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Levels of Redundancies

  • Level 0: no redundancy
  • Level 1: support manual failure detection & rerouting or recovery within a single site; expectations to complete in 30 minutes
  • Level 2: support automated failure detection & rerouting 
    • within a single geographic site
    • stateless components: establish baseline measure of failed requests for a component failure within a site 
    • stateful components: establish baseline of data loss for a component failure within a site
  • Level 3: support automated failover detection & rerouting 
    • across multiple sites 
    • stateless components 
      • improve on # of failed requests for component failure within a site 
      • establish baseline for failed requests for site failure 
    • stateful components 
      • improve on data loss metrics for component failure within a site 
      • establish baseline for data loss for site failure

Level 3 redundancy → Geo-Redundancy

Geo-redundancy types

active / standby 

cold standby

warm standby

hot standby

active / active