Cannot migrate VM due to "libvirtError: cannot fork child process: Cannot allocate memory" error

Solution Verified - Updated -

Issue

Trying to migrate a VM, migration fails. On source Host, vdsm log shows the error:

libvirtError: cannot fork child process: Cannot allocate memory

Environment

  • Red Hat Enterprise Virtualization 3.1.
  • Red hat Enterprise Linux 6.3 as Hypervisor.

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