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

SlingPirate sling.temp at googlemail.com
Thu Sep 15 11:57:21 CEST 2011

Note: "permalinks" may not be as permanent as we would like,
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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/
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> drbd-user at lists.linbit.com
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> 
> 

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