What happens when an ESP data center goes down?

Data center failures happen. Well-architected ESPs handle them gracefully through redundancy and failover systems.

Immediate response:

• Monitoring detects the outage (automated health checks, alerts)
• Load balancers stop routing new traffic to the failed location
• Incoming messages redirect to healthy data centers

Message preservation:

• Queued messages in the failed location remain on persistent storage
• Once connectivity restores, queued messages resume processing
• Redundant queue systems may have copies in other locations

Continued operation:

• Other data centers absorb the additional load
• Sending continues, possibly with increased latency or reduced throughput
• New messages process normally from healthy locations

Recovery:

• Engineers diagnose and repair the issue
• Once verified healthy, the data center rejoins the network
• Traffic gradually rebalances to normal distribution
• Any stuck queues drain

• Customer impact:
• Well-prepared ESPs: minimal to no visible impact; slightly increased latency possible
• Poorly prepared ESPs: sending delays, potential message loss, dashboard outages

Multi-region redundancy separates good infrastructure from risky setups. Ask your ESP about their disaster recovery capabilities.