[DRBD-user] Enabling a stacked resource - HELP!

SlingPirate sling.temp at googlemail.com
Thu Sep 15 14:28:00 CEST 2011


For anyone using google and stuck like I was, you can use the same net card
just need diferent ports assigned to each resource.


SlingPirate wrote:
> 
> Thanks for your reply Matthieu, I'm now trying it as seperate DRBD's for
> each of the VMs as live migration would be nice but it's not a necessity.
> 
> Only now I seem to be running into a problem of not being able to use the
> same network card for multiple DRBD resources. I'm hoping that I won't
> have to use a different IP's for each resource!
> 
> 
> 
> 
> Matthieu Labbé wrote:
>> 
>> Hello,
>> 
>> 2011/9/13 SlingPirate <sling.temp at googlemail.com>:
>>>
>>> Thank you for your input Lars, and apologies for my lack of
>>> understanding.  I
>>> have done some more reading and I am still somewhat unsure as how to
>>> approch
>>> this. I will try to re-explain what I'm after and I would be grateful
>>> for
>>> any more of your time and guidance.
>>>
>>> ********* On-site *********                    *** Off-site ***
>>> = NODE-1 =        = NODE-2 =                      = NODE-DR =
>>> =   VM-1   =        =   VM-1   =                      =   VM-1     =
>>> =   VM-2   =        =   VM-2   =                      =   VM-2     =
>>> =   VM-3   =        =   VM-3   =                      =   VM-3     =
>>> =   VM-4   =        =   VM-4   =                      =   VM-4     =
>>>
>>> Under normal conditions I would like to run VM-1 & VM-2 on NODE-1 while
>>> VM-3
>>> & VM-4 run on NODE-2.
>>>
>>> If NODE-1 dies NODE-2 runs all the VMs or visa-versa. If the site that
>>> NODE-1 & NODE-2 are based at blows up, NODE-3 is ready to run all VMs.
>>>
>>> I can use either block devices or image files for the VMs.
>>>
>>> What would you suggest would be the correct way to set this up?
>>>
>> 
>> You need more than one DRBD, for example:
>> DRBD0 for VM-1 & VM-2, Primary on NODE-1, Secondary on NODE-2
>> DRBD1 for VM-3 & VM-4, Primary on NODE-2, Secondary on NODE-1
>> or use one DRBD per VM as suggested before.
>> 
>> You only need dual primary if you want to do live migration between
>> NODE-1 and NODE-2 and in that case the classic 3-way setup doesn't
>> work.
>> If you don't need live migration, do classic 3-way setups.
>> 
>> Hope that help,
>> Matt.
>> 
>> --
>> Matthieu Labbé
>> http://mattlabbe.com/
>> _______________________________________________
>> drbd-user mailing list
>> drbd-user at lists.linbit.com
>> http://lists.linbit.com/mailman/listinfo/drbd-user
>> 
>> 
> 
> 

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