Fence device location

[jfilho]

In the RHLS material, you can see things like this:

pcs stonith status
* fence_nodea (stonith:fence_ipmilan): Started nodea.private.example.com
* fence_nodeb (stonith:fence_ipmilan): Started nodeb.private.example.com
* fence_nodec (stonith:fence_ipmilan): Started nodec.private.example.com

If the stonith device for nodea ( for example ) is running on nodea, wouldn't that fail to fence nodea when nodea is down? Shouldn't I make sure that fence_device would start on a different server ?

[NirZilka]

Fencing devices are on infrastructure level. for example:

Virtualization hypervisor (rhvm/ovirt/vmware/openstack ..)

Cloud vendors (aws/azure ..)

iLO/idrac

DC's remote power management systems and others.

It depents where your server located, and your fence resource will contact the underlying infrastructure to do the vm/physical reboot.

On rh/ex436 there is a vm that provides the power management for your environment (the ips on your fencing resources are interfaces in this power management separate vm).

Regards,

Nir.

[Wasim_Raja]

@NirZilka Thanks for sharing this.

[Chetan_Tiwary_]

Thanks @NirZilka ! 

[Chetan_Tiwary_]

You can refer to Chapter pr01s02 - Orientation to classroom environment for more details on the same :