🚀 High Availability (HA) vs Fault Tolerance (FT) in VMware

In virtualization, keeping workloads running is critical. VMware offers two key features to achieve this: HA (High Availability) and FT (Fault Tolerance) — but they serve different purposes.

🔹 VMware HA (High Availability)

• Automatically restarts VMs on another ESXi host if one fails.

• Requires vCenter + shared datastore.

• Downtime = a few minutes (while VMs restart).

• Best for general workloads where short downtime is acceptable.

🔹 VMware FT (Fault Tolerance)

• Provides continuous availability with zero downtime.

• Runs a live secondary VM in sync with the primary.

• No restart, no data loss, instant failover.

• Requires more resources and is ideal for mission-critical workloads.

👉 In short:

• HA = Restart Protection

• FT = Continuous Availability

Both are essential, but knowing when to use which can make the difference between acceptable downtime and uninterrupted service.

💡 Which one are you using more in your environment — HA for resilience or FT for critical apps?

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