[ClusterLabs] how important would you consider to have two independent fencing device for each node ?

Lentes, Bernd bernd.lentes at helmholtz-muenchen.de
Tue Apr 18 11:07:15 EDT 2017


i'm currently establishing a two node cluster. Each node is a HP server with an ILO card.
I can fence both of them, it's working fine.
But what is if the ILO does not work correctly ? Then fencing is not possible.

I also have a switched PDU from APC. Each server has two power supplies. Currently one is connected to the normal power equipment, the other to the UPS.
As a sort of redundancy, if the UPS does not work properly.

When i'd like to use the switched PDU as a fencing device i will loose the redundancy of two independent power sources, because then i have to connect both power supplies together to the UPS.
I wouldn't like to do that.

How important would you consider to have two independent fencing device for each node ? I'd can't by another PDU, currently we are very poor.

Is there another way to create a second fencing device, independent from the ILO card ?



Bernd Lentes 

institute of developmental genetics 
Gebäude 35.34 - Raum 208 
HelmholtzZentrum München 
bernd.lentes at helmholtz-muenchen.de 
phone: +49 (0)89 3187 1241 
fax: +49 (0)89 3187 2294 

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