[one-users] VM running on multiple hosts

[Miloš Kozák]

Hi,

it is great to know, is it related to the improved monitoring in ONE? I 
am getting ready for trials of ONE 4.6.

We are using shared_lvm driver, so I would like to know if the new LVM 
driver is compatible with it? Or I can expect some major issues? I 
havent had enough time to check..

Thanks Milos


Dne 14-06-27 12:18 PM, Tino Vazquez napsal(a):
> Hi,
>
> Issues with delete and shutdown have been greatly improved in
> OpenNebula 4.4+, I would recommend upgrading as far as possible.
>
> Best,
>
> -Tino
>
> --
> OpenNebula - Flexible Enterprise Cloud Made Simple
>
> --
> Constantino Vázquez Blanco, PhD, MSc
> Senior Infrastructure Architect at C12G Labs
> www.c12g.com | @C12G | es.linkedin.com/in/tinova
>
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> On 26 June 2014 16:42, Steven Timm <timm at fnal.gov> wrote:
>> We have also seen this behavior in OpenNebula 3.2.
>> It appears that the failure mode occurs because the onevm delete
>> (or shutdown or migrate) doesn't correctly verify that the virtual machine
>> has gone away.
>> It sends the acpi terminate signal to the virtual machine
>> but if that fails, the VM will keep running.  There is no
>> signal sent to libvirt to kill the machine regardless.
>> OpenNebula
>> deletes the disk.0 from underneath it but that doesn't stop
>> the vm from running, it stays running on the deleted file handle.
>>
>> On the plus side, I once was able to recover the full disk image
>> of a VM that shouldn't have been deleted, that way, by going
>> to the /proc file system and dd'ing from the still-open file
>> handle of the process.
>>
>> We've written a set of utilities to check the consistency
>> of the leases database with what is actually running on the cloud,
>> and alert us if there are any differences.
>>
>> Steve Timm
>>
>>
>>
>> On Thu, 26 Jun 2014, Milos Kozak wrote:
>>
>>> Hi, I would like to add that I have experienced it few times with ONE
>>> 3.8..
>>>
>>> On 6/26/2014 9:34 AM, Robert Tanase wrote:
>>>>       Hi all,
>>>>
>>>>       We are using Opennebula 4.2 system with several hosts ( KVM +
>>>>       network storage) .
>>>>
>>>>       Recently we have discovered, by having disk r/w issues on a VM, that
>>>>       after a delete - recreate action, specific VM is running on two
>>>>       different hosts: the old placement host and the new placement host.
>>>>
>>>>       We are using the hooks system for host failure and a cron job at 5
>>>>       minutes which is (re)deploying pending machines on available running
>>>>       hosts.
>>>>
>>>>       By checking oned log files we couldn't find any abnormal behavior
>>>>       and we are stuck.
>>>>
>>>>       Please guide us to find the root cause of this issue if is possible.
>>>>
>>>>       --
>>>>       Thank you,
>>>>       Robert Tanase
>>>>
>>>>
>>>>
>>>>   _______________________________________________
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>>>>
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>>>
>>>
>> ------------------------------------------------------------------
>> Steven C. Timm, Ph.D  (630) 840-8525
>> timm at fnal.gov  http://home.fnal.gov/~timm/
>> Fermilab Scientific Computing Division, Scientific Computing Services Quad.
>> Grid and Cloud Services Dept., Associate Dept. Head for Cloud Computing
>>
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