[openstack-dev] [Manila] Network path between admin network and shares

Sturdevant, Mark mark.sturdevant at hp.com
Tue Jun 16 18:29:34 UTC 2015

Yes.  I think this is possible with the HP 3PAR.  I'd have to test more to be sure, but if I understand the plan correctly, it'll work.  However, there are limited resources for doing this, so it'll only work if resources allow.  I'm thinking that the administrator config+startup/setup code would setup admin network access and hold those resources to make sure that migration is possible.

I could see a scenario where a backend is usable for shares, but can't spare the extra resources to allow migration.  That could be a problem.  I'm not sure how/if we'd support that.

From: Rodrigo Barbieri [rodrigo.barbieri2010 at gmail.com]
Sent: Thursday, June 11, 2015 1:52 PM
To: OpenStack Development Mailing List (not for usage questions)
Subject: [openstack-dev] [Manila] Network path between admin network and shares

Hello all,

There has been a lot of discussion around Share Migration lately. This feature has two main code paths:

- Driver Migration: optimized migration of shares from backend A to backend B where both backends belong to the same driver vendor. The driver is responsible for migrating and just returns a model update dictionary with necessary changes to DB entry.

- Generic Migration: This is the universal fallback for migrating a share from backend A to backend B, from any vendor to any vendor. In order to do this we have the approach where a machine in the admin network mounts both shares (source and destination) and copy the files. The problem is that it has been unusual so far in Manila design for a machine in the admin network to access shares which are served inside the cloud, a network path must exist for this to happen.

I was able to code this change for the generic driver in the Share Migration prototype (https://review.openstack.org/#/c/179791/).

We are not sure if all driver vendors are able to accomplish this. We would like to ask you to reply to this email if you are not able (or even not sure) to create a network path from your backend to the admin network so we can better think on the feasability of this feature.

More information in blueprint: https://blueprints.launchpad.net/manila/+spec/share-migration

Rodrigo Barbieri
Computer Scientist
Federal University of São Carlos
+55 (11) 96889 3412

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