[one-users] Storage architecture question

Tue Jul 31 14:44:39 PDT 2012

Hi,

You can set the Images Datastore of type FS to use the shared TM and your
fast NAS, but the system datastore to use the ssh drivers. This  will copy
the images from the Datastore which uses NFS to the local storage area.

Note 1: This will only work for non-persistent images. Persistent images
will be linked and thus used directly from the NAS server.

Note 2: you cannot mix both setups in the same cluster. This is, if your
system datastore is shared the ssh transfer will copy the images to the NFS
volume in the remote host.

You can:

1.- Create a dedicated cluster for this images that uses ssh as the system
datastore (so the hosts do not mount the NFS export). You just need to add
a few host and the datastore of the high demaning I/O images.The 3.6
scheduler will only use the resources of that cluster for that VMs [2]

2.- Modify the clone/mv/mvds scripts from a TM shared so it copy some of
your images to a local disk and link them to the path expected by
OpenNebula.

Cheers

Ruben

[1]
http://opennebula.org/documentation:rel3.6:system_ds#using_the_ssh_transfer_driver

[2]http://opennebula.org/documentation:rel3.6:cluster_guide

On Mon, Jul 30, 2012 at 7:36 PM, Gary S. Cuozzo <gary at isgsoftware.net>wrote:

> Hi Tino,
> Thanks for the reply.
>
> Yes, I think you understand correctly.  My goal is to be able to utilize
> storage which is local to a particular vm host node without incurring the
> overhead of duplicated storage on the controller node and transfer time
> from controller to vm host.
>
> I do understand that the images will only be accessible from the
> particular vm host which they reside on, but that is ok as it would be the
> trade-off for local disk performance.  I have a great iSCSI/NFS SAN which
> is used for shared storage, but it will never be able to offer the same
> level of performance as local storage.  So I'm looking to be able to have
> that local option for the few cases it's required for I/O intensive
> applications.
>
> I have not actually had the chance to try it out yet, but I think it will
> give me what I'm looking for.
>
> Thanks again,
> gary
>
>
> ----- Original Message -----
> From: "Tino Vazquez" <tinova at opennebula.org>
> To: "Gary S. Cuozzo" <gary at isgsoftware.net>
> Cc: users at lists.opennebula.org
> Sent: Monday, July 30, 2012 12:40:06 PM
> Subject: Re: [one-users] Storage architecture question
>
> Dear Gary,
>
> I am not sure I understand 100% your desired set-up, but if I grasped
> it correctly, I think the problem you may found is the images would
> only be local to the node that is exporting the NFS share. Otherwise I
> think it will work as you expect.
>
> Regards,
>
> -Tino
>
> --
> Constantino Vázquez Blanco, MSc
> Project Engineer
> OpenNebula - The Open-Source Solution for Data Center Virtualization
> www.OpenNebula.org | @tinova79 | @OpenNebula
>
>
> On Fri, Jul 27, 2012 at 11:44 PM, Gary S. Cuozzo <gary at isgsoftware.net>
> wrote:
> > Hi Users,
> > I am running ONE 3.6 and would like to be able to run a combination of
> > shared storage (via iSCSI) and local storage (to take advantage of local
> > disk performance for certain applications).  My question is related to
> the
> > local storage aspect.
> >
> > From what I've seen, I can use a local datastore and the ssh TM to
> > accomplish local storage.  The drawback that I see is that I need 2x the
> > amount of disk space because I need storage for the permanent image on
> the
> > controller node, then storage on the local host for the running image
> when
> > it is deployed.  A secondary issue for me is that the images have to be
> > transferred between the datastore and the host machine, which will take
> some
> > time with larger images.
> >
> > To get around the problem, I thought I could set the datastore up as a
> > shared filesystem, except the sharing would actually be from the host
> > machine to the controller machine via NFS.  Is there any particular
> > reason(s) that would be a bad idea?  On the surface it seems like it
> should
> > work just fine, but I'm somewhat new to ONE and want to be sure I'm not
> > going down a bad path since I plan to do this with several host machines.
> >
> > Thanks in advance for any advice.
> >
> > gary
> >
> >
> > _______________________________________________
> > Users mailing list
> > Users at lists.opennebula.org
> > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
> >
> _______________________________________________
> Users mailing list
> Users at lists.opennebula.org
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>
> --
> Ruben S. Montero, PhD
> Project co-Lead and Chief Architect
> OpenNebula - The Open Source Solution for Data Center Virtualization
> <http://lists.opennebula.org/listinfo.cgi/users-opennebula.org>
> www.OpenNebula.org | rsmontero at opennebula.org | @OpenNebula
>
>
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