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Hi,
I've 3 compute nodes with a shared Gluster filesystem mounted on /var/lib/nova/instances on all 3 nodes. 
After I start a VM I see the usual files in the shared file system:

    [root at compute ~]# ll /var/lib/nova/instances/
    total 7
    drwxr-xr-x 2 nova nova   75 Jun 12 09:40 4f4ed899-a485-401e-aae7-8029068a6be8
    drwxr-xr-x 2 nova nova  106 Jun 12 09:40 _base
    drwxr-xr-x 2 nova nova 4102 Jun 12 09:40 locks
    [root at compute ~]# ll /var/lib/nova/instances/4f4ed899-a485-401e-aae7-8029068a6be8/
    total 4180
    -rw-rw---- 1 nova kvm    17219 Jun 12 09:40 console.log
    -rw-r--r-- 1 qemu kvm  4259840 Jun 12 09:41 disk
    -rw-r--r-- 1 nova nova      79 Jun 12 09:40 disk.info
    -rw-r--r-- 1 nova nova    1697 Jun 12 09:40 libvirt.xml

with correct ownerships.

Then, I try a live-migration, which apparently goes well:

    [root at controller-01 ~]# nova list
    +--------------------------------------+------+--------+------------+-------------+----------------+
    | ID                                   | Name | Status | Task State | Power State | Networks       |
    +--------------------------------------+------+--------+------------+-------------+----------------+
    | 4f4ed899-a485-401e-aae7-8029068a6be8 | test | ACTIVE | -          | Running     | admin=10.0.1.4 |
    +--------------------------------------+------+--------+------------+-------------+----------------+
    [root at controller-01 ~]# nova show test|grep host
    | OS-EXT-SRV-ATTR:host                 | compute.cloud.pd.infn.it                                 |
    | OS-EXT-SRV-ATTR:hypervisor_hostname  | compute.cloud.pd.infn.it                                 |
    | hostId                               | aacf08e590c7dbfebc1c211dd94fb29ea89b002b2422fdcdb7564d59 |

    [root at controller-01 ~]# nova live-migration test compute-02.cloud.pd.infn.it
    […]

    [root at controller-01 ~]# nova show test|grep host
    | OS-EXT-SRV-ATTR:host                 | compute-02.cloud.pd.infn.it                              |
    | OS-EXT-SRV-ATTR:hypervisor_hostname  | compute-02.cloud.pd.infn.it                              |
    | hostId                               | ae17651af3bd9379b458b1756e08799c22a83c564255297ce2454843 |

But, after migration the ownership of some files has changed:

    [root at compute ~]# ll /var/lib/nova/instances/4f4ed899-a485-401e-aae7-8029068a6be8/
    total 4165
    -rw-rw---- 1 root root    2221 Jun 12 10:03 console.log
    -rw-r--r-- 1 root root 4259840 Jun 12 09:41 disk
    -rw-r--r-- 1 nova nova      79 Jun 12 09:40 disk.info
    -rw-r--r-- 1 nova nova    1697 Jun 12 10:03 libvirt.xml

and the VM is now in read-only mode.

Could you please help me in debugging and fixing this ?

thanks,

   Alvise