[DRBD-user] Primary/Primary : how put a node in outdate mode ?

Dominique Fournier dominique.fournier at grenoble.cnrs.fr
Mon Feb 4 12:08:41 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.


Lars Ellenberg wrote:
> On Wed, Jan 30, 2008 at 12:28:01PM +0100, Dominique Fournier wrote:
>> Hello,
>>
>> I use a drbd 8.2.4-1, on a Debian 2.6.23-1-amd64 machine. The cluster 
>> should be in primary/primary mode with OCFS2 to support services on both 
>> nodes.
>>
>> It work really well under normal work.
>>
>> When the drbd link drops, I would like :
>> - The first node continue to work as Primary (with Waiting For Connection)
>> - The second node go to Outdate mode.
>>
>> When the link should goes up, the Secondary do a sync diff and after I 
>> can put it primary again, and restart OCFS and my services.
>>
>> I wrote a drbd-peer-outdater which know on which node it is launched.
>>
>> My problem is :
>> How can I put the second node in Outdate state immediately without 
>> passing it in Secondary mode ?
> 
> you can't.
> 
>> I can't pass it in Secondary because OCFS is mounted and dead services 
>> are connected to partition. I can't kill services nor OCFS because drbd 
>> is idle.
> 
> and DRBD can't do anything about that.
> 
> the OCFS2 way of dealing with this sort of problems is "SMITH",
> which translates to "shoot myself in the head" (compare with "STONITH").
> you could try to do a user space handler for these events,
> which resets the box (instead of or in addition to the outdate).
> 
> 
Thanks for your response.

I dont't find any docs on this on OCFS2 but I will ask to their 
mailling-list.

Thanks again !

Dom
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