Differences between vMotion, DRS, Fault Tolerance (FT), and High Availability (HA)

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FeaturePurposeHow It WorksUse Case
vMotionLive migration of VMsMoves running VMs between ESXi hosts with zero downtimeMaintenance without disruption, load balancing
DRS (Distributed Resource Scheduler)Automated load balancingUses vMotion to migrate VMs across hosts based on CPU/memory loadOptimizing performance and resource allocation
Fault Tolerance (FT)Continuous availabilityCreates a secondary VM that mirrors the primary VM in real-timePreventing downtime for critical applications
High Availability (HA)Automatic VM restart on failureDetects host failures and restarts VMs on other available hostsRecovery from host crashes

Key Differences:

  • vMotion is a manual or automated live migration tool.
  • DRS automates VM placement and load balancing using vMotion.
  • Fault Tolerance (FT) provides continuous availability without data loss.
  • High Availability (HA) ensures VMs restart on another host after a failure.
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