VM Migration Failed Due to Insufficient Memory

Problem

VM migration fails due to the insufficient memory on the source host. Ostackhost logs shows cannot allocate memory error like below:

Environment

• Platform9 Managed OpenStack - v4.0 and Higher

Cause

Source host do not have enough memory available to migrate the VM.

Resolution

It is always recommended to have enough resources on the host running production workloads. But, in this situation we need to either stop some low priority VMs or add up more resources on the host.