High availability (HA) solutions provide continuous availability for critical applications running in physical or virtual environments, protecting them from hardware and application failures. These solutions use clustering technology to detect faults and automatically recover applications, improving availability and enabling organizations to maintain business continuity. HA solutions also provide scalability and load balancing to support growing workloads, while enabling fault tolerance to protect against disruptions. By implementing an HA solution, organizations can improve application availability, reduce downtime, and enhance overall system performance, ensuring that their mission-critical applications are always available and running optimally. 

• HPE Serviceguard is a high availability (HA) and disaster recovery (DR) clustering solution that increases uptime for your critical applications by protecting them from an application fault across physical or virtual environments over any distance.

• IBM PowerHA is IBM's solution for high-availability clusters on the AIX Unix, IBM i, and Linux. IBM PowerHA provides end-to-end integrated clustering solutions for high availability (HA) and disaster recovery (DR) with one integrated configuration with a simplified user interface.

• Oracle Real Application Clusters (RAC) is a solution for distributing databases across multiple nodes. It allows customers to run a single Oracle Database across multiple servers. Oracle RAC enables organizations to improve availability and scalability by enabling fault tolerance and load balancing while increasing performance.

• Veritas InfoScale is a software-defined infrastructure solution that provides high availability and disaster recovery. InfoScale Availability uses intelligent monitoring to detect risks to availability and automatically recovers applications when needed. It also detects site outages and initiates application recovery at a disaster recovery site.