[Users] request for WOL

[Andrew Cathrow]

----- Original Message -----
> From: "Nicholas Kesick" <cybertimber2000 at hotmail.com>
> To: "oVirt Mailing List" <users at ovirt.org>
> Sent: Tuesday, May 1, 2012 5:29:42 PM
> Subject: Re: [Users] request for WOL
> 
> 
> 
> > Date: Tue, 1 May 2012 17:20:24 -0400
> > From: acathrow at redhat.com
> > To: virtuallymad at gmail.com
> > CC: users at ovirt.org
> > Subject: Re: [Users] request for WOL
> > 
> > 
> > 
> > ----- Original Message -----
> > > From: "Gary Scarborough" <virtuallymad at gmail.com>
> > > To: users at ovirt.org
> > > Sent: Tuesday, May 1, 2012 3:58:41 PM
> > > Subject: [Users] request for WOL
> > > 
> > > 
> > > I would like to request Wake on LAN support be added to the Power
> > > Management interface. It seems like a good fall back for anyone
> > > who
> > > doesn't have proper power management capabilities.
> > 
> > Fencing needs to reboot a node, WOL would only wake it up if it was
> > suspended.
> > 
> > 
> > > 
> > > --
> > > Gary Scarborough
> > > IST Lab Manager
> > > Rochester Institute of Technology
> > > Rochester NY
> > > 
> But it could issue the reboot command via SSH no?

No. Fencing is used when the node is not responsive, if we could ssh into it then it's unlikely we'd be fencing it.
When a node isn't responsive we need a mechanism to reset it but also confirm that it's been "dealt with", so using IPMI (which is in nearly all servers today, even whitebox), iLO, DRAC, IMM, etc allows us to connect to the management controller reboot it and confirm that it's been reset.

Other approaches we can take involve extending our use of sanlock.


> I was also interested in WOL and curious as to why it wasn't in there
> already. WOL allows the system to go into standby for power
> management (less desirable than Off, but standby could return to

actually more desirable than off in many cases - for example in the cluster policy we could put a node into powersaving mode and more quickly resurrect it when required.
That's been on "the list" for a long time - just needs patches .....

> service faster). For poweroff, the shutdown command could be passed
> via SSH, but the system would have to prompt that manual booting
> would be required. Unless the system supports boot on WOL request.
> 
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