The Two Kinds of Failovers

Active/Active

• Pros
  • Global Load Balancing (GLB) supported
  • Automated fail over
    • Less down time
  • Automated or manual roll back to primary in most cases
• Cons
  • (Generally) More expensive then active/passive fail over
  • Setup is more complex
• Notes
  • If we are going to pay for a colocation site why not utilize it?
  • Real time data replication

Active/Passive

• Pros
  • Cheaper
  • Simpler
• Cons
  • Manual Failover
    • Longer downtime than an automated process (could be just minutes)
    • This would require someone to flip the switch, which could be tricky in the event of a disaster.
  • No GLB with this option
  • The co-location site is not being utilized except in a DR situation.
• Notes
  • Daily/weekly data replication.

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