vMotion Memory Overcommit Failure Thresholds

vMotion memory overcommit configuration and failure thresholds

0 reputation · 20 Mar 2021, 10:46 UTC

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Goal

Establish the precise memory overcommit thresholds that trigger a vMotion failure or VM suspension during live migration in vSphere.

Constraints and Uncertainty

vSphere allows vMotion to be initiated even when host memory overcommit exceeds 100%. While the vSphere Client may display a warning, the migration action remains enabled. There is no documented hard cap or percentage threshold that defines when the destination host will reject the migration due to insufficient free memory.

Technical Questions

What is the specific memory overcommit ratio that triggers a "Memory overcommit" error during vMotion?
Does the failure behavior differ between vSphere releases regarding how the system handles VM suspension during these events?

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vMotion memory overcommit configuration and failure thresholds

Goal

Constraints and Uncertainty

Technical Questions

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