[one-users] infiniband

Mon May 7 10:42:43 PDT 2012

Sure, where and how do I do it? I noticed that you have a community wiki
site. Do i upload the driver and make an entry there?

Shankhadeep

On Mon, May 7, 2012 at 11:54 AM, Jaime Melis <jmelis at opennebula.org> wrote:

> Hello Shankhadeep,
>
> that sounds really nice. Would you be interested in contributing your code
> to OpenNebula's ecosystem and/or publishing an entry in opennebula's blog?
>
> Regards,
> Jaime
>
>
> On Sun, May 6, 2012 at 5:39 AM, Shankhadeep Shome <shank15217 at gmail.com>wrote:
>
>>
>>
>> On Sat, May 5, 2012 at 11:38 PM, Shankhadeep Shome <shank15217 at gmail.com>wrote:
>>
>>> Hi Chris
>>>
>>> We have a solution we are using on Oracle Exalogic hardware (we are
>>> using the bare metal boxes and gateway switches). I think I understand the
>>> requirement, IB accessible storage from VMs is possible however its a bit
>>> convoluted. Our solution was to create a one-to-one NAT from the VMs to the
>>> IB IPoIB network. This allows the VMs to mount storage natively over the IB
>>> network. The performance is pretty good, about 9Gbps per node with 64k MTU
>>> sizes.  We created an open nebula driver for this and I'm happy to share it
>>> with the community. The driver handles VM migrations by enabling/diabling
>>> ip aliases on the host and can also be used to manipulate iptable rules on
>>> source and destination when open nebula moves VMs around.
>>>
>>> Shankhadeep
>>>
>>>
>>> On Sat, May 5, 2012 at 5:42 PM, Chris Barry <cbarry at rjmetrics.com>wrote:
>>>
>>>> Reading more, I see that the available methods for block store are
>>>> iSCSI, and that the LUNS are attached to the host. From there, a symlink
>>>> tree exposes the target to the guest in a predictable way on every host.
>>>>
>>>> So then to modify my question a bit, are all LUNs attached to all hosts
>>>> simultaneously? Or does the attachment only happen when a migration is to
>>>> occur? Also, is the LUN put into a read-only mode or something during
>>>> migration on the original host to protect the data? Or, must a clustering
>>>> filesystem be employed?
>>>>
>>>> Guess I have a lot to read :)
>>>>
>>>> Thanks
>>>> -C
>>>>
>>>>
>>>> On Sat, May 5, 2012 at 5:23 PM, Chris Barry <cbarry at rjmetrics.com>wrote:
>>>>
>>>>> Hi Gubda,
>>>>>
>>>>> Thank you for replying. My goal was to use a single shared iso image
>>>>> to boot from, and use an in-memory minimal linux on each node that had no
>>>>> 'disk' at all, then to mount logical data volume(s) from a centralized
>>>>> storage system. Perhaps that is outside the scope of opennebula's design
>>>>> goals, and may not be possible  - I'm just now investigating it.
>>>>>
>>>>> I see you are using NFS, but my desire is to use block storage
>>>>> instead, ideally LVM, and not incur the performance penalties of IPoIB. It
>>>>> does sound simple though, and that's always good. Do you have any
>>>>> performance data on that setup in terms of IOPs and/or MB/s write speeds?
>>>>> It does sound interesting.
>>>>>
>>>>> Thanks again,
>>>>> -C
>>>>>
>>>>>
>>>>> On Sat, May 5, 2012 at 4:01 PM, Guba Sándor <gubasanyi at gmail.com>wrote:
>>>>>
>>>>>>  Hi
>>>>>>
>>>>>> I'm using InfiniBand to make shared storage. My setup is simple: the
>>>>>> opennebula installdir is shared on NFS with the worker nodes.
>>>>>>
>>>>>> - I don't understand what you mean on shared image. There will be a
>>>>>> copy (or symlink if the image is persistent) on the NFS host and that is
>>>>>> that the hypervisor will use over the network. Live migrate is available
>>>>>> beacuse you don't move the image only another host will use it from the
>>>>>> same spot. With my linux images I have about 30s delay when livemigrate.
>>>>>> You can use qcow2 driver for shared image.
>>>>>>
>>>>>> - I don't understant exactly what you mean on "guest unaware". If you
>>>>>> mean storage - host connection it has nothing to do with nebula. You can
>>>>>> use any shared filesystem. NFS uses IPoIB connection.
>>>>>>
>>>>>> 2012-05-05 19:01 keltezéssel, Chris Barry írta:
>>>>>>
>>>>>> Greetings,
>>>>>>
>>>>>> I'm interested in hearing user accounts about using infiniband as the
>>>>>> storage interconnect with OpenNebula if anyone has any thoughts to share.
>>>>>> Specifically about:
>>>>>> * using a shared image and live migrating it (e.g. no copying of
>>>>>> images).
>>>>>> * is the guest unaware of the infiniband or is it running IB drivers?
>>>>>> * does the host expose the volumes to the guest, or does the guest
>>>>>> connect directly?
>>>>>> * I'd like to avoid iSCSI over IPoIB if possible.
>>>>>> * clustering filesystem/LVM requirements.
>>>>>> * file-based vdisk or logical volume usage?
>>>>>>
>>>>>> Anything, an experiences at all will be helpful.
>>>>>>
>>>>>> Thanks
>>>>>> Christopher
>>>>>>
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
>>>>>>
>>>>>>
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>>>>>>
>>>>>
>>>>
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>>>
>>
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>
>
> --
> Jaime Melis
> Project Engineer
> OpenNebula - The Open Source Toolkit for Cloud Computing
> www.OpenNebula.org | jmelis at opennebula.org
>
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