[one-users] infiniband

[Chris Barry]

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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