Resource disk failure when HP 3PAR Cluster Extension is online

In a cluster resource group, if the Cluster Extension resource is online but dependent disk resource is failing:

Ensure that the fibre channel connectivity between the servers and the storage systems is up and running.

Verify that the disk resource is dependent to the Cluster Extension resource.

Ensure that the Remote Copy volume group managed by the Cluster Extension resource contains the virtual volume which is correctly mapped to the configured disk resource.

On a cluster node where the Cluster Extension resource is online, ensure that the presented virtual volume is having read/write access on the HP 3PAR storage system.

Using HP 3PAR Management GUI, verify that the virtual volume is having read/write access on HP 3PAR storage system where Cluster Extension resource is online.

Rescan disks using Disk Management.

Cluster Extension and HP 3PAR Command Line (CLI) Install/Upgrade

While installing or upgrading HP 3PAR Command Line Interface (CLI), the environment variable Path will be updated with the CLI install directory. Occasionally, this change does not take effect and you may have to re-login to Windows. HP recommends that you test the CLI commands after you install or upgrade HP 3PAR CLI and try to re-login, if the commands fail due to the binary not found error.

Change of HP 3PAR storage system IP or password file

If there is change in the configured HP 3PAR storage system's IP address in the Cluster Extension configuration or if the configured password file is missing or corrupt, Cluster Extension will fail to communicate with the storage system and cannot perform any Cluster Extension failover operations. You can use the Connection Test option of HP 3PAR Cluster Extension configuration tool to verify connectivity of configured storage systems. To change HP 3PAR storage systems settings, use the Modify option in the HP 3PAR Cluster Extension configuration tool and save the configuration file on all cluster nodes.

Host persona settings

Host personas are a set of behaviors that permit hosts connected to FC ports on the HP 3PAR storage system to deviate from the default host behavior. By assigning a persona to a host, multiple host types that require distinct customized responses can share a HP 3PAR storage system port. For example, hosts running Windows operating systems can all connect to the same HP 3PAR storage system port.

You can set the host persona number when the host is created or modify it later. To display, create, modify, and remove host personas, use the HP 3PAR CLI commands or the HP 3PAR Management Console. For instructions on displaying, creating, modifying, and removing host personas, see the HP 3PAR InForm CLI Administrator’s Manual or the HP 3PAR InForm Management Console Online Help.

NOTE: Host persona setting varies based on the Windows operating system installed on the cluster nodes. For more information, see the HP 3PAR Implementation Guide.

no_fail_wrt_on_err settings

The no_fail_wrt_on_err policy applies only to synchronous Remote Copy.

The no_fail_wrt_on_err group policy (default policy) allows writes to a primary Remote Copy volume group even though the link between the systems in the Remote Copy pair is broken.

Resource disk failure when HP 3PAR Cluster Extension is online 75

Page 75
Image 75
HP Cluster Software Change of HP 3PAR storage system IP or password file, Host persona settings, Nofailwrtonerr settings

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.