[one-users] Image Manager and Transfer Manager drivers

[Humberto N. Castejon Martinez]

Thanks Ruben for your answer (you answered while I was typing my last
email, so please, forget it)

With the Image Driver everything is clear now, but not so with the Transfer
Driver, so I hope you can help me a little bit more. Have in mind that I am
developing drivers for a ZFS-based shared storage solution.
In the documentation I can read that the mkimage and mkswap commands
respectively create empty and swap images in <destination>. I assume
<destination> will be a worker, so it will be a path of the form
<VM_DIR>/<VM_ID>/images/<filename>. Is that right? And in which situations
will these commands actually be used? Is tm_clone not used to copy empty
images from the repository to the VM_DIR?
You say that tm_mv is used to move the images from the host to the VM_DIR
at the front-end. What is this needed for (i.e. in which situation is
executed)? Is this command needed if the VM_DIR is shared between the
front-end and the workers? (I would say no)

Thanks again.

Cheers,
Humberto





On Mon, Nov 14, 2011 at 10:23 AM, Ruben S. Montero <rsmontero at opennebula.org
> wrote:

> Hi,
>
> Basically you have to storage areas:
>
> * The image repository, where your base images are kept. Any operation
> to copy or move an image from there are through the Image driver. This
> is for: 1) Resitering a new image (CP) 2) Creating an empty image
> (MKFS) 3) Copy back a persistent image or a saved_as one (MV)  and 4)
> delete an image (RM)
>
> * The storage at the hosts and the VM_DIR (can be local or in a shared
> FS). Transfer operations to/from that directories are handle with the
> TM. TM move is then used to move the images from the host to the
> VM_DIR at the front-end.
>
> Cheers
>
> Ruben
>
> On Wed, Nov 9, 2011 at 3:08 PM, Humberto N. Castejon Martinez
> <humcasma at gmail.com> wrote:
> > Hi,
> >
> > I have two questions regarding some of the commands in these two sets of
> > drivers.
> > When is the IM's mkfs command used and when the TM's mkimage command ?
> > When (for what) is the   IM's mv command used? (I understand the TM's mv
> > command is used to move the image used by a running VM back to the
> > repository, right?)
> > Thanks.
> > Cheers,
> > Humberto
> > _______________________________________________
> > Users mailing list
> > Users at lists.opennebula.org
> > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
> >
> >
>
> --
> Ruben S. Montero, PhD
> Project co-Lead and Chief Architect
> OpenNebula - The Open Source Toolkit for Data Center Virtualization
> www.OpenNebula.org | rsmontero at opennebula.org | @OpenNebula
>
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