HP Cluster Software Planning for HP 3PAR Cluster Extension, User configuration file, Force Flag

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Synchronous replication

Using synchronous mode, all write requests from the server are first transferred to the remote storage system. After each I/O has been mirrored in the cache area of the remote storage system, it is acknowledged to the local storage system. The write request is then acknowledged to the server.

User configuration file

HP 3PAR Cluster Extension provides a user configuration file to customize failover behavior. You can specify all customizable objects of HP 3PAR Cluster Extension in this file.

See “User configuration file” (page 47) for more information.

Force Flag

The force flag forces HP 3PAR Cluster Extension to skip the internal logic and enables write access to the local virtual volumes regardless of the Remote Copy volume group member state. You can set this flag when you are sure that the current site contains the latest data, even though a previous application service startup process failed because HP 3PAR Cluster Extension discovered a Remote Copy volume group member state that could not be handled automatically.

To use the force flag feature, before starting the application service that uses HP 3PAR Cluster Extension, you must create a file called application_name.forceflag in the directory specified by the ApplicationDir property. While using clx3PARrun to use the force flag feature, use the operand –forceflag to eliminate the need of creating the application_name.forceflag file . The application_name.forceflag is the name of the HP 3PAR Cluster Extension resource. Before creating this file, ensure that the application service is not running elsewhere. This file is removed after it is detected by HP 3PAR Cluster Extension.

You cannot use the force flag if the local virtual volume state is a combination of secondary and syncing, which indicates that a copy operation is in progress. A disk cannot be put in read/write access mode when a write operation is in progress to that virtual volume; in this case, HP 3PAR Cluster Extension returns a global error.

Planning for HP 3PAR Cluster Extension

Consider the dependencies described in this section before configuring HP 3PAR Cluster Extension.

Cluster setup considerations

Windows clustering

Windows Clustering depends on a quorum resource to maintain a persistent log of cluster configuration changes and status, as well as a single point to resolve any possible events that could result in a split-brain situation. HP 3PAR Cluster Extension supports the following quorum configurations in which one site failure will not cause the entire cluster to fail.

Windows Server 2008/2008 R2/2012

•Node Majority

•Node and File Share Majority

NOTE: HP 3PAR Cluster Extension does not support quorum configuration which includes disk witness.

Node Majority quorum in Windows Clustering

The Node Majority resource ensures that the cluster's configuration data is stored locally on the nodes and that it is kept consistent across the different disks. This allows cluster topologies where the nodes do not need shared access to a quorum disk.

