[Engine-devel] watchdog

Fri Apr 12 12:45:31 UTC 2013

Laszlo Hornyak píše v Pá 12. 04. 2013 v 08:07 -0400:
> 
> ----- Original Message -----
> > From: "Michal Skrivanek" <mskrivan at redhat.com>
> > To: "Yair Zaslavsky" <yzaslavs at redhat.com>
> > Cc: "engine-devel" <engine-devel at ovirt.org>
> > Sent: Thursday, April 11, 2013 5:29:53 PM
> > Subject: Re: [Engine-devel] watchdog
> > 
> > 
> > 
> > On 11 Apr 2013, at 12:26, Yair Zaslavsky <yzaslavs at redhat.com> wrote:
> > 
> > > 
> > > 
> > > ----- Original Message -----
> > >> From: "Tomas Jelinek" <tjelinek at redhat.com>
> > >> To: "Laszlo Hornyak" <lhornyak at redhat.com>
> > >> Cc: "engine-devel" <engine-devel at ovirt.org>
> > >> Sent: Thursday, April 11, 2013 11:33:19 AM
> > >> Subject: Re: [Engine-devel] watchdog
> > >> 
> > >> Good that you have come up with this! So we will make sure to keep this
> > >> info.
> > >> Thnx for coming up with it!
> > >> 
> > >> ----- Original Message -----
> > >>> From: "Laszlo Hornyak" <lhornyak at redhat.com>
> > >>> To: "Tomas Jelinek" <tjelinek at redhat.com>
> > >>> Cc: "engine-devel" <engine-devel at ovirt.org>
> > >>> Sent: Thursday, April 11, 2013 10:25:28 AM
> > >>> Subject: Re: [Engine-devel] watchdog
> > >>> 
> > >>> 
> > >>> 
> > >>> ----- Original Message -----
> > >>>> From: "Tomas Jelinek" <tjelinek at redhat.com>
> > >>>> To: "Laszlo Hornyak" <lhornyak at redhat.com>
> > >>>> Cc: "engine-devel" <engine-devel at ovirt.org>
> > >>>> Sent: Thursday, April 11, 2013 10:02:16 AM
> > >>>> Subject: Re: [Engine-devel] watchdog
> > >>>> 
> > >>>> 
> > >>>> 
> > >>>> ----- Original Message -----
> > >>>>> From: "Laszlo Hornyak" <lhornyak at redhat.com>
> > >>>>> To: "Itamar Heim" <iheim at redhat.com>
> > >>>>> Cc: "engine-devel" <engine-devel at ovirt.org>
> > >>>>> Sent: Thursday, April 11, 2013 9:56:32 AM
> > >>>>> Subject: Re: [Engine-devel] watchdog
> > >>>>> 
> > >>>>> Hi,
> > >>>>> 
> > >>>>> Isnt someone already working on removing the UI distinction between
> > >>>>> server
> > >>>>> and desktop?
> > >>>> Indeed :)
> > >>>> 
> > >>>>> 
> > >>>>> However the desktop/server distinction could be useful for scheduling
> > >>>>> information, I hope that will remain.
> > >>>> There will be a combo box: "optimized for server/desktop". That one
> > >>>> will set up the dialog like you would open the new server/desktop today.
> > >>>> But you will be able to change them - it will be just some sugar. But
> > >>>> there
> > >>>> is no reason
> > >>>> why would we enforce the disabling the e.g. soundcard for server. By
> > >>>> default
> > >>>> we will, but
> > >>>> you can enable it if you want.
> > >>> 
> > >>> Ok, so in engine we will still have the VmType in vmStatic?
> > >>> 
> > >>> I think it would make sense to use it in scheduling / load balancing
> > >>> - if a VM is a desktop and no user is connected to the console, then the
> > >>> VM
> > >>> is not in use, therefore it is a good candidate for saving power
> > >>> (hibernate,
> > >>> migrate, shutdown, or any other bad things that can happen to a VM)
> > >>> - if a VM is a server, usually no user connected, but it may still be
> > >>> used
> > >>> through its network. Therefore it may not be a good candidate to migrate.
> > > 
> > > is this indeed a valid assumption ("if VM is a server..." ) that a user
> > > will less connect to it?
> > IMHO if we want some new behavior/policy there should be a new corresponding
> > property,  not desktop/server. That can be quite misleading and I would
> > rather see it go away. Other than use it as a set of default values
> 
> Sure, let's call it something else, but this is a typical behavior expected from the desktop/server property. 

