[stein][manila] share migration misconfiguration ?

Ignazio Cassano ignaziocassano at gmail.com
Fri Feb 5 11:16:17 UTC 2021

Hello, thanks for your help.
I am waiting my storage administrators have a window to help me because
they must setup the snapmirror.
Meanwhile I am trying the host assisted migration but it does not work.
The share remains in migrating for ever.
I am sure the replication-dr works because I tested it one year ago.
I had an openstack on site A with a netapp storage
I had another openstack on Site B with another  netapp storage.
The two openstack installation did not share anything.
So I made a replication between two volumes (shares).
I demoted the source share taking note about its export location list
I managed the destination on openstack and it worked.

The process for replication is not fully handled by openstack api, so  I
should call netapp api for creating snapmirror relationship or ansible
modules or ask help to my storage administrators , right ?
Instead, using share migration, I could use only openstack api: I
understood that driver assisted cannot work in this case, but host assisted
should work.

Best Regards

Il giorno gio 4 feb 2021 alle ore 21:39 Douglas <viroel at gmail.com> ha

> Hi Rodrigo,
> Thanks for your help on this. We were helping Ignazio in #openstack-manila
> channel. He wants to migrate a share across ONTAP clusters, which isn't
> supported in the current implementation of the driver-assisted-migration
> with NetApp driver. So, instead of using migration methods, we suggested
> using share-replication to create a copy in the destination, which will use
> the storage technologies to copy the data faster. Ignazio didn't try that
> out yet, since it was late in his timezone. We should continue tomorrow or
> in the next few days.
> Best regards,
> On Thu, Feb 4, 2021 at 5:14 PM Rodrigo Barbieri <
> rodrigo.barbieri2010 at gmail.com> wrote:
>> Hello Ignazio,
>> If you are attempting to migrate between 2 NetApp backends, then you
>> shouldn't need to worry about correctly setting the data_node_access_ip.
>> Your ideal migration scenario is a driver-assisted-migration, since it is
>> between 2 NetApp backends. If that fails due to misconfiguration, it will
>> fallback to a host-assisted migration, which will use the
>> data_node_access_ip and the host will attempt to mount both shares. This is
>> not what you want for this scenario, as this is useful for different
>> backends, not your case.
>> if you specify "manila migration-start --preserve-metadata True" it will
>> prevent the fallback to host-assisted, so it is easier for you to narrow
>> down the issue with the host-assisted migration out of the way.
>> I used to be familiar with the NetApp driver set up to review your case,
>> however that was a long time ago. I believe the current NetApp driver
>> maintainers will be able to more accurately review your case and spot the
>> problem.
>> If you could share some info about your scenario such as:
>> 1) the 2 backends config groups in manila.conf (sanitized, without
>> passwords)
>> 2) a "manila show" of the share you are trying to migrate (sanitized if
>> needed)
>> 3) the "manila migration-start" command you are using and its parameters.
>> Regards,
>> On Thu, Feb 4, 2021 at 2:06 PM Ignazio Cassano <ignaziocassano at gmail.com>
>> wrote:
>>> Hello All,
>>> I am trying to migrate a share between a netapp backend to another.
>>> Both backends are configured in my manila.conf.
>>> I am able to create share on both, but I am not able to migrate share
>>> between them.
>>> I am using DSSH=False.
>>> I did not understand how host and driver assisted migration work and
>>> what  "data_node_access_ip" means.
>>> The share I want to migrate is on a network ( that I
>>> can reach by my management controllers network ( I Can
>>> mount share from my controllers and I can mount also the netapp SVM where
>>> the share is located.
>>> So in the data_node_access_ip I wrote the list of my controllers
>>> management ips.
>>> During the migrate phase I checked if my controller where manila is
>>> running mounts the share or the netapp SVM but It does not happen.
>>> Please, what is my mistake ?
>>> Thanks
>>> Ignazio
>> --
>> Rodrigo Barbieri
>> MSc Computer Scientist
>> OpenStack Manila Core Contributor
>> Federal University of São Carlos
> --
> Douglas Salles Viroel
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