Open Stack

After completing the Openstack setup and launching an instance, I've
used Cirros as test image, when I go to Instances-->Console, I see a
blank screen. Sometimes , I saw it was stopping at "GRUB Loading
1.5.".

nova-compute.log is below: I seems it does not have a error.

    2014-07-26 12:49:19.471 1647 AUDIT nova.compute.manager
[req-67850e25-eb27-4c81-b55f-9cde32762861
d58bd07ab69b462d93bc8c60dc541d4c 03b3921e022e49ce8642d4a382554810]
[instance: ca444eb0-ade1-4bc1-bea1-1cb5a3af0504] Starting instance...
2014-07-26 12:49:19.619 1647 AUDIT nova.compute.claims
[req-67850e25-eb27-4c81-b55f-9cde32762861
d58bd07ab69b462d93bc8c60dc541d4c 03b3921e022e49ce8642d4a382554810]
[instance: ca444eb0-ade1-4bc1-bea1-1cb5a3af0504] Attempting claim:
memory 512 MB, disk 1 GB, VCPUs 1 2014-07-26 12:49:19.620 1647 AUDIT
nova.compute.claims [req-67850e25-eb27-4c81-b55f-9cde32762861
d58bd07ab69b462d93bc8c60dc541d4c 03b3921e022e49ce8642d4a382554810]
[instance: ca444eb0-ade1-4bc1-bea1-1cb5a3af0504] Total memory: 3953
MB, used: 512.00 MB 2014-07-26 12:49:19.621 1647 AUDIT
nova.compute.claims [req-67850e25-eb27-4c81-b55f-9cde32762861
d58bd07ab69b462d93bc8c60dc541d4c 03b3921e022e49ce8642d4a382554810]
[instance: ca444eb0-ade1-4bc1-bea1-1cb5a3af0504] memory limit: 5929.50
MB, free:
    5417.50 MB 2014-07-26 12:49:19.621 1647 AUDIT nova.compute.claims
[req-67850e25-eb27-4c81-b55f-9cde32762861
d58bd07ab69b462d93bc8c60dc541d4c 03b3921e022e49ce8642d4a382554810]
[instance: ca444eb0-ade1-4bc1-bea1-1cb5a3af0504] Total disk: 39 GB,
used: 0.00 GB 2014-07-26 12:49:19.622 1647 AUDIT nova.compute.claims
[req-67850e25-eb27-4c81-b55f-9cde32762861
d58bd07ab69b462d93bc8c60dc541d4c 03b3921e022e49ce8642d4a382554810]
[instance: ca444eb0-ade1-4bc1-bea1-1cb5a3af0504] disk limit not
specified, defaulting to unlimited 2014-07-26 12:49:19.622 1647 AUDIT
nova.compute.claims [req-67850e25-eb27-4c81-b55f-9cde32762861
d58bd07ab69b462d93bc8c60dc541d4c 03b3921e022e49ce8642d4a382554810]
[instance: ca444eb0-ade1-4bc1-bea1-1cb5a3af0504] Total CPUs: 2 VCPUs,
used: 0.00 VCPUs 2014-07-26 12:49:19.623 1647 AUDIT
nova.compute.claims [req-67850e25-eb27-4c81-b55f-9cde32762861
d58bd07ab69b462d93bc8c60dc541d4c 03b3921e022e49ce8642d4a382554810]
[instance: ca444eb0-ade1-4bc1-bea1-1cb5a3af0504] CPUs limit not
specified, defaulting to unlimited 2014-07-26 12:49:19.624 1647 AUDIT
nova.compute.claims [req-67850e25-eb27-4c81-b55f-9cde32762861
d58bd07ab69b462d93bc8c60dc541d4c 03b3921e022e49ce8642d4a382554810]
[instance: ca444eb0-ade1-4bc1-bea1-1cb5a3af0504] Claim successful
2014-07-26 12:49:20.685 1647 INFO nova.virt.libvirt.driver
[req-67850e25-eb27-4c81-b55f-9cde32762861
d58bd07ab69b462d93bc8c60dc541d4c 03b3921e022e49ce8642d4a382554810]
[instance: ca444eb0-ade1-4bc1-bea1-1cb5a3af0504] Creating image
2014-07-26 12:49:27.068 1647 INFO nova.virt.libvirt.driver [-]
[instance: ca444eb0-ade1-4bc1-bea1-1cb5a3af0504] Instance spawned
successfully. 2014-07-26 12:50:03.342 1647 AUDIT
nova.compute.resource_tracker [-] Auditing locally available compute
resources

When I look at a  nova console , it was output "VFS: Can't find ext4
filesystem".I could not understand means of this messages.

Also , I tried other images ( ubuntu or CentOS 6.5 ) , but it was not
able to bring up.
After a little the instance status changed to "Paused from "Running".

I built in 3 nodes (compute , controller , network).
All ubuntu server 14.04.
These environment is nested KVM on ESXi , I guessit works fine.

    root at compute:~# lsmod |grep kvm
    kvm_intel             143060  0
    kvm                   451511  1 kvm_intel
    root at compute:~# egrep -c '(vmx|svm)' /proc/cpuinfo
    2
    root at compute:~# cat /etc/nova/nova-compute.conf
    [DEFAULT]
    compute_driver=libvirt.LibvirtDriver
    [libvirt]
    virt_type=kvm

I am refferring to blow:
http://docs.openstack.org/trunk/install-guide/install/apt/content/launch-instance-neutron.html

Do you know what causes this?
Could you please advise to me?

Thank you.

Takeshi