OLA/R Overview and Concepts

Planning and Preparation

could replace the card when the server is off-line, or if you must take action immediately, you can use rad to attempt an on-line addition of a backup card and deletion of the target card.

Failover Actions / Single Points of Failure

In most cases, the system will automatically fail over to the alternate resource when a card is suspended. However, some subsystems might require manual intervention. For example, the Logical Volume Manager (LVM), will automatically redirect I/O for a temporarily disconnected disk resource to a mirror, logging errors as it handles this situation.

Along those lines, if the resource will be suspended for an extended period of time, a large number of error log entries could result.

In this type of situation, you may want to manually switch over to a mirror beforehand. When you have completed the OLA/R procedure, the mirror and disk can be resynchronized.

If you suspend a card and the backup takes over, the system can contain a single point of failure. If the backup resource fails before the new card is on-line, the system could potentially crash. This window of vulnerability can be minimized by keeping the period of suspension as short as possible. This requires careful planning, and gathering as much information as possible before actually suspending driver operation and powering-down a card slot.

When an extended suspension period is unavoidable, or when the system is mission-critical, it is desirable to configure a second backup resource if possible.

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Chapter 4

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HP CommonIO Products manual Failover Actions / Single Points of Failure

CommonIO Products specifications

HP CommonIO products, designed to enhance connectivity and interoperability across various platforms, are a significant innovation in the realm of information technology. They serve as a foundational layer in HP's offerings, bridging the gap between hardware components, software applications, and the overarching IT infrastructure.

One of the most prominent features of HP CommonIO products is their robust compatibility with a wide range of devices. This versatility allows businesses to integrate different hardware systems effortlessly, facilitating seamless communication and data exchange. The products are built with an open architecture, ensuring that they can accommodate both legacy systems and the latest technological advancements.

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Security is a top priority in today’s digital landscape, and HP CommonIO products come with built-in security features. They support advanced encryption protocols and secure access controls, providing a secure framework for data transmission and safeguarding sensitive information. This level of security is essential for organizations that need to comply with stringent regulatory standards.

Additionally, HP CommonIO products are characterized by their user-friendly interfaces and management tools. Administrators can easily configure and monitor the systems, gaining insights into performance metrics and potential issues. This intuitive management simplifies operations and reduces the administrative overhead associated with IT maintenance.

The products also leverage cutting-edge technologies such as virtualization and cloud adaptations, allowing organizations to scale their resources according to demand. This flexibility is crucial for businesses aiming to optimize costs while meeting varying workloads effectively.

In summary, HP CommonIO products are designed to deliver enhanced connectivity, robust performance, and security, making them essential tools for modern IT environments. Their compatibility with diverse systems, high throughput capabilities, secure frameworks, and user-friendly management tools collectively contribute to their effectiveness in supporting organizations’ operational goals. As businesses continue to evolve, HP CommonIO products remain at the forefront, enabling efficient and secure IT infrastructures.