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Re: [Linux-cluster] fencing device



Jakub Suchy wrote:
Hi,

|fencing can be a SPOF, you need two fencing devices).

ILO is used on many sites successfully.

It is. Just just have to be careful when using it.

|- It's not a shared device. It MUST be on the same network path as
|  heartbeat.
Not true...  I have my ILO on my public network and my heartbeat on a private network switch.  No problems with fencing in this configuration.

Talking about two node clusters: Try disconnecting your private network.
Each node tries to fence each other, iLO is not shared and is on public
network, therefore it may succeed. If it accidentally happens in the
same time (and it can), all nodes will fence each other and you end up
with powered off servers. This is what you don't want to happen...

QDisk can solve this problem.

    http://sourceware.org/cluster/wiki/FAQ/CMAN#two_node_correct

John


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