[DRBD-user] primary/primary with OCFS2 for the first time, questions

Martin Gombac martin at isg.si
Thu Mar 27 09:30:05 CET 2008

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

Hi again,

it's been 7 days and i haven't recieved any reply. Is my question  
stupid, too obvious or what?


On 2008.3.21, at 13:11, Martin Gombac wrote:
> Hi DRBD users,
> i've been using drbd since 0.6 version. I always used to setup fail- 
> over clusters with primary/secondary and usually 2 drbd resources.  
> Each running on one node as primary.
> Now i'm thinking it's time to try primary/primary for the first  
> time. I would use OCFS2 and gentoo.
> I wonder how does OCFS2 or DRBD 8.0.* deal with failed failed  
> replication link when the same file is accessed.
> I mean, in the primary/secondary if the replication link went down  
> on secondary no data was written. If for some strange reason the  
> secondary resource became primary and mounted if we got split  
> brain, solution was pretty straight forward. Data got  
> (automatically or manually) replicated back from first primary node  
> or the node with most current data on resource basis. r1 could be  
> replicated one way, while r0 was in the other way.
> But what happens when i have only one resource in primary/primary  
> and the same file gets written to or created on both with different  
> content while resource is disconnected?
> I cannot say sync from first to second node since each node has  
> some of the data correct and doing this in either way would make me  
> loose half of the data. I'm I not understanding something here or  
> is this expected? Maybe point me to some manual which explains drbd  
> in primary/primary mode. I don't think i can find this info on:  
> http://www.drbd.org/users-guide/index.html
> Regards,
> M.
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