[one-users] iSCSI recipe

[Ruben S. Montero]

Hi

For live-migrations the supported procedure is the libvirt hook, note that
live migrations requires a close synchronization between the image
movements, memory movements and the hypervisors. OpenNebula cannot perform
the login/logout from the iSCSI sessions there. Cold migrations are handled
by opennebula as part of the save and restore commands.

Cheers

Ruben

On Sun, Aug 12, 2012 at 4:41 AM, Gary S. Cuozzo <gary at isgsoftware.net>wrote:

> Hello,
>
>
>>
>> * Each host needs to attach to all iSCSI targets that are needed by
>> guests running on the host. It's not entirely clear to me if ONE handles
>> all that or not (assuming it does).
>>
>> ONE handles this by login/logout in an iSCSI session as needed
>>
>> My iSCSI setup uses a target for each virtual server, and multiple LUN's
> per target (if the server has multiple disks).  I developed a custom driver
> for it.  I don't know if I have a shortcoming in my driver, or maybe a
> config issue on ONE, but I found that ONE did NOT handle the login/logout
> on the host machines.  It was fine for the initial setup & deployment of
> the vm, but live migrations did not cause my driver to initiate a login on
> the receiving host and a logout on the transferring host.
>
> I ended up having to write a libvirt hook which scanned for new targets to
> log them in.  It also rescanned all current targets to check if they had
> new LUN's attached to them.  It works well and my vm's migrate just fine,
> but I would prefer to have all this handled within ONE.
>
> What is the script that ONE calls in order to initiate the logins/logouts
> as vm's migrate?
>
> Cheers,
> gary
>
>
>
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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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