[ovirt-users] difference between thin/depentend and clone/dependent vm virtual machine

[Tamer Lima]

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> wrote:

>
> On Apr 17, 2014, at 16:43 , Tamer Lima <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> wrote:
> >
> > On Apr 16, 2014, at 16:41 , Tamer Lima <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
> > >
> > >
> > >
> > > _______________________________________________
> > > Users mailing list
> > > Users at ovirt.org
> > > http://lists.ovirt.org/mailman/listinfo/users
> >
> >
>
>
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