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HA101.md

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HA 101

What is HA?

  • Minimization of system Downtime
  • Minimization of data/transaction loss
  • In cae of multiple failures,Minimization of data loss is preferred over minimization of System downtime.

Implementing HA

  • Elimination of SPOF
    • Redundancy of network components

Stateless Vs Stateful

  • Stateless

    • There is no dependency between requests
    • No need for data replication/sync

  • Statefull

    • An action typically compises multiple requests
    • Data needs to be replicated and synchronized between redundant services

HA and Scalability:

  • Active/Passive:

    • There is a single master
    • A stateful service a replcaement resources can be brought online. A seprate application monitors there services,

  • Active/Active

    • Multiple masters -scales out

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