[stein][manila] share migration misconfiguration ?

Douglas viroel at gmail.com
Thu Feb 4 20:39:11 UTC 2021

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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