[DRBD-user] DRBD primar/primary

James Wilson jwilson at transolutions.net
Thu Aug 9 14:40:04 CEST 2007

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

Thanks for the reply. I haven't had this happen on its own. I was just 
testing by pulling the network cable to see if everything would failover 
and noticed it when the other server came back up. Also to manually 
resync them I just issue the command drbdadm invalidate "r0" or whatever 
your resource is. Is this the wrong way to do it?

Lars Ellenberg wrote:
> On Thu, Aug 09, 2007 at 09:39:51AM +0200, Pierguido wrote:
>> James Wilson wrote:
>>> Hey All,
>>>   I am running DRBD 8.0.3 in primary/primary mode. I tested my cluster 
>>> this morning by pulling the plug on one of the DRBD servers everything 
>>> worked out fine but when the server comes back up it doesn't resync and 
>>> is in secondary state for some devices and unknown for others. How can I 
>>> have the devices sync up and then become primary/primary again? Thanks 
>>> for any advice.
>> I have the same problem...i tried some things but nothing worked out.
>> Is there a sequence of command to do in these cases?
>> Thanks
> you could configure some "auto-recovery strategies", see after-sb-#pri
> settings in drbd.conf.
> to get them reconnected and resynchronized manually,
> you'd have to typically
>  chose one side to do
>    umount
>    drbdadm -- --discard-my-data connect XY
>  and maybe on the other side do normal
>    drbdadm connect XY
> we are going to make this less annoying than it is now by introducing a
> write_quorum and IO-freeze on disconnect, then we can timeout for a
> possible imminent reconnect (network hiccup only), and after that
> timeout arbitrate (triggered by the cluster manager) which side may
> continue, and which has to be fenced (or let it self-fence...).
> but for the time being, yes, I know, two-primaries is still "inconvenient"
> when you have a flaky network.

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