[Engine-devel] SSH Soft Fencing

[Eli Mesika]

----- Original Message -----
> From: "Martin Perina" <mperina at redhat.com>
> To: engine-devel at ovirt.org
> Cc: "Yair Zaslavsky" <yzaslavs at redhat.com>, "Barak Azulay" <bazulay at redhat.com>, "Eli Mesika" <emesika at redhat.com>
> Sent: Thursday, June 27, 2013 1:51:06 PM
> Subject: SSH Soft Fencing
> 
> 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?

I think that the answer should be yes. The vdsm restart will solve most of problems , so why not using it whether a PM agent is defined or not.

> 
> 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.

+1 

> 
> 
> Martin Perina
>