[Engine-devel] SSH Soft Fencing

[Martin Perina]

Hi,

SSH Soft Fencing is a new feature for 3.3 and it tries to restart VDSM
using SSH connection on non responsive hosts prior to real fencing.
More info can be found at 

http://www.ovirt.org/Automatic_Fencing#Automatic_Fencing_in_oVirt_3.3

In current SSH Soft Fencing implementation the restart VDSM using SSH
command is part of standard fencing implementation in 
VdsNotRespondingTreatmentCommand. But this command is executed only
if a host has a valid PM configuration. If host doesn't have a valid
PM configuration, the execution of the command is disabled and host
state is change to Non Responsive.

So my question are:

1) Should SSH Soft Fencing be executed on hosts without valid PM
   configuration?

2) Should VDSM restart using SSH command be reimplemented
   as standalone command to be usable also in other parts of engine?
   If 1) is true, I think it will have to be done anyway.


Martin Perina