[Linux-cluster] fencing problem in 2 node cluster using apc fence device

[Lon Hohberger]

On Wed, 2006-08-16 at 22:37 +0800, Gary Lua wrote:
> Hi,
> 
> I'm currently configuring fencing devices for my 2 nodes on a RHEL4 
> cluster. The problem is quite long, so please bear with me.
> 
> I have 2 nodes (let's call them stone1 and stone2) and 2 APC fencing 
> devices (pdu1 and pdu2, both apc 7952 devices). Both stone1 and stone2 
> has dual power supplies. Stone1's power supplies are connected to outlet 
> 13 of pdu1 and pdu2. Stone2's power supplies are connected to outlet 20 
> of both the pdus. My question is: during the fencing configuration for 
> each node, i need to specify which fence device to add to the fence 
> level of each node. Is it correct to specify for stone1 as follows : 
> pdu1 -> port=13, switch=1, pdu2-> port=13, switch=2? The same applies to 
> stone 2 : pdu1-> port=20, switch=1, pdu2-> port=20, switch=2?
> 
> After configuring as mentioned above, with both nodes on the cluster 
> running and my application running on stone1, i pull out the ethernet 
> cables for stone1 to simulate that the server is down. By right, my 
> application should fail over to stone2 and fencing should occur to 
> stone1 (ie, stone1 should be rebooted/shutdown). However, what happened 
> is that my application is started on stone2, and stone1 is not fenced. 
> In fact, when i reconnect by cables, my application is still running on 
> stone1! Seems that there are 2 instances of my application running, each 
> on stone1 and stone2.

Post the cluster configuration.

-- Lon