Well there could be property with different default values for desktop and servers, couldn't it? ;) Think about memory overcommit or default disk allocation for example.

David

> So what we are going to do is that remove the property and throw away all the related data, while when (if ever) we get the new property (behaveAsDesktop, notUsedWhenNotConnected, whatever we call it) the users of the system will set this property for the VM's that used to be desktops. We could save that work for the users.
> 
> Also, it may appear to be an edge-case, but for a good scheduling in my opinion this is important.
> 
> > 
> > > 
> > > 
> > >>> 
> > >>>> 
> > >>>>> 
> > >>>>> ----- Original Message -----
> > >>>>>> From: "Itamar Heim" <iheim at redhat.com>
> > >>>>>> To: "Laszlo Hornyak" <lhornyak at redhat.com>
> > >>>>>> Cc: "engine-devel" <engine-devel at ovirt.org>, "Andrew Cathrow"
> > >>>>>> <acathrow at redhat.com>
> > >>>>>> Sent: Wednesday, April 10, 2013 9:38:15 PM
> > >>>>>> Subject: Re: [Engine-devel] watchdog
> > >>>>>> 
> > >>>>>> On 04/10/2013 04:59 PM, Laszlo Hornyak wrote:
> > >>>>>>> Hi,
> > >>>>>>> 
> > >>>>>>> A new version of the watchdög feature is available in gerrit:
> > >>>>>>> 
> > >>>>>>> http://gerrit.ovirt.org/13057 - db
> > >>>>>>> http://gerrit.ovirt.org/13058 - bll
> > >>>>>>> http://gerrit.ovirt.org/13059 - frontend
> > >>>>>>> http://gerrit.ovirt.org/13060 - rest
> > >>>>>>> 
> > >>>>>>> http://www.ovirt.org/Features/Watchdog_engine_support
> > >>>>>>> 
> > >>>>>>> Since the last update the patchset has gone through major changes
> > >>>>>>> to
> > >>>>>>> meet
> > >>>>>>> the new architectureal and functional requirements.
> > >>>>>>> Also because of the rewrite this is again a preview version under
> > >>>>>>> testing
> > >>>>>>> with some missing functionality, therefore I re-introduced the
> > >>>>>>> [wip]
> > >>>>>>> flag
> > >>>>>>> on it.
> > >>>>>>> 
> > >>>>>>> Thx,
> > >>>>>>> Laszlo
> > >>>>>>> _______________________________________________
> > >>>>>>> Engine-devel mailing list
> > >>>>>>> Engine-devel at ovirt.org
> > >>>>>>> http://lists.ovirt.org/mailman/listinfo/engine-devel
> > >>>>>> 
> > >>>>>> just a thought after looking at the feature page having different HA
> > >>>>>> dialog for server/desktop - I'd consider removing the distinction
> > >>>>>> between desktop and server in the GUI wrt HA (i.e., just both have
> > >>>>>> same
> > >>>>>> set of options)
> > >>>>>> 
> > >>>>>> (not blocking for this patch)
> > >>>>> _______________________________________________
> > >>>>> Engine-devel mailing list
> > >>>>> Engine-devel at ovirt.org
> > >>>>> http://lists.ovirt.org/mailman/listinfo/engine-devel
> > >> _______________________________________________
> > >> Engine-devel mailing list
> > >> Engine-devel at ovirt.org
> > >> http://lists.ovirt.org/mailman/listinfo/engine-devel
> > > _______________________________________________
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> > 
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-- 

David Jaša, RHCE

SPICE QE based in Brno
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