(Number of nodes in the cluster/2) +1

12 HP 3PAR Cluster Extension features

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Contents HP 3PAR Cluster Extension Software Administrator Guide Acknowledgments Contents CLI commands and utilities Troubleshooting Support and other resourcesGlossary Index Integration into cluster software Graphical user interface CLI for easy integrationDisaster tolerance through geographical dispersion Automated redirection of mirrored disks Metropolitan distance supportNo server reboot Synchronous mode supportStorage system configurations Fully Automatic Failover and FailbackTo-1 configuration To-1 configurationTo-1 and 1-to-N configurations Processes and componentsHP 3PAR Remote Copy Remote Copy volume groups Remote Copy pairsUser configuration file Cluster setup considerationsPlanning for HP 3PAR Cluster Extension Force FlagNode Majority with File Share Witness 14 HP 3PAR Cluster Extension features Configuration tool clx3PARconfig.exe HP 3PAR InForm Management Console or HP 3PAR InForm CLIIP network considerations SAN fabric considerationsConfiguring HP 3PAR Cluster Extension Starting the HP 3PAR Configuration ToolIntegrating HP 3PAR Cluster Extension with Msfc Defining the HP 3PAR configuration information using the GUI Configuring HP 3PAR Cluster Extension SystemUser.pwd Defining the HP 3PAR configuration information using the CLI Importing and exporting configuration information Adding a HP 3PAR Cluster Extension resourceAdding HP 3PAR Cluster Extension resource using cluster.exe ExampleConfiguring HP 3PAR Cluster Extension resources Changing a HP 3PAR Cluster Extension resource nameTIP Setting resource properties and values in the GUI Service or application properties and values Using Failover Cluster Management to set resource properties Make the necessary parameter changes, and then click OK Page Configuring cluster node data center assignments Configuring HP 3PAR storage system Selecting a volume group Changing Remote Copy volume group settingsConfiguring takeover actions Setting HP 3PAR Cluster Extension properties using a UCF Cluster resource clxfileshare /privpropSet-ClusterParameter -Name propertyname -Value valuetoset Adding dependencies using Failover Cluster Management Adding dependencies on a HP 3PAR Cluster Extension resourceAdding dependencies using the CLI Adding dependencies using the PowerShellCluster resource Disk32b00b /adddependencyclxfileshare Configuration of HP 3PAR CLX for CSV disk on Windows Server Disaster-tolerant configuration example using a file shareFour nodes host1DCA, host2DCA, host3DCB and host4DCB Service or application example Managing HP 3PAR Cluster Extension resources Bringing a resource onlineDisk3PARLUN25 \cluster resource Clxfileshare /ProP RestartAction=0Using Hyper-V Live Migration with HP 3PAR Cluster Extension Taking a resource offlineDeleting a resource Bouncing service or application Creating array password fileTiming considerations for Windows Clustering Msfc Administration System resources LogsHyper-V Live Migration log entries Configuring HP 3PAR Cluster Extension Page Configuring HP 3PAR Cluster Extension User configuration file Windows ClusteringFile structure ProgramFiles%\Hewlett-Packard\Cluster Extension 3PAR\confCommon objects Specifying object valuesApplication objects LogDirLogLevel ApplicationDirDefault %HPCLX3PARPATH% values ApplicationStartup OptionalClusterNotifyCheckTime ClusterNotifyWaitTimeDCAHosts Required DCBHosts RequiredRCVolumeGroupA Required RCVolumeGroupB RequiredDCA InServStorageSerNum Required DCB InServStorageSerNum RequiredSample configuration file ResyncWaitTimeout OptionalHP3PARCLICommandTimeout StatusRefreshIntervalPage CLI commands Clx3PARrunConfiguring the CLI Configuring the HP 3PAR storage systemCreating the HP 3PAR Remote Copy environment Forceflag optionInstalling HP 3PAR InForm Command Line Interface CLI Creating and configuring the user configuration fileTiming considerations Restrictions for customized implementations Synopsis CSVDiskName StringOutputs \PSAdd-CSVDependencyOnCLX3PAR\PSAdd-CSVDependencyOnCLX3PAR -CSVDiskName Cluster Disk Related Links \PSAdd-VMDependencyOnCLX3PAR Total virtual machines in the cluster residing on CSV \PSAdd-VMDependencyOnCLX3PAR -CSVDiskName Cluster DiskRelated Links Name \PSGet-VMOnClusterSharedVolumeListForCLX3PAR Pre-execution and post-execution programs Pre-execution return codes Post-execution return codesLogs Log facilityCLX cmdlet logs %HPCLX3PARPATH%\log\CLXCmdlet.log ProgramFiles%\Hewlett-Packard\Cluster Extension 3PAR\log\HP 3PAR Cluster Extension logs Error return codes HP 3PAR storage system log or sysmgr logRun showsys Start errors Log filesMsfc log file %windir\cluster\reports\cluster.log Failover error handling Cannot connect to HP 3PAR storage system Echo rescan diskpartPing storage system network name or IP address Nslookup storage system network nameChange of HP 3PAR storage system IP or password file Host persona settingsNofailwrtonerr settings Promote issue Cluster Extension Autopass troubleshootingHP 3PAR Target arrays not configured with Remote Copy Links Remote Copy and 3PAR Virtual DomainsHP 3PAR Target arrays not configured with Remote Copy Links Contacting HP New and changed information in this editionRelated information WhitepapersTypographic conventions Document conventionsGlossary Symbols IndexIndex Product manuals
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Cluster Software specifications

HP Cluster Software is a robust solution designed to enhance the reliability, availability, and scalability of computing environments in enterprise settings. This software is instrumental in managing clusters of servers, providing a unified framework that allows for efficient resource management, workload distribution, and high availability.

One of the main features of HP Cluster Software is its ability to deliver high availability through failover mechanisms. In the event of a hardware or software failure, the software automatically shifts workloads from the affected node to a standby node within the cluster, minimizing downtime. This feature is critical for organizations that require continuous access to their data and applications.

Scalability is another significant characteristic of HP Cluster Software. Organizations can easily add or remove nodes from the cluster without disrupting ongoing operations. This flexibility ensures that enterprises can adapt to changing workloads and resource demands efficiently, making it suitable for environments ranging from small businesses to large data centers.

Load balancing is a key technology employed by HP Cluster Software. It intelligently distributes workloads across the available nodes, optimizing resource utilization and ensuring that no single server is overwhelmed. By balancing the load, organizations can achieve better performance and enhance the response times of applications, which are essential for user satisfaction.

HP Cluster Software supports various clustering topologies, including active-active and active-passive configurations. This versatility allows organizations to choose the architecture that best fits their operational requirements. Additionally, the software integrates seamlessly with various HP and third-party hardware and software solutions, thus providing a holistic environment for managing IT resources.

Moreover, HP Cluster Software offers centralized management tools that simplify cluster administration. Administrators can monitor cluster performance, manage workloads, and configure settings all from a single interface. This ease of use reduces the complexity often associated with managing large clusters and empowers IT teams to respond rapidly to issues.

In summary, HP Cluster Software is an essential tool for organizations looking to enhance their IT infrastructure's availability, reliability, and performance. With its failover capabilities, scalability options, load balancing technology, and centralized management features, it stands out as a comprehensive solution for modern computing challenges.
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