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

[Alvaro Jose Fernandez]

Hi,

 

I would like to know about wheter it would suffice for a two-node RHCS cluster a single power switch (APC 7921) fencing device. The power switch has 8 power outlets and I intend to use four of them for each node's dual power supplies. 

 

I know it would be desirable to have two devices for a fully redundant configuration, but after reading some examples from the docs (they are meant for two power switch), I still cannot understand why a single power switch connected to both servers and the switch taking power from the UPS, would not be a good configuration. There is a single UPS in the environment.

 

¿any experiences over this issue? 

 

regards,

 

alvaro

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/linux-cluster/attachments/20101206/e864b484/attachment.htm>