Re: [Xen-users] DRBD, Xen, HVM and live migration

[Joseph Glanville <joseph.glanville@xxxxxxxxxxxxxx>]

Hi.

Yes Corosync and Pacemaker are perfect for the task. USB STONITH
devices are cheap and effective.
Goodluck with your configuration. :)

Joseph.

On 13 May 2011 04:40, Bart Coninckx <bart.coninckx@xxxxxxxxxx> wrote:
> Hi Jospeh,
>
> that's indeed what I figured. The Pacemaker cluster software should take
> care of avoiding split brains. I will need to convince certain people of
> investing into a STONITH device.
>
>
> B.
>
>
> On 05/11/11 06:09, Joseph Glanville wrote:
>>
>> Hi,
>>
>> Using the DRBD VBD backend over simply using PHY has one main advantage.
>>
>> If you are using drbd: you don't need to have the system contstantly
>> in dual-primary mode, which can cause data corruption and increases
>> the chances of a split brain event occuring in a network segregation
>> senario.
>> If you are fine using allow-dual-primary and become-primary-on: both
>> then it no longer makes any difference.
>>
>> Joseph.
>>
>> On 11 May 2011 01:05, Bart Coninckx<bart.coninckx@xxxxxxxxxx>  wrote:
>>>
>>> Hi,
>>>
>>> I want to combine all the above mentioned technologies.
>>>
>>> The Linbit pages warn not to use the drbd: VBD with HVM DomUs.
>>>
>>> This page however:
>>>
>>>
>>> http://publications.jbfavre.org/virtualisation/cluster-xen-corosync-pacemaker-drbd-ocfs2.en
>>>
>>> (thank you Jean), simply puts two DRBD devices in dual primary mode and
>>> starts Xen DomUs while pointing to the DRBD devices with phy: in the DomU
>>> config files.
>>> Live migration and HVM seem possible.
>>>
>>> Is it as simple as Jean describes it? What is the advantage then of the
>>> drbd: VBD? Just seeing to it that the dual primary is available?
>>>
>>>
>>> Thx!
>>>
>>>
>>> B.
>>>
>>> _______________________________________________
>>> Xen-users mailing list
>>> Xen-users@xxxxxxxxxxxxxxxxxxx
>>> http://lists.xensource.com/xen-users
>>>
>>
>>
>>
>



-- 
Kind regards,
Joseph.
Founder | Director
Orion Virtualisation Solutions | www.orionvm.com.au | Phone: 1300 56
99 52 | Mobile: 0428 754 846

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