What is high availability (HA)? What is ha?

Highly available ha (high availability) refers to improving system and application availability by minimizing downtime due to day-to-day maintenance operations (schedules) and burst system crashes (unplanned). It is different from the fault tolerant technique which is considered to be uninterrupted operation. The HA system is the most effective way for enterprises to prevent the core computer systems from being shut down.

Features of high availability (HA)

1, software fault monitoring and elimination

2. Backup and Data protection

3, the management station can monitor the operation of each site, can report the operation of the system at any time or regularly, failure can timely report and alarm, and have the necessary control means

4. Implement error isolation and service switching between primary and backup servers

Ha's working mode: Ha has master-slave mode and duplex method of two modes

What is the difference between high availability and fault-tolerant technology?

Fault-tolerant (FT) technology typically uses redundant hardware to cross-detect operational results. When an exception is found, the faulty part is isolated without affecting the user's actions.

High-availability scenarios take advantage of fewer redundant components and software to detect failures, isolate damaged parts immediately if a failure occurs, and maximize the availability of systems and applications by providing recovery.

Fault-tolerant technology is increasingly being transferred to software as the processor speeds up and prices fall. Future fault-tolerant technology will be completely completed in the software environment, and the difference between it and high-availability technologies disappears.