[Linux-cluster] question about number of fencing devices needed for a two node cluster

[Alvaro Jose Fernandez]

Thanks for the tip, Jakov. 
regards,

alvaro
> ¿any experiences over this issue?

It's because you still have SPOF. In this case, SPOF is the electronic
module of the powerswitch, so, if the electronics go down, there's no
way to fence the node. It would be better to have for example iDRAC or
IPMI as primary fencing device and APC as secondary.

But, as in many things in IT, you are back to price/performance ratio.
If you really must achieve 5x9 uptime, or else you have money penalty,
then you'll invest in secondary fencing device. For most clusters, one
fencing device is enough, though.


-- 
Jakov Sosic

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