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How to configure a shared file system in Openstack Compute?

I am trying to implement NFS (shared /var/lib/nova/instances directory) in openstack compute so that when the host fails, we can still move the instance to other nodes. I am following the guide from: http://docs.openstack.org/admin-guide-cloud/compute-configuring-migrations.html. I tried to follow the steps in the mentioned link, and then landed up into issue that now I am unable to launch the instances. I rechecked everything and found that, there is a mismatch of UID/GID between my controller and the compute nodes (I am using two compute nodes). I tried manually to match them by following the guide mentioned in https://docs.hpcloud.com/commercial/GA1/1.1commercial.disaster-recovery.html, but still no help. I am trying to build a production level Openstack environment, but need to implement shared file system on the compute. Kindly provide a actually tested way to implement shared file system on the compute.