[ovirt-users] difference between thin/depentend and clone/dependent vm virtual machine
Dafna Ron
dron at redhat.com
Wed Apr 23 09:21:56 EDT 2014
what do you mean that host1 is engine + vdsm, are you using hosted engine?
On 04/23/2014 01:59 PM, Tamer Lima wrote:
>
> hello,
> thanks for reply
>
> my storage is NFS v3, defined on host 01. My DATA-DOMAIN and
> ISO-DOMAIN are hosted on host 01;
> my SPM is located on host 03, I dont remember why. I tried to migrate
> SPM to host 01 but is not possible. All creation of virtual machine
> starts on server 01 (
>
>
>
>
>
>
> On Wed, Apr 23, 2014 at 5:19 AM, Dafna Ron <dron at redhat.com
> <mailto:dron at redhat.com>> wrote:
>
> I think that you are mixing up a lot of different things and to be
> honest I am not sure what configuration you have and what exactly
> you are trying to do.
> so lets try to simplify it?
> what type of storage are you working on?
> which host is the spm?
>
>
>
> On 04/22/2014 07:36 PM, Tamer Lima wrote:
>
> hello,
>
> I am in trouble
>
> I have 3 servers dedicated to test OVIRT:
> 01- engine + vdsm (8 cpus, 32GB ram , 2TB HD)
> 02 - vdsm (8 cpus, 32GB ram , 2TB HD)
> 03 - vdsm (8 cpus, 32GB ram , 2TB HD)
>
> I want to create cloned virtual machines but in my
> configuration I can only save virtual machines on server 01;
> my configuration refers a DATA DOMAIN on server 01
>
> All my virtual machines are : 2 cpu , 6 GB ram , 500gb HD and
> were created like CLONE
>
> My server 01 is the data domain and all new virtual machine is
> created, via NFS, on server 01 , who has 2TB maximum capacity
> ( the same size of partition /sda3 = 2TB)
>
> how can I save each virtual machine on a desired vdsm server ?
>
> What I want is :
> server 01 - engine + vdsm : 03 virtual machines running and
> hosted phisicaly on this host
> server 02 - vdsm : 04 virtual machines running and hosted
> phisicaly on this host
> server 03 - vdsm : 04 virtual machines running and hosted
> phisicaly on this host
>
> but I have this :
> server 01 - engine + vdsm : 03 virtual machines running and
> hosted phisicaly on this host
> server 02 - vdsm : 01 virtual machines running on this server
> BUT hosted phisicaly on server 01
> server 03 - vdsm : none, because my DATA DOMAIN IS FULL (2TB )
>
> How to solve this problem ?
> is it possible create one DATA DOMAIN for each VDSM host ? I
> think this is the solution but I do not know how to point VMs
> to be saved on specific data domain.
>
> thanks
>
>
>
>
> On Fri, Apr 18, 2014 at 4:48 AM, Michal Skrivanek
> <michal.skrivanek at redhat.com
> <mailto:michal.skrivanek at redhat.com>
> <mailto:michal.skrivanek at redhat.com
> <mailto:michal.skrivanek at redhat.com>>> wrote:
>
>
> On Apr 17, 2014, at 16:43 , Tamer Lima
> <tamer.americo at gmail.com <mailto:tamer.americo at gmail.com>
> <mailto:tamer.americo at gmail.com
> <mailto:tamer.americo at gmail.com>>> wrote:
>
> > hi, thanks for reply
> >
> > I am investigating what is and how "thin virtualization"
> works
> >
> > Do you know if HADOOP is indicated to work under "thin"
> environment ?
> > On Hadoop I will put large workloads and this thin
> virtualization utilizes more resources than exists (shareable
> environment)
> > that is,
> > if I have a real physical necessity of 500gb for each hadoop
> host and my Thin Virtualization has 2TB on NFS, I can have
> only 4
> virtual machines (500GB each), or less.
> >
> > For this case I believe clone virtual machine is the right
> choice. But in my environment it takes 1h30m to build one
> cloned
> virtual machine.
>
> if you plan to overcommit then go with thin. The drawback
> is that
> if you of course hit the physical limit the VMs will run
> out of
> space...
> if you plan to allocate 500GB each, consume all of it,
> never plan
> to grow then go with the "clone"….yes, it's going to take
> time to
> write all that stuff. With "thin" you need to do the same
> amount
> of writes, but gradually over time while you're allocating
> it it
>
> hope it helps
>
> Thanks,
> michal
>
> >
> >
> >
> > Am I correct ?
> >
> >
> >
> >
> >
> > On Thu, Apr 17, 2014 at 7:33 AM, Michal Skrivanek
> <michal.skrivanek at redhat.com
> <mailto:michal.skrivanek at redhat.com>
> <mailto:michal.skrivanek at redhat.com
> <mailto:michal.skrivanek at redhat.com>>>
>
> wrote:
> >
> > On Apr 16, 2014, at 16:41 , Tamer Lima
> <tamer.americo at gmail.com <mailto:tamer.americo at gmail.com>
> <mailto:tamer.americo at gmail.com
> <mailto:tamer.americo at gmail.com>>> wrote:
> >
> > >
> > >
> > > Hello,
> > >
> > > I created VMs by two ways :
> > >
> > > 1) on tab virtual machines > new vm > template
> (centos_65_64bits)
> > > 1.1 configuration : I do not select stateless checkbox
> > > 1.2 this process takes a 1h30 to create each machine.
> > >
> > > 2) on tab pools > new vm > template (centos_65_64bits)
> > > 2.1 default configuration : stateless
> > > 2.2 Here I created 3 virtual machines at once
> > > 2.3 this process takes only one minute
> > >
> > > On the tab virtual machines I can see all virtual
> machines.
> > > Pooled machines have different icon image
> > > and description is different too:
> > >
> > > machines generated from tab VM are described as
> clone/dependent
> > > - clone is a phisical copy?
> > > machines generated from tab POOL are described as
> thin/independent
> > > - thin is a just a reference to template vm ? what is
> phisical? any configuration file?
> >
> > yeah, sort of.
> > just google thin provisioning in general:)
> >
> >
> > >
> > >
> > > In practice, what is the difference between these
> machines ?
> > >
> > >
> > >
> > >
> > > http://www.ovirt.org/Features/PrestartedVm
> > > "Today there are 2 types of Vm pools:
> > > • Manual - the Vm is supposed to be manually returned
> to the
> pool. In practice, this is not really entirely supported.
> > > • Automatic - once the user shuts down the Vm - it
> returns to
> the pool (stateless)."
> > >
> > > all vm created from pool are stateless ?
> >
> > the automatic pool, yes
> >
> > Thanks,
> > michal
> >
> > >
> > >
> > > thanks
> > >
> > >
> > >
> > > _______________________________________________
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> > > Users at ovirt.org <mailto:Users at ovirt.org>
> <mailto:Users at ovirt.org <mailto:Users at ovirt.org>>
> > > http://lists.ovirt.org/mailman/listinfo/users
>
> >
> >
>
>
>
>
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> --
> Dafna Ron
>
>
--
Dafna Ron
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