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

Tamer.americo tamer.americo at gmail.com
Wed Apr 23 10:09:28 EDT 2014


hi,

no. is not hosted engine.

on server 01 I installed ovirt engine , vdsm, libvirt, postgres , etc using engine-setup .  In this machine I have 3 VMs, all running centos65

this server 01 has ovirt web admin (jboss) and there I see all hosts ( server 01, 02 and 03) on the cluster. I can create and manage VM (thin and cloned) 




tamer


Em 23/04/2014, às 10:21, Dafna Ron <dron at redhat.com> escreveu:

> 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
>>            > >
>>            > >
>>            > >
>>            > > _______________________________________________
>>            > > Users mailing list
>>            > > 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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