[CentOS-virt] Fencing question(s)

Thu Jun 21 17:01:14 UTC 2012
Steve Campbell <campbell at cnpapers.com>

I've got a Centos 5.8 box that I use for testing Xen VMs. I'm trying to 
setup some Centos 6.2 hosts in a high availability situation. I've tried 
the pacemaker route and couldn't get the connection established, so 
thought I'd try the RH-preferred methods. Mind you, all of these VMs are 
on the same host.

Using Conga, it seems that I need some sort of fencing device, which 
doesn't really work in a VM environment. I'm guessing it's the same with 
command line configuration.

Firstly, is it really possible to set up two VMs on the same machine to 
do HA? I can't see why not, but I'm not the best source of knowledge on 
any of this.

Secondly, is there a useable fencing device that would work in a virtual 
environment for me to test with? I'd really like to avoid fencing 
altogether, even once in production, but every thing I read suggests 
against that.

Any type of reply would be appreciated.

steve campbell