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HA & Disaster Recovery

To protect your business and ensure that your users have ready access to your servers, you must plan strategies for both high availability and recovery from a hardware failure or natural disaster that could disable your installation. To determine and implement high availability and disaster recovery solutions, you must first define your business objectives, then purchase and deploy the hardware that is required to achieve those objectives. High availability (HA) is the measurement 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

High Availability systems seek to minimize two things:

  • System downtime —: occurs when a user-facing service is unavailable beyond a specified maximum amount of time, and
  • Data loss -: accidental deletion or destruction of data.

  • A crucial aspect of high availability is the elimination of single points of failure (SPOFs). A SPOF is an individual piece of equipment or software which will cause system downtime or data loss if it fails. In order to eliminate SPOFs, following mechanisms should be exist for redundancy of :

  • Network components, such as switches and routers
  • Applications and automatic service migration
  • Storage components
  • Facility services such as power, air conditioning, and fire protection