[Engine-devel] Watchdog support Feature

[Laszlo Hornyak]

----- Original Message -----
> From: "Doron Fediuck" <dfediuck at redhat.com>
> To: "Laszlo Hornyak" <lhornyak at redhat.com>
> Cc: "engine-devel" <engine-devel at ovirt.org>
> Sent: Monday, February 11, 2013 5:43:20 PM
> Subject: Re: [Engine-devel] Watchdog support Feature
> 
> 
> ----- Original Message -----
> > From: "Laszlo Hornyak" <lhornyak at redhat.com>
> > To: "Doron Fediuck" <dfediuck at redhat.com>
> > Cc: "engine-devel" <engine-devel at ovirt.org>
> > Sent: Monday, February 11, 2013 9:56:42 AM
> > Subject: Re: [Engine-devel] Watchdog support Feature
> > 
> > Hi Doron,
> > 
> > If the watchdog is set to action="reset" and you break the kernel,
> > the VM will stay in UP state while waiting for the watchdog to
> > reset
> > the VM, and will still be in UP state while rebooting. So in theory
> > engine will not be notified about a crash.
> > This behavior is different when the action="poweroff" because the
> > watchdog will really put the VM in a Down state and it is engine's
> > job to restart it if HA as soon as it receives the notification
> > from
> > VDSM.
> > 
> Thanks. Just note that poweroff requires guest co-operation
> which we loose when kernel crashes. That's why it's not recommended.

That's the shutdown. http://libvirt.org/formatdomain.html#elementsWatchdog
I always confuse the two :) Fortunately we will only have one.

> 
> > 
> > ----- Original Message -----
> > > From: "Doron Fediuck" <dfediuck at redhat.com>
> > > To: "Laszlo Hornyak" <lhornyak at redhat.com>
> > > Cc: "engine-devel" <engine-devel at ovirt.org>
> > > Sent: Sunday, February 10, 2013 4:40:29 PM
> > > Subject: Re: [Engine-devel] Watchdog support Feature
> > > 
> > > Hi Laszlo,
> > > Looks very useful. Any thoughts on what engine will do while
> > > if the VM is defined as HA while the watchdog is resetting it?
> > > 
> > > 
> > > ----- Original Message -----
> > > > From: "Laszlo Hornyak" <lhornyak at redhat.com>
> > > > To: "engine-devel" <engine-devel at ovirt.org>
> > > > Sent: Wednesday, February 6, 2013 11:25:03 AM
> > > > Subject: Re: [Engine-devel] Watchdog support Feature
> > > > 
> > > > Hi everyone,
> > > > 
> > > > I hope everyone is satisfied with the spec, please read it
> > > > through
> > > > for the last time and I will move it to implementation phase
> > > > soon.
> > > > 
> > > > Thx,
> > > > Laszlo
> > > > 
> > > > ----- Original Message -----
> > > > > From: "Laszlo Hornyak" <lhornyak at redhat.com>
> > > > > To: "engine-devel" <engine-devel at ovirt.org>
> > > > > Sent: Thursday, January 24, 2013 3:19:57 PM
> > > > > Subject: Watchdog support Feature
> > > > > 
> > > > > Hi,
> > > > > 
> > > > > Watchdog support in engine will add watchdog to the ovirt UI
> > > > > and
> > > > > REST
> > > > > API. Watchdog cards will be mainly used in HA vm's.
> > > > > 
> > > > > http://www.ovirt.org/Features/Watchdog_engine_support
> > > > > 
> > > > > Your feedback is welcome!
> > > > > 
> > > > > Thank you,
> > > > > Laszlo
> > > > _______________________________________________
> > > > Engine-devel mailing list
> > > > Engine-devel at ovirt.org
> > > > http://lists.ovirt.org/mailman/listinfo/engine-devel
> > > > 
> > > 
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>