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

Wed Apr 23 12:59:31 UTC 2014

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