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Check if you have any space in the instances dir in the filesystem. I've seen this happen when the drive gets full and libvirt gets an io error trying to write to disk so it shuts off the vms.

Vish

On Dec 5, 2012, at 6:59 PM, pyw <pengyuwei at gmail.com> wrote:

> My virtual machine created, often in the absence of intervention into the stopped state: 
> 
> pyw at ven-1:~/devstack$ virsh list --all
>  Id Name                 State
> ----------------------------------
>   - instance-00000040    shut off
>   - instance-00000044    shut off
>   - instance-00000045    shut off
>   - instance-00000046    shut off
>   - instance-00000047    shut off
>   - instance-0000005b    shut off
>   - instance-0000005e    shut off
>   - instance-00000065    shut off
>   - instance-0000006e    shut off
>   - instance-00000075    shut off
>   - instance-00000076    shut off
>   - instance-00000077    shut off
>   - instance-0000007c    shut off
>   - instance-0000007d    shut off
>   - instance-00000081    shut off
>   - instance-00000082    shut off
>   - instance-00000083    shut off
>   - instance-00000084    shut off
>   - instance-00000085    shut off
> 
> query the nova the database, you can see:
> vm_state: stopped
> Why is this?
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