[Linux-cluster] Fencing Device Question

Johannes Russek johannes.russek at io-consulting.net
Wed Jun 4 12:15:42 UTC 2008

> My question is what (if anything) can RHCS/GFS do to determine the 
> health/presence/operation of fencing devices?  If it can do something 
> to monitor the fencing devices, and discovers a bad fencing device, 
> what will it do?  For example, if I unplug the network cable for the 
> heartbeat, the node will get fenced immediately.  I never tested 
> whether the same would happen if I unplugged a fencing device.  I 
> haven't delved into the documentation in a while, but I don't remember 
> anything about a way to have redundant fencing devices, like a DRAC 
> and a network power switch.  Is there a way?

You should be able to add as many fencing devices as you like, cman 
should go through them top to bottom, if it won't get a positive 
response from the fencing script.
in my case i have IPMI, then network power switch, then fabric fencing.

> Thoughts, opinions, insight, documentation, etc would be greatly 
> appreciated.
> --
> Brandon

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