Continuing to write changes despite a broken link leads to a loss of synchronization between primary and secondary Remote Copy volume groups. The no_fail_wrt_on_err policy is used when you would rather keep the applications that are writing the data running, even when the Remote Copy has failed and become out of sync. After the error that caused the broken link is resolved, you must manually restart the Remote Copy operation between the members of the Remote Copy pair to bring the Remote Copy in sync again.

NOTE: HP 3PAR Cluster Extension supports only the Remote Copy volume groups with

no_fail_wrt_on_err policy. For information on setting the Remote Copy volume group policies, see the Remote Copy Commands section in HP 3PAR Remote Copy User’s Guide .

Remote Copy and 3PAR Virtual Domains

Remote Copy checks HP 3PAR Virtual Domains (domains) on the remote system to ensure that the virtual volume is mirrored to the same domain name as the local domain name. The domain needs to be called a correct domain name. For more information on domains, see the HP 3PAR Concepts Guide and for instructions on setting up domains, see the HP 3PAR CLI Administrator’s Manual.

NOTE: When configuring the HP 3PAR storage system password file for Cluster Extension usage, user in the password file should have access to all the domains of Remote Copy virtual volumes managed by Cluster Extension.

Promote issue

When the data copy is going on between the primary and the secondary Remote Copy volume groups, if the Remote Copy link is broken for some reason, the Remote Copy volume groups go to the stopped state and the snapshots of the secondary volumes start getting promoted to the base volumes. This is the design of 3PAR Remote Copy. This activity may take some time to complete. At this time, if the start or restore operation is attempted on the Remote Copy volume groups, then this operation may fail with the error Promote operation is going on. At this time, if the local replication role is secondary, the remote replication role is primary, and the remote copy link is up, Cluster Extension executes stop, reverse, and start operations for the Remote Copy volume group. If the stop and reverse operation succeed, then the secondary volumes become read-write and Cluster Extension resource comes online even though the start operation may fail. If the start operation fails, replication I/O does not start from the new primary volumes to the new secondary volumes.

Cluster Extension Autopass troubleshooting

Cluster Extension uses Autopass as a framework for licensing checks. Autopass provides Graphical User Interface and a Command Line Interface to perform licensing specific operations, and they are well integrated into the Cluster Extension. For the GUI, Autopass needs a compatible JRE version installed on the system. For the supported JRE version see the Cluster Extension SPOCK. In case the GUI is not working due to environmental issues related to JRE, CLI can be used to perform the licensing specific operations like install and uninstall.

HP 3PAR Target arrays not configured with Remote Copy Links

Sometimes CLX Configuration Tool is not able to add an array even through the password file exists and PATH variable is set properly for the HP 3PAR Inform CLI, you can still execute HP 3PAR Inform CLI command locally. The root cause for this problem is that the HP 3PAR Inform CLI command showrcopy for this array does not show any target information (in case if target array is not configured). Hence, configure the 3PAR remote copy for the array first, and then add the array to CLX configuration through CLX configuration tool.

Configuration of CLX resource for CSV disk on Windows Server 2012 : When user wants to configure the resource properties for a CLX resource using the Failover Cluster Manager, the HP

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HP Cluster Software manual Remote Copy and 3PAR Virtual Domains, Promote issue, Cluster Extension Autopass troubleshooting
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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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