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Hi Alvise,

I encountered this a while ago. Here's a relevant Bugzilla entry:

https://bugzilla.redhat.com/show_bug.cgi?id=1057645

Best Wishes,
Adam

On Wed, Jun 18, 2014 at 7:51 PM, Alvise Dorigo <alvise.dorigo at pd.infn.it> wrote:
> 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
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