[one-users] Open Nebula, NFS and requirements of disk space?

[Anders Branderud]

Hello to you all,
This is another question about requirements of disk space for a Open Nebula
installation using NFS.

Steffen, Thanks for your reply!

What you wrote is what I could derive from the text.

However, I would like to know of why 15*10GB=150GB on the frontend is
required for running 15 virtual machines with NFS.
The VM's will run on the worker nodes.

I don't understand the technical reasons behind that there, according to
this quote, needs to be one clone per running VM?:
"A 64 core cluster will typically run around 80VMs, each VM will require an
average of 10GB of disk space. So you will need ~800GB for /srv/cloud/one
(..) /srv/cloud/one, will hold the OpenNebula installation and the clones
for the running VMs"" Can anyone explain?

Is there any way to configure so that the VM's doesn't require any clone in
srv/cloud/one, but only runs on the worker nodes?

If that was possible then the below computer specifications (that I
specified in my last e-mail) would be enough!
I hope to be able to run a system with up to 15 VM's and 2 Master images (in
total) using NFS with 16 computers with 36 GB each.

Thanks in advance!

Kind Regards, Anders Branderud

[Personal blog] bloganders.blogspot.com  : Logical reasons - based on
scientific premises - for the existence of a Creator and that He hasn't left
His sapient creatures without an Instruction Manual - Torah ['books of
Moses'] - to ascertain, and aspire to, His purpose.

[Company] Anders Branderud IT Solutions - www.abitsolutions.org

2011/5/13 Neumann, Steffen <sneumann at ipb-halle.de>

>  Hi,
>
> seems you have already done some reading,
> so here is only very brief comments which might
> help you understand things for second reading:
>
> If you don't have an NFS filesystem with (at least)
> 15*10GB=150GB, you can't do the NFS installation.
>
> In your case, you want to copy the images to the local disks
> of the worker nodes, so you want "Non-Shared - SSH" described on:
> http://opennebula.org/documentation:rel2.2:sm
>
> Yours,
> Steffen
>
>  ------------------------------
> *From:* users-bounces at lists.opennebula.org [
> users-bounces at lists.opennebula.org] on behalf of Anders Branderud [
> anders.branderud at gmail.com]
> *Sent:* 13 May 2011 15:17
> *To:* users at lists.opennebula.org
> *Subject:* [one-users] Open Nebula, NFS and requirements of disk space?
>
>   Hello!
>  I have read this information about required disk space for installing
> Open Nebula:
>
> "*Example*: A 64 core cluster will typically run around 80VMs, each VM
> will require an average of 10GB of disk space. So you will need ~800GB for
> /srv/cloud/one, you will also want to store 10-15 master images so ~200GB
> for /srv/cloud/images. A 1TB /srv/cloud will be enough for this ex"
>
>  Here is my question: I have 16 computers and each of them has a harddrive
> of 36 GB each.
>  Will the disk space suffice for this? [This is how I plan to configure
> the system:]
>  There are only two master images (i.e. approx. 20 GB).
>  There can be between 1 and 15 virtual machines. The virtual machines run
> on the worker nodes of Open Nebula.
>  The master images are not cloned and they are not stored when the regular
> user is finished with his/her session.
>
>  I understand that it won't work if this is necessary: "/srv/cloud/one,
> will hold the OpenNebula installation and the clones for the running VMs".
>  How do I configure the system to not clone the running VM's, but to only
> to run them on the worker nodes?
>
>  If the disk space suffices, then how do I configure the system to
> accomplish the above requirements?
>  I plan to install the system on CentOS, using the express installation
> (for NFS) provided on Open Nebula's website.
>
>  Thanks!
>
> -- Kind Regards, Anders Branderud
>
> [Personal blog] bloganders.blogspot.com  : Logical reasons - based on
> scientific premises - for the existence of a Creator and that He hasn't left
> His sapient creatures without an Instruction Manual - Torah ['books of
> Moses'] - to ascertain, and aspire to, His purpose.
>
> [Company] Anders Branderud IT Solutions - www.abitsolutions.org
>
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