[ClusterLabs] SBD with shared device - loss of both interconnect and shared device?

[Roger Zhou]

On 10/9/19 3:28 PM, Andrei Borzenkov wrote:
> What happens if both interconnect and shared device is lost by node? I
> assume node will reboot, correct?
> 

 From my understanding from Pacemaker integration feature in `man sbd`

Yes, sbd will do self-fence upon lose access to sbd disk when the node 
is not in quorate state.

> Now assuming (two node cluster) second node still can access shared
> device it will fence (via SBD) and continue takeover, right?

Yes, 2-node cluster is special. The node lose access to disk will 
self-fence even it is in "quorate" state.

> 
> If both nodes lost shared device, both nodes will reboot and if access
> to shared device is not restored, then cluster services will simply
> not come up on both nodes, so it means total outage. Correct?

Yes, without functioning SBD, the pacemaker won't start at the systemd 
level.

Cheers,
Roger


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