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VCPU over commit issue

Unable to over commit vcpu usage on Ocata version.Installed Openstack Ocata version with 6 hypervisor which consists of 72 vcpu.Default cpu over commit ratio is 16:1 and therefore i should get 72*16 vcpu,but unfortunately when vcpu usage goes beyond 76 ,multiple IP's getting assigned to newly created instance and not properly booting up. Is there any configuration change required to use over commit vcpu feature.

VCPU over commit issue

Unable to over commit vcpu usage on Ocata version.Installed Openstack Ocata version with 6 hypervisor which consists of 72 vcpu.Default cpu over commit ratio is 16:1 and therefore i should get 72*16 vcpu,but unfortunately when vcpu usage goes beyond 76 ,multiple IP's getting assigned to newly created instance and not properly booting up. Is up.Is there any configuration change required to use over commit vcpu feature.