Overview
Planned or unplanned, infrastructure and application downtime can come at any time, from any direction, and in any form. The ability to keep an organization operational during a technology outage, facility destruction, loss of personnel, or loss of critical third party services is critical to preventing irreversible damage to a business.
With the increasing global shift to e-commerce models and their reliance on 24/7 application uptime, high availability (HA) and disaster recovery (DR) impact the financial health of organizations.
High Availability Versus Disaster Recovery
While they both increase overall availability, the notable difference is that with HA there is generally no loss of service. HA retains the service and DR retains the data, but with DR, there is usually a slight loss of service while the DR plan executes and the system restores.
High availability (HA) – The measure of a system’s ability to remain accessible in the event of a system component failure. Generally, HA is implemented by building in multiple levels of fault tolerance and/or load balancing capabilities into a system.
Disaster recovery (DR) – The process by which a system is restored to a previous acceptable state, after a natural (flooding, tornadoes, earthquakes, fires, etc.) or man-made (power failures, server failures, misconfigurations, etc.) disaster.
High Availability Options
You can achieve high availability through the use of clustering and/or load balancing of the nodes. Depending on the defined SLA, four HA options are possible with Mule:
- Cold Standby
- Warm Standby
- Hot Standby – Active-Passive
- Active-Active
Conclusion
The performance information of all managed devices can be managed
and displayed. Both real-time and historical performance and load information can be accessed and evaluated using easy to understand
graphics.
By setting threshold values all critical performance parameters can be
monitored, triggering local or remote alarms in case of exceeding. Critical components then can be identified with a few clicks helping to
take immediate action