommandsLuns HP P6000 Performance Data Collector command modifiers Command modifiersNots Using the graphical user interfacePage Data filtering Configure filteringObjects and counters HP EVA storage controller HP EVA storage arrayHP EVA virtual disk HP EVA virtual disk group HP EVA host port statistics HP EVA host connectionHP EVA physical disk group HP EVA physical diskHP EVA DR tunnels HP EVA DR Group Information Contacting HP Support and other resourcesRelated information Websites Typographical conventionsDocument conventions Event code format HP array event code formats and descriptionsEvent code types and descriptions Software component IDsEvent information packet EIP types Corrective action codesHP array event information packet EIP types HP array coupled crash control codes Coupled crash control codesHP array dump/restart control codes Dump/restart control codesEVA GlossarySAN See also virtual disk CLI IndexIndex 105
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