[one-users] datastore and san disks

[Tino Vazquez]

Hi,

comments inline,

On Mon, Jul 1, 2013 at 9:28 PM, Michael Curran
<michael.curran at connectsolutions.com> wrote:
> Even though the each hosts already see them as SAN disks, they need to be
> mounted like nfs volumes on each EACh host because of the method for
> OpenNebula?

No, for datastores mounted as iSCSI in the ESX you can use the
OpenNebula vmfs drivers
(http://opennebula.org/documentation:rel4.0:vmware_ds#using_vmfs_datastores).
For datastores mounted through NFS in the ESX you can use the
OpenNebula shared drivers
(http://opennebula.org/documentation:rel4.0:vmware_ds#using_nfs_datastores).
But you don't need to mount each disk twice.

>
> And each time we add new SAN disks, we just add another link to each ESX
> host?

You need to add the disk to each ESX in the same OpenNebula cluster,
or just in the ESX hosts where you chose to. In the latter, you need
to be careful with the VM templates REQUIREMENTS section so they don't
end up in a host that doesn't present the datastores where the images
that conform the VM reside. The idea of the former, grouping the ESX
with the same datastores in the same cluster, is to avoid having to
deal with this extra configuration. You can have different clusters
with different datastores mounted, and when you decide to add another
disk, you will need to add it to each ESX in the cluster, but not to
the ESX of other clusters.

Hope it helps,

-Tino

>
>
>
>
>
> Sent from my Android phone using TouchDown (www.nitrodesk.com)
>
>
> -----Original Message-----
> From: Tino Vazquez [cvazquez at c12g.com]
> Received: Monday, 01 Jul 2013, 12:27pm
> To: Michael Curran [michael.curran at connectsolutions.com]
> CC: users at lists.opennebula.org [users at lists.opennebula.org]
> Subject: Re: [one-users] datastore and san disks
>
> Hi Michael,
>
>> Treating the env. as SAN disks, I don’t need a datastore on the OpenNebula
>> VM? I just need to share a volume of some sorts on the ESXi hosts? Im not
>> getting this clearly
>
> That is correct, for the configuration you are describing you will
> need to use the OpenNebula datastore and transfer VMFS drivers.
>
>   * The datastore drivers are in charge of staging images from
> different sources to the images datastore.
>   * The transfer drivers deals with moving the images from the images
> datastores to the system datastore (where the running VM images are
> stored).
>
> In particular, the datastore VMFS drivers have one attribute
> (BRDIGE_LIST) that describes the ESXs to act as gateways to stage the
> images in images datastores (they will be picked in a round robin
> fashion). For this reason, the OpenNebula front-end doesn't need to
> mount any datastores (plus, it would be tricky to manage a VMFS volume
> from a linux distribution).
>
>> And it also reads like my SAN disks should be specifically assigned to
>> each ESXi hosts – our production env. has 100’s of SAN disks and they are
>> shared to all ESXi hosts – that seems  a bit strange
>
> You need to mount in each host all the datastores where you store
> images that you want to run VMs from in that particular host. That is,
> if you have 100 different disks you can have a 100 different images
> datastores. You can chose to mount all 100 in all your ESX hosts, or
> you can group the ESX hosts that are going to share certain images
> datastores in the same cluster. OpenNebula will deduce from the VM
> definition in which cluster that VM should be placed, so the images
> that conform the VM can be pulled from the images datastores that hold
> them.
>
> I hope the above clarifies your questions. If they don't, please come
> back with your doubts and we will do our best to clarify them.
>
> Regards,
>
> -Tino
> --
> Constantino Vázquez Blanco, PhD, MSc
> C12G Labs - OpenNebula for the Enterprise
> www.c12g.com | cvazquez at c12g.com | @C12G
>
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>
> On Mon, Jul 1, 2013 at 2:42 PM, Michael Curran
> <michael.curran at connectsolutions.com> wrote:
>> Hello ---
>>
>>
>>
>> I am working through setting up a test environment for OpenNebula , and
>> most
>> of it has been exceptionally straight-forward and simple. However, working
>> through the datastore assignment has been a bit tricky, because the
>> documentation reads as if all the SAN has to be assigned to specific nodes
>> within the configuration, and it is shared to all nodes.
>>
>>
>>
>> I am using vmware esxi 5.1 for testing and we have a rather robust VMware
>> environment already, and are looking to leverage OpenNebula to improve our
>> ability to stand up new VMs with less user interaction and speeding up the
>> process with the tasks that OpenNebula can easily help automate and
>> improve
>>
>>
>>
>> My test environment has the following
>>
>>
>>
>> 1)      OpenNebula VM for management
>>
>> 2)      2 ESXi 5.1 hosts
>>
>> 3)      3 Datastores shared to both nodes as iSCSI attached devices
>>
>>
>>
>> Treating the env. as SAN disks, I don’t need a datastore on the OpenNebula
>> VM? I just need to share a volume of some sorts on the ESXi hosts? Im not
>> getting this clearly
>>
>>
>>
>> And it also reads like my SAN disks should be specifically assigned to
>> each
>> ESXi hosts – our production env. has 100’s of SAN disks and they are
>> shared
>> to all ESXi hosts – that seems  a bit strange
>>
>>
>>
>> Could someone help me understand what I am missing here so I can complete
>> the build of my test env.?
>>
>>
>>
>> Michael Curran | connectsolutions | Lead Network Architect
>>
>> Phone 614.568.2285 | Mobile 614.403.6320 | www.connectsolutions.com
>>
>>
>>
>>
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>>