[DRBD-user] DRBD 4 node active-active?

Kim Ebert kim.ebert at perfectsearchcorp.com
Thu Jan 5 17:53:51 CET 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Lars,

Thanks for the info. It makes sense that you can have an Active - Active 
on the top layer, but not on the bottom two layers. It wasn't 
immediately obvious in the documentation.

Currently, I'm just investigating into what DRBD can do, so I don't have 
a particular implementation in mind yet.

Thanks,

Kim

On 01/05/2012 05:50 AM, Lars Ellenberg wrote:
> On Wed, Jan 04, 2012 at 04:17:27PM -0700, Kim Ebert wrote:
>> Is it possible to have an active active configuration using stacked
>> resources?
>>
>> This wasn't clear to me in the documentation.
>>
>> Something like,
>>
>> Node A  Active \
>> Node B             / R0
>> Node C  Active \
>> Node D            / R1
>>
>> R0 Active \
>> R1 Active / R2
>>
>> Access stacked resource at R2.
> Works, but, as always, with dual primary,
> you have to get the fencing and stonith right!
>
>               [pri]<---->  [pri]
>                 |            |
>                 v            v
> [sec]<----- [pri]        [pri] ----->  [sec]
>
> Depending on your requirements,
> the latency behaviour will look bad, though.
>
>
> Does not work:
>
>               [pri]<---->  [pri]
>                 |            |
>                 v            v
> [pri]<---->  [pri]        [pri]<---->  [pri]
>
>
> As changes originating on the leaves
> can not travel to the other end.
>
>
> What would you like to do?
>




More information about the drbd-user mailing list