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Thanks Jay!

So I guess if one wants to use the iSCSI gateway with Ironic now, one would have to use the 'external' storage interface available since Rocky and do the poking of Ceph out of band. That won't really work for our use case, but perhaps others could take advantage.

I'm very grateful that the Cinder team is spending time on this!

Cheers,
/Jason
________________________________
From: Jay Bryant <jungleboyj at gmail.com>
Sent: Wednesday, May 8, 2019 11:21
To: openstack-discuss at lists.openstack.org
Subject: Re: topic: ironic boot from cinder volume(the cinder volume backend is ceph storage)


Jason,

You are correct.  The plan is to add a driver that will use the iSCSI gateway to make volumes available instead of using RBD commands.  So, the driver will be heavily based on the existing RBD driver but do the export via iSCSI gateway.

Unfortunately, the iSCSI Gateway CLI is not well suited to remote execution so we have Walt Boring looking into better ways of interacting with the gateway or possibly updating the client to support our needs.

If you want to see additional notes on the topic see our discussion from the PTG last week at around line 119.  [1]

Thanks!
Jay

[1] https://etherpad.openstack.org/p/cinder-train-ptg-planning

On 5/8/2019 11:14 AM, Jason Anderson wrote:
Tim, Jay --

I looked in to this recently as it was a use-case some of our HPC users wanted support for. I noticed that Ceph has the iSCSI gateway, but my impression was that this wouldn't work without adding some sort of new driver in Cinder. Is that not true? I thought that Cinder only Ceph via RBD. I'd be happy to be proven wrong on this.

Cheers,
/Jason
________________________________
From: Jay Bryant <jungleboyj at gmail.com><mailto:jungleboyj at gmail.com>
Sent: Wednesday, May 8, 2019 11:04
To: openstack-discuss at lists.openstack.org<mailto:openstack-discuss at lists.openstack.org>
Subject: Re: topic: ironic boot from cinder volume(the cinder volume backend is ceph storage)

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