[Linux-HA] After testing a desaster, DRBD devices cant connect to each other

Alan Robertson alanr at unix.sh
Tue Jul 5 08:24:49 MDT 2005

Anquijix Schiptara wrote:
> Hi there
> Few days ago i tested a failure case. A short blackout of the master 
> (with breaking heartbeat connections for deadtime seconds). After 
> deadtime seconds, i plugged the connections in and looked, what happens.
> At first, both server are active, they recognize that and handle it 
> "ping-pong" like (2 changes of master), until the initial position was 
> reached again (master=master, slave=slave).
> But now i have the problem, that the DRBD-Devices arent connected anymore.
> On master i have the state Primary/Unknown, and on slave Secondary/Unknown.
> In man drbdsetup/drbdadm i couldnt find any suitable options to 
> reconnect to the mirror. So I have to stop heartbeat, that i can restart 
> DRBD. The consequence is, that i have a short breakdown of the hole 
> cluster, until i restarted the services. And i think, that shouldnt be 
> so in a HA environment.

If you're going to break all communication between the two sides and you 
want automatic recovery, then you'll need to configure a STONITH device.

     Alan Robertson <alanr at unix.sh>

"Openness is the foundation and preservative of friendship...  Let me 
claim from you at all times your undisguised opinions." - William 

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