HP Cluster Software manual Fully Automatic Failover and Failback, No server reboot

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Fully Automatic Failover and Failback

Automated failover and failback reduces the complexity involved in a disaster recovery situation. It is protection against the risk of downtime, whether planned or unplanned.

No server reboot

Disks on the server on both the primary and secondary sites are recognized during the initial system boot in a HP 3PAR Cluster Extension environment; therefore LUN presentation and LUN mapping changes are not necessary during failover or failback for a truly hand-free disaster tolerant solution.

No single point of failure

Supreme redundancy: identical configuration of established SAN infrastructure redundancies are implemented on remote site.

Synchronous mode support

HP 3PAR Remote Copy software offers synchronous data transfer mode between storage systems and host. Synchronous data transfers offer the highest levels of data protection. With synchronous operations, both the primary and secondary copies are identical and concurrent at all times.

Synchronous mirroring ensures that data copies are identical, to prevent critical data loss in the event of a failure or disaster. In this mode, data is written simultaneously to the mirrored cache of the primary storage system and the secondary storage system, in real time, before the application I/O is completed, thus ensuring the highest possible data consistency. Synchronous replication is appropriate when exact consistency is critical to the business application.

Storage system configurations

Cluster configurations typically consist of two or more server systems connected to a shared storage system. HP 3PAR Cluster Extension allows the dispersion of data center resources by enabling cluster systems to take advantage of HP 3PAR storage systems configured for Remote Copy operations. HP 3PAR Cluster Extension uses HP 3PAR InForm OS Command Line Interface (CLI) to control the HP 3PAR storage systems (and Remote Copy) with the cluster software, and uses cluster software to react to system hardware and application failures.

HP 3PAR Cluster Extension behavior is based on four major considerations:

•Cluster software failover behaviors

•HP 3PAR Cluster Extension user settings

•The replication mode setting for HP 3PAR Remote Copy, which is used to configure the remote replication feature of a 3PAR storage system environment based on your needs for application service availability, data concurrency, and replication performance

•Remote Copy volume group and virtual volume status information

HP 3PAR Cluster Extension supports the following configurations:

•1-to-1

•N-to-1 (the logical configuration must be a one-to-one configuration). See Figure 2 (page 9).

•1-to-N (the logical configuration must be a one-to-one configuration). See Figure 2 (page 9).

NOTE: Synchronous long distance and unidirectional remote copy configurations are not supported.

8HP 3PAR Cluster Extension features

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Contents HP 3PAR Cluster Extension Software Administrator Guide Acknowledgments Contents CLI commands and utilities Glossary Index TroubleshootingSupport and other resources Disaster tolerance through geographical dispersion Integration into cluster software Graphical user interfaceCLI for easy integration Automated redirection of mirrored disks Metropolitan distance supportNo server reboot Synchronous mode supportStorage system configurations Fully Automatic Failover and FailbackTo-1 configuration To-1 configurationHP 3PAR Remote Copy To-1 and 1-to-N configurationsProcesses and components 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 considerationsIntegrating HP 3PAR Cluster Extension with Msfc Configuring HP 3PAR Cluster ExtensionStarting the HP 3PAR Configuration Tool 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 Set-ClusterParameter -Name propertyname -Value valuetoset Setting HP 3PAR Cluster Extension properties using a UCFCluster resource clxfileshare /privprop Adding dependencies using Failover Cluster Management Adding dependencies on a HP 3PAR Cluster Extension resourceCluster resource Disk32b00b /adddependencyclxfileshare Adding dependencies using the CLIAdding dependencies using the PowerShell Four nodes host1DCA, host2DCA, host3DCB and host4DCB Configuration of HP 3PAR CLX for CSV disk on Windows ServerDisaster-tolerant configuration example using a file share Service or application example Managing HP 3PAR Cluster Extension resources Bringing a resource onlineDisk3PARLUN25 \cluster resource Clxfileshare /ProP RestartAction=0Deleting a resource Using Hyper-V Live Migration with HP 3PAR Cluster ExtensionTaking a resource offline Timing considerations for Windows Clustering Msfc Bouncing service or applicationCreating array password file Administration Hyper-V Live Migration log entries System resourcesLogs 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 optionTiming considerations Installing HP 3PAR InForm Command Line Interface CLICreating and configuring the user configuration file 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 Run showsys Error return codesHP 3PAR storage system log or sysmgr log Msfc log file %windir\cluster\reports\cluster.log Start errorsLog files Failover error handling Cannot connect to HP 3PAR storage system Echo rescan diskpartPing storage system network name or IP address Nslookup storage system network nameNofailwrtonerr settings Change of HP 3PAR storage system IP or password fileHost persona 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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