[one-users] Storage architecture question

Thu Aug 16 23:43:28 PDT 2012

Hello Gary,

that sounds great. We would like to take a look at them in order to see how
useful it will be to have them directly in OpenNebula. Could you upload
them some where, for instance github?

Cheers,
Jaime

On Thu, Aug 16, 2012 at 1:53 PM, Gary S. Cuozzo <gary at isgsoftware.net>wrote:

> Hi Jaime,
> Yes, I thought of contributing the drivers already and would be happy to
> do so.  My scripts are sort of "brute forced" and not as elegant as the ONE
> drivers, but I'm sure they can be cleaned up pretty easily.  My goal at the
> time was to test out a theory.  I'm sure there are improvements for error
> checking & other things that can be made.
>
> Let me know the best way to contribute.  If somebody from ONE were to
> review the scripts and suggest changes, I'm happy to work with them to make
> them better.
>
> Thanks,
> gary
>
>
> ------------------------------
> *From: *"Jaime Melis" <jmelis at opennebula.org>
>
> *To: *"Gary S. Cuozzo" <gary at isgsoftware.net>
> *Cc: *users at lists.opennebula.org
> *Sent: *Thursday, August 16, 2012 7:23:41 AM
>
> *Subject: *Re: [one-users] Storage architecture question
>
> Hi Gary,
>
> sounds great, could you contribute the code at some point?
>
> cheers,
> Jaime
>
> On Mon, Aug 6, 2012 at 2:52 PM, Gary S. Cuozzo <gary at isgsoftware.net>wrote:
>
>> Here's an update on this thread...
>>
>> So I did originally setup a "local" datastore by using NFS from the host
>> to the controller as a shared DS.  It worked fine and performed as
>> expected.  I was able to get the speed of local storage without having
>> bloated capacity requirements and delays in deployment due to having large
>> images be copied across the network.  I also tested rebooting the
>> controller node and the host node and the NFS share would come back up
>> reliably.
>>
>> Having to setup the NFS share was the main drawback.  I figured I could
>> get around that by writing a custom DS/TS driver.  That is the route I
>> took.  Over the weekend I created a 'localfs' set of drivers and they seem
>> to work great and don't require me to setup the NFS share.  This seems to
>> give me exactly what I was looking for.
>>
>> The only requirement for my driver is that I create the datastore first
>> so that I can get the ID.  Then, I mount my local disks (I use an LVM
>> volume) at the correct mount point according to the DS ID.
>>
>> I use a DS template variable to specify the hostname of the host so that
>> I can use the driver on multiple hosts.  The images get created as
>> hostname:/path/to/image.
>>
>> So far so good.
>>
>> Just FYI,
>> gary
>>
>>
>> ------------------------------
>> *From: *"Ruben S. Montero" <rsmontero at opennebula.org>
>>
>> *To: *"Gary S. Cuozzo" <gary at isgsoftware.net>
>> *Sent: *Thursday, August 2, 2012 12:46:28 PM
>>
>> *Subject: *Re: [one-users] Storage architecture question
>>
>> OK, keep us updated with the performance of your final solution
>>
>>
>> Good Luck
>>
>> Ruben
>>
>> On Thu, Aug 2, 2012 at 5:58 PM, Gary S. Cuozzo <gary at isgsoftware.net>wrote:
>>
>>> Hi Ruben,
>>> Thank you for the reply & information.
>>>
>>> I had previously thought about a similar setup to what you have
>>> outlined.  One drawback I was trying to work around is that I will be
>>> duplicating storage requirement as I will have to store images on both my
>>> SAN/NAS and the local system.  As my SAN/NAS is fully mirrored, I will
>>> actually incur a fairly substantial increase in the overhead per GB.  I was
>>> trying to avoid that.
>>>
>>> My other main concern was time to copy the image files to/from the
>>> hosts.  A few of the images will be TB's and the copies will take a long
>>> time I think, even over GB links.
>>>
>>> I do intend to create a separate cluster and datastore for these few
>>> hosts.  I'll just have to try out a few different setups and see what works
>>> best.
>>>
>>> You guys have given me some good ideas, thank you.
>>>
>>> gary
>>>
>>> ------------------------------
>>> *From: *"Ruben S. Montero" <rsmontero at opennebula.org>
>>>
>>> *To: *"Gary S. Cuozzo" <gary at isgsoftware.net>
>>> *Cc: *users at lists.opennebula.org
>>> *Sent: *Tuesday, July 31, 2012 5:44:39 PM
>>>
>>> *Subject: *Re: [one-users] Storage architecture question
>>>
>>> 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
>>>> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>>>
>>>> --
>>>> 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
>>>>
>>>>
>>>
>>
>>
>> --
>> Ruben S. Montero, PhD
>> Project co-Lead and Chief Architect
>> OpenNebula - The Open Source Solution for Data Center Virtualization
>> www.OpenNebula.org | rsmontero at opennebula.org | @OpenNebula
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users at lists.opennebula.org
>> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>
>>
>
>
> --
> Jaime Melis
> Project Engineer
> OpenNebula - The Open Source Toolkit for Cloud Computing
> www.OpenNebula.org | jmelis at opennebula.org
>
>
> _______________________________________________
> Users mailing list
> Users at lists.opennebula.org
> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>
>

-- 
Jaime Melis
Project Engineer
OpenNebula - The Open Source Toolkit for Cloud Computing
www.OpenNebula.org | jmelis at opennebula.org
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