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High-availability clusters (also known as HA clusters, fail-over clusters) are groups of computers that support server applications that can be reliably utilized with a minimum amount of down-time. They operate by using high availability software to harness redundant computers in groups or clusters that provide continued service when system ...
Systems designers usually provide failover capability in servers, systems or networks requiring near-continuous availability and a high degree of reliability. At the server level, failover automation usually uses a " heartbeat " system that connects two servers, either through using a separate cable (for example, RS-232 serial ports/cable) or a ...
Veritas Cluster Server (rebranded as Veritas Infoscale Availability [1] [2] and also known as VCS and also sold bundled in the SFHA product) is high-availability cluster software for Unix, Linux and Microsoft Windows computer systems, created by Veritas Technologies.
High availability software is measured by its performance when a subsystem fails, its ability to resume service in a state close to the state of the system at the time of the original failure, and its ability to perform other service-affecting tasks (such as software upgrade or configuration changes) in a manner that eliminates or minimizes ...
High availability (HA) is a characteristic of a system that aims to ensure an agreed level of operational performance, usually uptime, for a higher than normal period. [ 1 ] There is now more dependence on these systems as a result of modernization.
In information technology, high-availability application architecture is a process followed when implementing a new application into an existing business-wide computer system or ERP while minimizing downtime. ff The architecture contains three stages: development, quality assurance, and production.
In database computing, Oracle Real Application Clusters (RAC) — an option [1] for the Oracle Database software produced by Oracle Corporation and introduced in 2001 with Oracle9i — provides software for clustering and high availability in Oracle database environments.
The Oracle Database Appliance (ODA) is a database server appliance made by Oracle Corporation. It was introduced in September 2011 as the mid-market offering in Oracle's family of full-stack, integrated systems the company calls engineered systems. [1] The ODA is a single rack-mounted device providing a highly-available two-node clustered ...